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Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

RivDIS Project Page  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

River Discharge (RivDis) River Discharge (RivDis) The Global River Discharge (RivDIS) Project Overview The Global River Discharge (RivDIS) data set contains monthly discharge measurements for 1018 stations located throughout the world. The period of record varies widely from station to station, with a mean of 21.5 years. These data were digitized from published UNESCO archives by Charles Voromarty, Balaze Fekete, and B.A. Tucker of the Complex Systems Research Center (CSRC) at the University of New Hampshire. River discharge is typically measured through the use of a rating curve that relates local water level height to discharge. This rating curve is used to estimate discharge from the observed water level. The rating curves are periodically rechecked and recalibrated through on-site measurement of

2

Marketing men try computer  

Science Journals Connector (OSTI)

Marketing men try computer ... This is an uncomfortable condition for the marketer, since his task becomes more complex and expensive. ...

1966-05-30T23:59:59.000Z

3

Nuclear correction factors from neutrino DIS  

E-Print Network [OSTI]

Neutrino Deep Inelastic Scattering on nuclei is an essential process to constrain the strange quark parton distribution functions in the proton. The critical component on the way to using the neutrino DIS data in a proton PDF analysis is understanding the nuclear effects in parton distribution functions. We parametrize these effects by nuclear parton distribution functions and we use this framework to analyze the consistency of neutrino DIS data with other nuclear data.

K. Kovarik

2011-07-15T23:59:59.000Z

4

Tri-Lab Resources  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tri-Lab Resources Tri-Lab Resources Tri-Lab Computing Resources Computing resources available to Alliance users as of January 2012. Computing resources available Los Alamos Moonlight - 294 compute nodes, 4,704 cores, 488 TF system. Dual 8-core Intel Xeon (Sandy Bridge) processors with two NVIDIA Tesla GPUs per node, w/ InfiniBand. Mustang - 1,600 compute nodes, 38,400 cores, 353 TF system. 24-core AMD Opteron w/ InfiniBand. Mapache - 592 compute nodes, 4,736 cores, 50.4 TF system. SGI XE1300 dual-socket, quad-core Intel Nehalem processors w/ InfiniBand. Pinto - 154 compute nodes, 2,464 cores, 51.3 TF system. Dual 8-core Intel Xeon (Sandy Bridge) processors w/ Infiniband. Lawrence Livermore Cab - 1,296 nodes, 20,736 cores, 333-TF system. Dual 8-core Intel Xeon (Sandy Bridge) processors w/ InfiniBand. Additional information at Cab

5

Directory of RivDIS data  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Directory of RivDIS data Directory of RivDIS data The data consists of tabular data files, html summary tables, and gif images. The images summarize all existing data except for Discharge vs Year, which shows only 1960 - 1990. This index is organized by Country, River, and Station. Clicking on a letter link scrolls you to a country beginning with that letter. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z The most recent update at 10:57:50 on 12/29/1999 included 1018 stations out of the total 1018 stations. See also the README file and the RivDIS Online Home Page for further information. Albania A B C D E F G H I J K L M N O P Q R S T U V W X Y Z (Devolli River) Kokel: Data Summary and Plots (Drini River) Kalimash: Data Summary and Plots (Drini i Zi River) Ura e Dodes: Data

6

Charm production in diffractive DIS and PHP at ZEUS  

E-Print Network [OSTI]

The ZEUS experiment has measured charm production in diffractive DIS and in photoproduction. The data are in agreement with perturbative QCD calculations based on various parameterisations of diffractive parton distribution functions. The results are consistent with QCD factorisation in diffractive DIS and direct photoproduction.

Isabell-Alissandra Melzer-Pellmann; for the ZEUS collaboration

2007-08-03T23:59:59.000Z

7

Tri-Generation Success Story: World's First Tri-Gen EnergyStation...  

Broader source: Energy.gov (indexed) [DOE]

Tri-Generation Success Story: World's First Tri-Gen Energy Station-Fountain Valley Tri-Generation Success Story: World's First Tri-Gen Energy Station-Fountain Valley This Fuel Cell...

8

Simultaneous QCD analysis of diffractive and inclusive DIS data  

E-Print Network [OSTI]

We present a novel analysis of diffractive DIS data, in which the input parton distributions of the Pomeron are parameterised using perturbative QCD expressions. In addition to the usual two-gluon model for the perturbative Pomeron, we allow for the possibility that it may be made from two sea quarks. In particular, we treat individually the components of the Pomeron of different size. This property allows the absorptive corrections to the inclusive DIS structure function F_2 to be calculated using the AGK cutting rules. The absorptive effects are found to enhance the size of the gluon distribution of the proton at small x.

Watt, G; Ryskin, M G

2005-01-01T23:59:59.000Z

9

Simultaneous QCD analysis of diffractive and inclusive DIS data  

E-Print Network [OSTI]

We present a novel analysis of diffractive DIS data, in which the input parton distributions of the Pomeron are parameterised using perturbative QCD expressions. In addition to the usual two-gluon model for the perturbative Pomeron, we allow for the possibility that it may be made from two sea quarks. In particular, we treat individually the components of the Pomeron of different size. This property allows the absorptive corrections to the inclusive DIS structure function F_2 to be calculated using the AGK cutting rules. The absorptive effects are found to enhance the size of the gluon distribution of the proton at small x.

G. Watt; A. D. Martin; M. G. Ryskin

2004-12-15T23:59:59.000Z

10

Single spin asymmetries and vector meson production in DIS  

E-Print Network [OSTI]

We discuss possible measurements and origins of single spin asymmetries in DIS and of some unusual spin properties of vector mesons produced in lepton- nucleon, photon-nucleon and photon-photon interactions. Such effects have already been observed in other processes.

Mauro Anselmino; Francesco Murgia

1998-07-14T23:59:59.000Z

11

Summary of “Future of DIS” Working Group Session  

SciTech Connect (OSTI)

Despite the closure of the HERA accelerator in the past few years, much physics still remains to be understood, from the quark and gluon content of the nucleon/nucleus across all x to the still unknown spin structure of the proton. The 'Future of DIS' working group was dedicated to discussions on these and many other subjects. This paper represents a brief overview of the discussions. For further details, please refer to individual contributions.

Lamont M.; Guzey, V.; Polini, A.

2011-04-11T23:59:59.000Z

12

Tri-Generation Success Story: World's First Tri-Gen Energy Station - Fountain Valley  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tri-Generation Success Tri-Generation Success Story World's First Tri-Gen Energy Station- Fountain Valley The Fountain Valley energy station, supported in part by a $2.2 million grant from the Energy Department, is the world's first tri-generation hydrogen energy and electrical power station to provide transportation fuel to the public and electric power to an industrial facility. Located at the Orange County Sanitation District's wastewater treatment plant in Fountain Valley, California, the unit is a combined heat, hydrogen, and power (CHHP) system that co-produces hydrogen in addition to electricity and heat, making it a tri-generation system. The hydrogen produced by the system

13

The 1-Jettiness DIS event shape: NNLL + NLO results  

E-Print Network [OSTI]

We present results for the complete NNLL+NLO (~ \\alpha_s) 1-jettiness (\\tau_1) event shape distribution for single jet (J) production in electron-nucleus (N_A) collisions e^- + N_A \\to e^- + J + X, in the deep inelastic scattering (DIS) region where the hard scale is set by the jet transverse momentum P_{J_T}. These results cover the entire \\tau_1-spectrum including the resummation (\\tau_1algorithm, and the fixed-order region where an explicit jet algorithm must be specified. Our code, used for generating the numerical results, is flexible enough to incorporate different jet algorithms for the fixed-order...

Kang, Zhong-Bo; Mantry, Sonny

2013-01-01T23:59:59.000Z

14

Tri Cities Biomass Facility | Open Energy Information  

Open Energy Info (EERE)

Tri Cities Biomass Facility Tri Cities Biomass Facility Jump to: navigation, search Name Tri Cities Biomass Facility Facility Tri Cities Sector Biomass Facility Type Landfill Gas Location Maricopa County, Arizona Coordinates 33.2917968°, -112.4291464° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":33.2917968,"lon":-112.4291464,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

15

TriBITS Developers Guide and Reference  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

(bartlettra@ornl.gov) Abstract This document describes the usage of TriBITS to build, test, and deploy complex software. The primary audience are those individuals who develop on...

16

DSM TRIES AGAIN TO SELL A PLANT  

Science Journals Connector (OSTI)

DSM TRIES AGAIN TO SELL A PLANT ... DSM IS ATTEMPTING to sell DSM Special Products, a producer of benzoic acid and derivatives it tried to sell two years ago before being blocked by an antitrust investigation. ... DSM Special Products’ main site, in the Netherlands, is called the world’s largest producer of benzoic acid, a starting point for benzoate plasticizers and the food preservatives sodium and potassium benzoate. ...

MICHAEL MCCOY

2010-08-16T23:59:59.000Z

17

IGBP-DIS Global Primary Production Data Initiative  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

IGBP-DIS Global Primary Production Data Initiative IGBP-DIS Global Primary Production Data Initiative The GPPDI Workshop was held in Cincinnati, U.S.A., December 1996 (Olson et al., 1997). Summary (September 1996) by Dick Olson and Steve Prince from Global Change Newsletter No. 27; International Geosphere-Biosphere Programme: A Study of Global Change (IGBP) of the International Council of Scientific Unions Global modelling and monitoring of net primary production (NPP) is being given high priority in IGBP owing to increasing concern over issues such as the consequences of perturbations in the carbon cycle, the impacts of global land-use change, global climate change, and global food security. Significant advances have been made in process modelling and in the use of remote sensing to monitor global vegetation. The advances in modelling and remote sensing of NPP have highlighted the lack of readily available, reliable information from field studies with which to parameterise and validate the models. The Global Primary Production Data Initiative (GPPDI) is intended to remedy this problem by identifying existing field data sets of primary production and associated environmental data. The programme is using data sets for representative sites, and extrapolating or regionalising the better data sets to grid cells sizes of up to 0.5º x 0.5º. Emphasis is on variables needed to parameterise and validate primary production models, including above and below ground NPP, standing crop, LAI, climate data, site data and landscape variability.

18

DisProt: the Database of Disordered Proteins Megan Sickmeier1  

E-Print Network [OSTI]

DisProt: the Database of Disordered Proteins Megan Sickmeier1 , Justin A. Hamilton1 , Tanguy Le ABSTRACT The Database of Protein Disorder (DisProt) links structure and function information for intrinsically disordered proteins (IDPs). Intrinsically disordered proteins do not form a fixed three

Obradovic, Zoran

19

TriWo AG | Open Energy Information  

Open Energy Info (EERE)

TriWo AG TriWo AG Jump to: navigation, search Name TriWo AG Place Trier, Denmark Zip 54290 Sector Solar Product Developer of solar photovoltaic electricity generation project in Germany. Coordinates 49.757256°, 6.636521° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":49.757256,"lon":6.636521,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

20

Three tri­thia­diazepines and a tri­thia­triazepine  

Science Journals Connector (OSTI)

The most precise determinations to date for the 1,3,5,2,4-tri­thia­diazepine and 1,3,5,2,4,6-tri­thia­triazepine ring systems are presented, including deformation density maps consistent with the expected bonding electron density.

Jones, R.

2013-12-21T23:59:59.000Z

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Rapidity Gaps Between Jets in PHP DIS 2006 , April 22, 2006 -1Patrick Ryan, Univ. of Wisconsin Patrick Ryan  

E-Print Network [OSTI]

Rapidity Gaps Between Jets in PHP DIS 2006 , April 22, 2006 - 1Patrick Ryan, Univ. of Wisconsin in PHP DIS 2006 , April 22, 2006 - 2Patrick Ryan, Univ. of Wisconsin Hard Diffractive Photoproduction - = Subject of this analysis #12;Rapidity Gaps Between Jets in PHP DIS 2006 , April 22, 2006 - 3Patrick Ryan

22

Tri Power Systems Inc | Open Energy Information  

Open Energy Info (EERE)

Inc Inc Jump to: navigation, search Logo: Tri Power Systems Inc Name Tri Power Systems Inc Address P.O. Box 1450 Place Idaho Springs, Colorado Zip 80452 Sector Solar Product Design and installation of solar and wind systems for residential and small business Website http://www.tripowersystems.com Coordinates 39.6904464°, -105.6412527° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":39.6904464,"lon":-105.6412527,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

23

Microsoft Word - TriCity20020828.doc  

Broader source: Energy.gov (indexed) [DOE]

Wednesday, August 28, 2002 Wednesday, August 28, 2002 Department of Energy Awards $600,000 to Tri-City Industrial Development Council Community Reuse Organization WASHINGTON, D.C. - The Department of Energy (DOE) has awarded $600,000 in the form of competitive grants to the Tri-City Industrial Development Council (TRIDEC). TRIDEC is the community reuse organization (CRO) for the department's Hanford site. "The Energy Department is a good neighbor to the communities surrounding our sites," Secretary of Energy Spencer Abraham said. "We will continue to work with TRIDEC and other community reuse organizations around the country, to retain, expand or create jobs for workers affected by restructuring efforts." TRIDEC applied for funding from the department's Office of Worker and Community Transition

24

The 1-Jettiness DIS event shape: NNLL + NLO results  

E-Print Network [OSTI]

We present results for the complete NNLL+NLO (~ \\alpha_s) 1-jettiness (\\tau_1) event shape distribution for single jet (J) production in electron-nucleus (N_A) collisions e^- + N_A \\to e^- + J + X, in the deep inelastic scattering (DIS) region where the hard scale is set by the jet transverse momentum P_{J_T}. These results cover the entire \\tau_1-spectrum including the resummation (\\tau_1algorithm, and the fixed-order region where an explicit jet algorithm must be specified. Our code, used for generating the numerical results, is flexible enough to incorporate different jet algorithms for the fixed-order calculation. We also perform a jet shape analysis, defined within the 1-jettiness framework, which allows one to control the amount of radiation included in the definition of the final state jet. This formalism can allow for detailed studies of jet energy-loss mechanisms and nuclear medium effects. The analysis presented here can be used for precision studies of QCD and as a probe of nuclear dynamics using data collected at HERA and in proposed future electron-ion colliders such as the EIC and the LHeC.

Zhong-Bo Kang; Xiaohui Liu; Sonny Mantry

2013-12-02T23:59:59.000Z

25

1-jettiness DIS event shape: NNLL+NLO results  

Science Journals Connector (OSTI)

We present results for the complete NNLL+NLO (??s) 1-jettiness (?1) event shape distribution for single jet (J) production in electron-nucleus (NA) collisions e?+NA?e?+J+X, in the deep inelastic scattering (DIS) region where the hard scale is set by the jet transverse momentum PJT. These results cover the entire ?1 spectrum including the resummation (?1?PJT) and fixed-order (?1?PJT) perturbative QCD regions. They incorporate nonperturbative soft radiation effects, the anti-kT jet algorithm in the fixed-order calculation, and a smooth matching between the resummation and fixed-order perturbative QCD regions. The matching smoothly connects the spectrum in the resummation region, which can be computed without reference to an external jet algorithm, and the fixed-order region where an explicit jet algorithm must be specified. Our code, used for generating the numerical results, is flexible enough to incorporate different jet algorithms for the fixed-order calculation. We also perform a jet-shape analysis, defined within the 1-jettiness framework, which allows one to control the amount of radiation included in the definition of the final state jet. This formalism can allow for detailed studies of jet energy-loss mechanisms and nuclear medium effects. The analysis presented here can be used for precision studies of QCD and as a probe of nuclear dynamics using data collected at HERA and in proposed future electron-ion colliders such as the EIC and the LHeC.

Zhong-Bo Kang; Xiaohui Liu; Sonny Mantry

2014-07-23T23:59:59.000Z

26

NETL CT Imaging Facility  

SciTech Connect (OSTI)

NETL's CT Scanner laboratory is equipped with three CT scanners and a mobile core logging unit that work together to provide characteristic geologic and geophysical information at different scales, non-destructively.

None

2013-09-04T23:59:59.000Z

27

NETL CT Imaging Facility  

ScienceCinema (OSTI)

NETL's CT Scanner laboratory is equipped with three CT scanners and a mobile core logging unit that work together to provide characteristic geologic and geophysical information at different scales, non-destructively.

None

2014-05-21T23:59:59.000Z

28

Nuclear Medicine CT Angiography  

E-Print Network [OSTI]

Nuclear Medicine CT Angiography Stress Testing Rotation The Nuclear Medicine/CT angiography. Understand the indications for exercise treadmill testing and specific nuclear cardiology tests, safe use Level 2 proficiency in performing and interpreting cardiac nuclear imaging tests. Progression

Ford, James

29

CAREERS & the disABLED Magazine's Career Expo for People with...  

Broader source: Energy.gov (indexed) [DOE]

People with Disabilities CAREERS & the disABLED Magazine's Career Expo for People with Disabilities November 22, 2013 1:00PM EST Washington DC Contact http:www.eop.comexpos.php...

30

function of temperature. Similar studies (with neutrons) on uranium led to the dis-  

E-Print Network [OSTI]

1059 function of temperature. Similar studies (with neutrons) on uranium led to the dis- covery to the North Pole and that there was northward mo- tion of the Pacific plate. Conversely, if all seamounts had

Steinberger, Bernhard

31

A Heart of Gold? Try Platinum | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

A Heart of Gold? Try Platinum A Heart of Gold? Try Platinum December 1, 2014 - 3:21pm Addthis This coronary stent is made with a lab-developed, award-winning platinum-chromium...

32

Tri-Generation Success Story: World's First Tri-Gen Energy Station—Fountain Valley  

Broader source: Energy.gov [DOE]

This Fuel Cell Technologies Office fact sheet describes the Fountain Valley energy station. Supported in part by a $2.2 million grant from the Energy Department, the Fountain Valley energy station is the world’s first tri-generation hydrogen energy and electrical power station to provide transportation fuel to the public and electric power to an industrial facility.

33

Dual Magnetic Separator for TRI$?$P  

E-Print Network [OSTI]

The TRI$\\mu$P facility, under construction at KVI, requires the production and separation of short-lived and rare isotopes. Direct reactions, fragmentation and fusion-evaporation reactions in normal and inverse kinematics are foreseen to produce nuclides of interest with a variety of heavy-ion beams from the superconducting cyclotron AGOR. For this purpose, we have designed, constructed and commissioned a versatile magnetic separator that allows efficient injection into an ion catcher, i.e., gas-filled stopper/cooler or thermal ionizer, from which a low energy radioactive beam will be extracted. The separator performance was tested with the production and clean separation of $^{21}$Na ions, where a beam purity of 99.5% could be achieved. For fusion-evaporation products, some of the features of its operation as a gas-filled recoil separator were tested.

G. P. A. Berg; O. C. Dermois; U. Dammalapati; P. Dendooven M. N. Harakeh; K. Jungmann; C. J. G. Onderwater; A. Rogachevskiy; M. Sohani; E. Traykov; L. Willmann; H. W. Wilschut

2005-09-09T23:59:59.000Z

34

Characterization of Tri-lab Tantalum Plate.  

SciTech Connect (OSTI)

This report provides a detailed characterization Tri-lab Tantalum (Ta) plate jointly purchased from HCStark Inc. by Sandia, Los Alamos and Lawrence Livermore National Laboratories. Data in this report was compiled from series of material and properties characterization experiments carried out at Sandia (SNL) and Los Alamos (LANL) Laboratories through a leveraged effort funded by the C2 campaign. Results include microstructure characterization detailing the crystallographic texture of the material and an increase in grain size near the end of the rolled plate. Mechanical properties evaluations include, compression cylinder, sub-scale tension specimen, micohardness and instrumented indentation testing. The plate was found to have vastly superior uniformity when compare with previously characterized wrought Ta material. Small but measurable variations in microstructure and properties were noted at the end, and at the top and bottom edges of the plate.

Buchheit, Thomas E.; Cerreta, Ellen K.; Deibler, Lisa Anne; Chen, Shu-Rong; Michael, Joseph R.

2014-09-01T23:59:59.000Z

35

Baryon Tri-local Interpolating Fields  

E-Print Network [OSTI]

We systematically investigate tri-local (non-local) three-quark baryon fields with U_L(2)*U_R(2) chiral symmetry, according to their Lorentz and isospin (flavor) group representations. We note that they can also be called as "nucleon wave functions" due to this full non-locality. We study their chiral transformation properties and find all the possible chiral multiplets consisting J=1/2 and J=3/2 baryon fields. We find that the axial coupling constant |g_A| = 5/3 is only for nucleon fields belonging to the chiral representation (1/2,1)+(1,1/2) which contains both nucleon fields and Delta fields. Moreover, all the nucleon fields belonging to this representation have |g_A| = 5/3.

Hua-Xing Chen

2012-05-24T23:59:59.000Z

36

Tri Global Energy LLC | Open Energy Information  

Open Energy Info (EERE)

Global Energy LLC Global Energy LLC Jump to: navigation, search Name Tri Global Energy LLC Place Dallas, Texas Zip 75248 Sector Services, Solar, Wind energy Product Texas-based developer that offers a full range of services in planning, design, project financing, and construction for solar and large community-based wind projects. Coordinates 32.778155°, -96.795404° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":32.778155,"lon":-96.795404,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

37

-CT CT)Computed Tomography(. ,. , -100 ,  

E-Print Network [OSTI]

· . · , , , , . · , " , , . · , . , . : · . ·2-4 . ·2-3 -. ·) D,DMAIC, SPC, FMEA, Control Plan, Lean) 8(-. · -. ·. ·. NPI ·. · , , .' , ·" . " * . : ·) B.A ,(-. ·4-6. ·) QFD, CtQ breakdown, DfSS, SPC, AQP, FMEA, Control Plan.( ·Six Sigma GB

Pinsky, Ross

38

PNNL: EDO - Tri-Cities Tech Business Update  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tri-Cities Tech Business Update Tri-Cities Tech Business Update This monthly e-mailed update contains news, opportunities, upcoming events, and other information about Mid-Columbia tech businesses and the organizations that support them. Browse the archives for back issues. Printer Friendly Version January 2014 Issue Startups Move Ahead Businesses that were launched at the first-ever Tri-Cities Startup Weekend in September are moving ahead. more... Books by Local Authors Two recent books by Tri-Cities authors provide insights about technology marketing and economic development, respectively. more... Port of Pasco Appointments Gary Ballew joined the Port of Pasco as the director of economic development and marketing on December 16. more... Tri-City Chamber Appointment The Tri-City Regional Chamber of Commerce has hired Austin Neilson as its

39

Tri-Party Agreement Hanford Public Involvement Plan  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 Excerpts from the Comment and Response Document on the Tri-Party Agreement Hanford Public Involvement Plan The comments submitted by the Hanford Advisory Board (Advice 251)...

40

Tri-Party Agreement Agencies Annual Hanford Public Involvement...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of 17 Tri-Party Agreement Agencies Annual Hanford Public Involvement Survey 1. How do you usually receive information about Hanford topics? (Please select all that apply) Response...

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Tri-Cities Index of Innovation and Technology  

SciTech Connect (OSTI)

In 2001 and 2004, the Economic Development Office of Pacific Northwest National Laboratory published companion reports to the Washington Technology Center Index studies that provided additional information on the Tri-Cities (Kennewick-Richland-Pasco) area of the state, its technology businesses, and important advantages that the Tri-Cities have as places to live and do business. These reports also compared the Tri-Cities area to other technology-based metropolitan areas in the Pacific Northwest and nation along critical dimensions known to be important to technology firms. This report updates the material in these earlier reports, and highlights a growing Tri-Cities metropolitan area.

Fowler, Richard A.; Scott, Michael J.; Butner, Ryan S.

2011-01-17T23:59:59.000Z

42

ABSORPTION TIME AND TREE LENGTH OF THE KINGMAN COALESCENT AND THE GUMBEL DIS-  

E-Print Network [OSTI]

ABSORPTION TIME AND TREE LENGTH OF THE KINGMAN COALESCENT AND THE GUMBEL DIS- TRIBUTION M. M¨ohle1 to revisit the moments and central moments of the classical Gumbel distribution. Keywords: absorption time of coalescent processes (restricted to a sample of size n N) such as the number of jumps, the absorption time

Möhle, Martin

43

CT Solar Loan  

Broader source: Energy.gov [DOE]

The Clean Energy Finance and Investment Authority is offering a pilot loan program, CT Solar Loan, to provide homeowners with 15-year loans for solar PV equipment. The loans are administered...

44

(TWST = Tri-Cities West Building) West Building  

E-Print Network [OSTI]

Elevator (TWST = Tri-Cities West Building) West Building 1st Floor Stage to parking lot Nursing TV Parking Lot and Cougar Garden Admissions Elevator Elevator Commons To the East Building Mac Lab Vet Center Professional Programs Student Affairs Nursing Lab Media Services Lobby West Building 2nd Floor (TWST = Tri

Collins, Gary S.

45

Tri-County Electric Cooperative - Energy Efficient Water Heater Rebate  

Broader source: Energy.gov (indexed) [DOE]

Tri-County Electric Cooperative - Energy Efficient Water Heater Tri-County Electric Cooperative - Energy Efficient Water Heater Rebate Program Tri-County Electric Cooperative - Energy Efficient Water Heater Rebate Program < Back Eligibility Commercial Residential Savings Category Appliances & Electronics Water Heating Program Info State Texas Program Type Utility Rebate Program Rebate Amount $75 Provider Tri-County Electric Cooperative Tri-County Electric Cooperative offers a $75 rebate on the purchase of energy-efficient electric water heaters. The rebate is valid for new or replacement units which have an Energy Factor Rating of 0.90 or higher. The minimum tank size is 40 gallons, with a minimum 4,500 watt heating element. For validation purposes, a copy of the sales or installation receipt must accompany the [http://www.tcectexas.com/Forms/water%20heater%20rebate%20form.pdf

46

DIS08 Jol Feltesse 1 Combination of H1 and ZEUS  

E-Print Network [OSTI]

fitted H1-ZEUS combined H1-value 2 exp Mi,true , j ) = i Mi,true - Mi + j Mi j j ) 2 2 i + j j 2 j Mi i j Mi j Mi,true Mi j j #12;DIS08 Joël Feltesse 11 definition (cont'd) Caution : Most errors are provided smaller averages ! (checked with a toy model) Can be avoided by modifying chi2 definition 2 2 exp Mi

47

N. Raicevic EPS 2007 1 Measurement of the Neutral Current DIS  

E-Print Network [OSTI]

N. Raicevic EPS 2007 1 Measurement of the Neutral Current DIS Cross Section at H1 Natasa Raicevië Manchester 19th ­ 25th July, 2007 #12;N. Raicevic EPS 2007 2 In 2000-2002 HERA-I (Ep = 820, 920 GeV) upgraded to HERA-II (Ep = 920 GeV) · Increased luminosity · Polarised leptons Since April 2007 until the end

48

Measuring sin^2 theta_W in PV-DIS with the Baseline Spectrometers at JLab 12 GeV  

SciTech Connect (OSTI)

The couplings of leptons to quarks are fundamental parameters of the electroweak interaction. Within the framework of the Standard Model, these couplings can be related to sin2 theta W. Parity violation (PV) in deep inelastic scattering (DIS) is proportional to these couplings and hence sensitive sin2 theta W. PV-DIS, first measured at SLAC in the mid-1970¿s, was used to establish the Standard Model. The high quality and intensity of the upgraded 11 GeV CEBAF beam at Jefferson Laboratory will make it an ideal tool for PV studies. In DIS the asymmetry from parity violation is large (APV ~ 10^?4 Q^2), allowing precise measurements with modest beam-time. This talk will explore a PV-DIS measurement which can be made using the baseline spectrometers that will exist as part of the 12 GeV JLab upgrade.

Paul Reimer

2007-07-18T23:59:59.000Z

49

Compiti scritti di Robotica 2 http://www.dis.uniroma1.it/labrob/people/deluca/rob2.html  

E-Print Network [OSTI]

Compiti scritti di Robotica 2 http://www.dis.uniroma1.it/labrob/people/deluca/rob2.html Anno Data.06 1 Pianificazione del moto con decomposizione approssimata in celle soluzione (ex Robotica

De Luca, Alessandro

50

TRI State Motor Transit to Resume Shipping Waste to WIPP  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tri-State Motor Transit to Resume Tri-State Motor Transit to Resume Shipping Transuranic Waste to WIPP CARLSBAD, N.M., January 19, 2001 - Tri-State Motor Transit will resume shipping waste to the Waste Isolation Pilot Plant (WIPP) January 22, transporting transuranic waste from the Idaho National Engineering and Environmental Laboratory (INEEL) to WIPP. This will be the first shipment by Tri-State Motor Transit (TSMT) to WIPP since the November 21 incident in which drivers hauling waste from INEEL to WIPP failed to make the turn off from I-25 onto U.S. 285, deviating from the designated transportation route by 27 miles. The New Mexico State Police noticed the route deviation and contacted the TRANSCOM Control Center (TCC) in Albuquerque to verify that the shipment was off course. The TCC confirmed the route deviation using their tracking system and notified the drivers, via

51

Tri-County Rural Elec Coop Inc | Open Energy Information  

Open Energy Info (EERE)

Tri-County Rural Elec Coop Inc Tri-County Rural Elec Coop Inc Place Pennsylvania Utility Id 40290 Utility Location Yes Ownership C NERC Location RFC NERC RFC Yes RTO PJM Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png 3 Phase Demand Commercial 3 Phase Demand Tri-county Commercial CP1 Commercial CP3 Industrial ETS2D Commercial ETS2M Commercial ETSDM Commercial ETSTC Commercial LP2 Commercial LP3 Industrial NCP1 Residential Residential Residential 2C Residential Residential 3C Residential Residential 4C Residential Residential Tri-County Residential Seasonal Budget Commercial

52

Which LED Lighting Products Would You Consider Trying? | Department of  

Broader source: Energy.gov (indexed) [DOE]

Which LED Lighting Products Would You Consider Trying? Which LED Lighting Products Would You Consider Trying? Which LED Lighting Products Would You Consider Trying? August 5, 2010 - 7:30am Addthis On Monday, Chris discussed his upcoming project to replace the lighting in his kitchen and family room. Chris is considering LED (light-emitting diode) lighting, especially for his kitchen, where they can be installed under the cabinets. LEDs can also be used for other applications, including task lighting, recessed downlights, and holiday lighting. Which LED lighting products would you consider trying? Or, if you're already using LEDs, what do you think of them? Each Thursday, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. Please comment with your answers, and also feel free to respond to other comments.

53

Have You Ever Tried Composting? | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Ever Tried Composting? Ever Tried Composting? Have You Ever Tried Composting? January 20, 2012 - 10:07am Addthis This week, Erin talked about how she's helping her parents (and learning from them) as they maintain an outdoor compost pile. By composting, you can nourish your garden for very little cost while keeping organic garbage out of sewer systems and city dumps. Compost materials range from food scraps to worms, and you can keep your compost in an open pile outdoors or in a specialized container. Of course, composting isn't just for homes - you can also participate in composting at the office. Whether at work or at home, indoors or outdoors, worms or food scraps: Have you ever tried composting? Why or why not? E-mail your responses to the Energy Saver team at consumer.webmaster@nrel.gov.

54

Office of Small and Disadvantaged Business Utilization Tri-Fold  

Broader source: Energy.gov [DOE]

OSDBU has created a downloadable, print-on-demand tri-fold PDF that introduces the office, its role in the Department of Energy and its goals for supporting small business nationwide.

55

A new relational Tri-training system with adaptive data editing for inductive logic programming  

Science Journals Connector (OSTI)

Relational Tri-training (R-Tri-training for short), as a relational semi-supervised learning system, can effectively exploit unlabeled examples to improve the generalization ability. However, the R-Tri-training may also suffer from the common problem ... Keywords: Adaptive strategy, Data editing, Inductive logic programming, Machine learning, PAC learning, Relational Tri-training, Tri-training

Yanjuan Li; Maozu Guo

2012-11-01T23:59:59.000Z

56

Resonant Soft X-Ray Scattering of Tri-Block Copolymers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resonant Soft X-Ray Scattering of Tri-Block Copolymers Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print Wednesday, 30 May 2012 00:00 In principle, tri-block copolymers...

57

Hawkeye Tri-County El Coop Inc | Open Energy Information  

Open Energy Info (EERE)

Tri-County El Coop Inc Tri-County El Coop Inc Jump to: navigation, search Name Hawkeye Tri-County El Coop Inc Place Iowa Utility Id 8298 Utility Location Yes Ownership C NERC Location MRO NERC MRO Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Rate Commercial Interruptible Rate Residential Large Power Rate Commercial Outdoor Lighting Non-Metered General Lighting Peak Alert Rate Commercial Single Phase Residential Average Rates Residential: $0.1360/kWh Commercial: $0.0987/kWh Industrial: $0.0706/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a"

58

Microsoft Word - TriCityWashingtonState20020620.doc  

Broader source: Energy.gov (indexed) [DOE]

Tri-City Tri-City Industrial Development Council in Washington State WASHINGTON, D.C. - The Department of Energy (DOE) today announced that it will award $300,000 to the Tri-City Industrial Development Council (TRIDEC). TRIDEC's goal is to assist affected communities impacted by the ultimate closure of the Hanford facility that has served as the primary employment source for over 50 years. The grant will provide $200,000 for program administration and $100,000 for the Asset Reinvestment Program. "The Energy Department is a good neighbor to the communities surrounding our sites," Secretary of Energy Spencer Abraham said. "Working with TRIDEC and other community reuse organizations around the country, the Department has retained, expanded or created over

59

Tri-County Electric Coop, Inc (Florida) | Open Energy Information  

Open Energy Info (EERE)

Tri-County Electric Coop, Inc (Florida) Tri-County Electric Coop, Inc (Florida) Jump to: navigation, search Name Tri-County Electric Coop, Inc Place Florida Utility Id 19161 Utility Location Yes Ownership C NERC Location FRCC NERC FRCC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial General Three- Phase Service Time- Of- Day Schedule Commercial Commercial Outdoor Lighting HPS 100 W Lighting Commercial Outdoor Lighting HPS 150 W Lighting Commercial Outdoor Lighting HPS 400 W Lighting Commercial Outdoor Lighting MHF 400 W Lighting Commercial Outdoor Lighting MV 175 W Lighting

60

Tri-State Electric Member Corp | Open Energy Information  

Open Energy Info (EERE)

Tri State Electric Membership Corporation) Tri State Electric Membership Corporation) Jump to: navigation, search Name Tri-State Electric Member Corp Place McCaysville, Georgia Utility Id 19154 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] SGIC[2] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Rate 1 - Residential Residential Rate 40 - Small Commercial GSA-1 (less 50 kW) Commercial Rate 50 - Commercial GSA-2 (51-1000 kW) Commercial Rate 54 - Large Commercial GSA-3 (1001-5000 kW) Commercial Rate 57 - Seasonal Demand Commercial Rate 72 - Street Lighting Lighting

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Tri-Cities research may help biofuels take flight  

SciTech Connect (OSTI)

Monthly economic diversity column for the Tri-City Herald. Excerpt: If you stop and think about it, some pretty interesting stuff has roots in the Tri-Cities, but reaches far beyond. Many Tri-Citians have gone on to be professional athletes, entertainers, scientists and engineers, doctors, lawyers, and humanitarians to name just a few. And a lot of groundbreaking discoveries - many born of strategic collaborations resulting from purposeful economic development efforts - have emerged from work at our local national laboratory. Just recently, Pacific Northwest National Laboratory entered into a $2M collaboration with Seattle biofuel producer Imperium Renewables and other partners to develop a new method to make renewable jet fuels. Successful development of the catalytic process, which converts biomass-based alcohols into renewable drop-in jet fuels, could lead to additional renewable jet fuel production facilities being built and operated in the Pacific Northwest.

Madison, Alison L.

2011-12-04T23:59:59.000Z

62

Tri-Cities an ideal environment for biofuels research  

SciTech Connect (OSTI)

These days, you don’t have to go far to hear a little something about renewable power. And in the Tri-Cities, you needn’t look beyond your own backyard. At the Bioproducts, Sciences, and Engineering Laboratory--BSEL--on Washington State University’s Richland campus, scientists are doing some cutting edge research on the conversion of biomass to fuels and value-added products that are traditionally derived from petroleum. The facility, built by the State of Washington, houses scientists from both Pacific Northwest National Laboratory and WSU Tri-Cities.

Madison, Alison L.

2010-09-05T23:59:59.000Z

63

Tri-County Electric Coop, Inc (Oklahoma) | Open Energy Information  

Open Energy Info (EERE)

Tri-County Electric Coop, Inc Tri-County Electric Coop, Inc Name Tri-County Electric Coop, Inc Address PO Box 880 302 East Glaydas Place Hooker, Oklahoma Zip 73945 Product Distribution Electric Cooperative Year founded 1945 Number of employees 51-200 Phone number 800-522-3315 Website www.tri-countyelectric.co Coordinates 36.860745°, -101.212242° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":36.860745,"lon":-101.212242,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

64

RENEWAL THEORY IN ANALYSIS OF TRIES AND SVANTE JANSON  

E-Print Network [OSTI]

RENEWAL THEORY IN ANALYSIS OF TRIES AND STRINGS SVANTE JANSON To my colleague and friend Allan Gut on the occasion of his retirement Abstract. We give a survey of a number of simple applications of renewal theory been realized that renewal theory is a useful tool in the study of random strings and related

Janson, Svante

65

DisClose: Discovering Colossal Closed Itemsets via a Memory Efficient Compact Row-Tree  

SciTech Connect (OSTI)

Itemset mining has recently focused on discovery of frequent itemsets from high-dimensional datasets with relatively few rows and a larger number of items. With exponentially in-creasing running time as average row length increases, mining such datasets renders most conventional algorithms impracti-cal. Unfortunately, large cardinality closed itemsets are likely to be more informative than small cardinality closed itemsets in this type of dataset. This paper proposes an approach, called DisClose, to extract large cardinality (colossal) closed itemsets from high-dimensional datasets. The approach relies on a memory-efficient Compact Row-Tree data structure to represent itemsets during the search process. The search strategy explores the transposed representation of the dataset. Large cardinality itemsets are enumerated first followed by smaller ones. In addition, we utilize a minimum cardinality threshold to further reduce the search space. Experimental result shows that DisClose can complete the extraction of colossal closed itemsets in the considered dataset, even for low support thresholds. The algorithm immediately discovers closed itemsets without needing to check if each new closed itemset has previously been found.

Zulkurnain, Nurul F.; Keane, John A.; Haglin, David J.

2013-02-01T23:59:59.000Z

66

Microsoft Word - Tri-State Case Study.docx  

Broader source: Energy.gov (indexed) [DOE]

m illion, f unded p artially w ith o ver 1.1 m illion i n R ecovery A ct f unding f rom t he U.S. D epartment o f E nergy ( DOE), T ri---State h as c ompleted i nstallation o...

67

Tri-County Electric Coop (Michigan) | Open Energy Information  

Open Energy Info (EERE)

Tri-County Electric Coop Tri-County Electric Coop Place Michigan Utility Id 19396 Utility Location Yes Ownership C NERC Location RFC NERC RFC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Controlled Heating Commercial Controlled Water Heater Service Commercial Customer-Owned Back-Up Generation Industrial Farm and Home Optional Time-of-Day Residential Farm and Home Service Residential Farm and Home Service (Multiple Dwellings) Residential General Service - Single Phase Commercial General Service - Single Phase (Controlled) Commercial General Service - Three Phase Commercial

68

Tri State Electric Membership Corporation Smart Grid Project | Open Energy  

Open Energy Info (EERE)

Electric Membership Corporation Smart Grid Project Electric Membership Corporation Smart Grid Project Jump to: navigation, search Project Lead Tri State Electric Membership Corporation Country United States Headquarters Location McCaysville, Georgia Additional Benefit Places Tennessee Recovery Act Funding $1,138,060.00 Total Project Value $2,421,405.00 Coverage Area Coverage Map: Tri State Electric Membership Corporation Smart Grid Project Coordinates 34.9861914°, -84.3713117° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[]}

69

Tri-County Elec Member Corp | Open Energy Information  

Open Energy Info (EERE)

Tri-County Elec Member Corp Tri-County Elec Member Corp Place Georgia Utility Id 18956 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Church Demand - Single Phase Commercial Church Demand - Single Phase* Commercial Church Demand - Three Phase Commercial Church Demand - Three Phase* Commercial Church Service Basic Nondemand Commercial Church Service Electric NonDemand General Service Demand - Single Phase Industrial General Service Demand - Single Phase* Commercial General Service Demand - Three Phase Industrial

70

Tri-County Elec Member Corp (Tennessee) | Open Energy Information  

Open Energy Info (EERE)

Tri-County Elec Member Corp Tri-County Elec Member Corp Place Tennessee Utility Id 19162 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png 100 Watt HPS Lighting 100 Watt Induction Lighting 1000 Watt MH Lighting 103 Watt LED Lighting 175 Watt MV Lighting 200 Watt HPS Lighting 250 Watt HPS Lighting 400 Watt HPS Lighting 400 Watt MH Lighting 400 Watt MV Lighting 51 Watt LED Lighting 85 Watt Induction Lighting GSA-Part 1 Commercial GSA-Part 2 Commercial GSA-Part 3 Industrial Residential Residential Average Rates

71

Developing DisCo: A distributed co-design, on-line tool SUBMITTED TO THE COLLEGE OF INFORMATION STUDIES DOCTORAL  

E-Print Network [OSTI]

Developing DisCo: A distributed co-design, on-line tool SUBMITTED TO THE COLLEGE OF INFORMATION-based design tool that facilitates distributed co-design through Layered Elaboration. Layered Elaboration-based system allows co-designers to work asynchronously while being geographically distributed. DisCo contains

Golbeck, Jennifer

72

ASPEN modeling of the Tri-State indirect liquefaction process  

SciTech Connect (OSTI)

The ASPEN process simulator has been used to model an indirect liquefaction flowsheet patterned after that of the Tri-State project. This flowsheet uses Lurgi moving-bed gasification with synthesis gas conversion to methanol followed by further processing to gasoline using the Mobil MTG process. Models developed in this study include the following: Lurgi gasifier, Texaco gasifier, synthesis gas cooling, Rectisol, methanol synthesis, methanol-to-gasoline, CO-shift, methanation, and naphtha hydrotreating. These models have been successfully developed in modular form so that they can be used to simulate a number of different flowsheets or process alternatives. Simulations of the Tri-State flowsheet have been made using two different coal feed rates and two types of feed coal. The overall simulation model was adjusted to match the Tri-State flowsheet values for methanol, LPG, isobutane, and gasoline. As a result of this adjustment, the MTG reactor yield structure necessary to match the flowsheet product rates was determined. The models were exercised at different flow rates and were unaffected by such changes, demonstrating their range of operability. The use of Illinois No. 6 coal, with its lower ash content, resulted in slightly higher production rates for each of the products as compared to use of the Kentucky coal.

Begovich, J.M.; Clinton, J.H.; Johnson, P.J.; Barker, R.E.

1983-01-01T23:59:59.000Z

73

Abstract Microgrids are a new concept for future energy dis-tribution systems that enable renewable energy integration and  

E-Print Network [OSTI]

distributed generators (DGs) that are usually integrated via power-electronic inverters. In order to enhance generators (DGs) has been significantly improved. Inverter-interfaced DGs can be flexibly deployed in power1 Abstract ­ Microgrids are a new concept for future energy dis- tribution systems that enable

Collins, Emmanuel

74

Tri-Party Agreement databases, access mechanism and procedures  

SciTech Connect (OSTI)

This document contains the information required for the Washington State Department of Ecology (Ecology) and the US Environmental Protection Agency (EPA) to access databases related to the Hanford Federal Facility Agreement and Consent Order [also known as the Tri-Party Agreement (TPA)] (Ecology et al. 1992). It identifies the procedure required to obtain access to the Hanford computer networks and the TPA related databases. It addresses security requirements, access methods, database availability dates, database access procedures, and the minimum computer hardware and software configurations required to operate within the Hanford networks.

Brulotte, P.J.; Christensen, K.C.

1993-10-01T23:59:59.000Z

75

An innovative tri-directional broadband piezoelectric energy harvester  

SciTech Connect (OSTI)

This paper presents a tri-directional piezoelectric energy harvester that is able to harvest vibration energy over a wide bandwidth from three orthogonal directions. The harvester consists of a main beam, an auxiliary beam, and a spring-mass system, with magnets integrated to introduce nonlinear force and couple the three sub-systems. Theoretical analysis and experiments were performed at constant acceleration under frequency sweeps to acquire frequency responses. The experimental results show that the voltage can achieve more than 2?V over more than 5?Hz of bandwidth with 1 M? load in the three orthogonal directions.

Su, Wei-Jiun, E-mail: weijiun@mie.utoronto.ca; Zu, Jean [Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8 (Canada)] [Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8 (Canada)

2013-11-11T23:59:59.000Z

76

CT NC0  

Office of Legacy Management (LM)

x-L* d! x-L* d! CT NC0 - i , ,. i, .' i :.:(e.!' ,A\~, L.,t, - (iI :i' , . y- 2 .L i ._ 1 c\ :- i;! Ii $ 4. Ci:lc:i.nnati. 39, t>:::i.f> (J&l3 q-1 -3 sui3 Jrn T3 FRCM .I iirz 1 ?j ~ 1.3 bL1 T:' IP !REFOI?T TC 5YC?CZCiC~ :EWllIFl;j",tsSS L' I"JIsIc:;. .:;xli3;. iCAN !fA(=;-fL,yg-j L' sc,, E. $.iCLX:i?, -iIJ,x:q()Is. ON hL4X 24 - 25 ) 1.9tic ;i. A. Quiglel;, A.3, 3, M. ChenauEt gpxrIvB OF TP.~ The purpose of t3is trip was tc observe a proposed method for the dchy- dratim of green salt md to determine that all health and safety measures were being xrried out, SurveiU.ance of this nature provided protection against excessi3z personnel exposure, insured compliance with ICC shipping regulaticns, tion of the equ'~ and determined when adequate decontamira-

77

TRI.NET data engine for EPA Toxics Release Inventory | Data.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

TRI.NET data engine for EPA Toxics Release Inventory TRI.NET data engine for EPA Toxics Release Inventory Consumer Data Apps Challenges Resources About Blogs Let's Talk Feedback Consumer You are here Data.gov » Communities » Consumer » Data TRI.NET data engine for EPA Toxics Release Inventory Dataset Summary Description TRI.NET ("T-R-I-dot-net") is a new application developed by EPA to help you analyze Toxics Release Inventory (TRI) information. This application is capable of easily and quickly performing complex queries to help you understand TRI information. It is especially useful for analysts who need a highly interactive environment in order to refine their queries and analyses in an efficient and productive way. TRI.NET makes heavy use of mashups using the latest mapping technologies to help visualize where TRI releases are occurring.

78

The option to try again : valuing a sequence of dependent trials  

E-Print Network [OSTI]

In various fields of economic endeavor, agents enjoy the option to ?try, try again.? Failure in a particular pursuit often brings renewed effort to finally succeed. Many areas of R&D could be characterized in this fashion. ...

Smith, James L.

2004-01-01T23:59:59.000Z

79

$300,000 Block Grant Awarded to Tri-City Industrial Development...  

Broader source: Energy.gov (indexed) [DOE]

300,000 Block Grant Awarded to Tri-City Industrial Development Council (TRIDEC) 300,000 Block Grant Awarded to Tri-City Industrial Development Council (TRIDEC) 300,000 Block...

80

Generic TriBITS PRoject, Build, Test, and Install Quick Reference...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Generic TriBITS PRoject, Build, Test, and Install Quick Reference Guide Ross Bartlett Oak Ridge National Laboratory CASL-U-2014-0075-000-a CASL-U-2014-0075-000-a Generic TriBITS...

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

FIA-14-0064- In the Matter of Tri-Valley CAREs  

Broader source: Energy.gov [DOE]

On October 7, 2014, The Office of Hearings and Appeals (OHA) denied an Appeal filed by Tri-Valley CAREs (Tri-Valley) under the FOIA of a final determination issued by the National Nuclear Security...

82

The DIS(chi) Scheme for Heavy Quark Production at Small x.  

E-Print Network [OSTI]

ar X iv :h ep -p h/ 06 05 32 1v 1 2 9 M ay 2 00 6 February 2, 2008 6:9 Proceedings Trim Size: 9in x 6in Cavendish-HEP-2006/12 THE DIS(?) SCHEME FOR HEAVY QUARK PRODUCTION AT SMALL X C. D. WHITE Cavendish Laboratory, J. J. Thomson Avenue... ×10-4 Q2(GeV2) F 2 p (x ,Q 2 ) + 0 .25 (9- i) LL resummed NLO 0 0.5 1 1.5 2 2.5 3 3.5 4 1 10 10 2 10 3 x=5×10-4 x=6.32×10-4 x=8×10-4 x=1.3×10-3 x=1.61×10-3 x=2×10-3 x=3.2×10-3 x=5×10-3 x=8×10-3 H1 (×1.02) ZEUS(×1.004) NMC(×0.996) LL resummed NLO Q2(GeV2...

White, C D

83

Category:Bridgeport, CT | Open Energy Information  

Open Energy Info (EERE)

Bridgeport, CT Bridgeport, CT Jump to: navigation, search Go Back to PV Economics By Location Media in category "Bridgeport, CT" The following 16 files are in this category, out of 16 total. SVFullServiceRestaurant Bridgeport CT Connecticut Light & Power Co.png SVFullServiceRestauran... 64 KB SVQuickServiceRestaurant Bridgeport CT Connecticut Light & Power Co.png SVQuickServiceRestaura... 63 KB SVHospital Bridgeport CT Connecticut Light & Power Co.png SVHospital Bridgeport ... 71 KB SVLargeHotel Bridgeport CT Connecticut Light & Power Co.png SVLargeHotel Bridgepor... 67 KB SVLargeOffice Bridgeport CT Connecticut Light & Power Co.png SVLargeOffice Bridgepo... 72 KB SVMediumOffice Bridgeport CT Connecticut Light & Power Co.png SVMediumOffice Bridgep...

84

Tri-State Electric Member Corp | Open Energy Information  

Open Energy Info (EERE)

Jump to: navigation, search Jump to: navigation, search Name Tri-State Electric Member Corp Place McCaysville, Georgia Utility Id 19154 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] SGIC[2] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Rate 1 - Residential Residential Rate 40 - Small Commercial GSA-1 (less 50 kW) Commercial Rate 50 - Commercial GSA-2 (51-1000 kW) Commercial Rate 54 - Large Commercial GSA-3 (1001-5000 kW) Commercial Rate 57 - Seasonal Demand Commercial Rate 72 - Street Lighting Lighting Rate 73 - Athletic Field Lighting Lighting

85

Tri-County Elec Member Corp (Kentucky) | Open Energy Information  

Open Energy Info (EERE)

Corp (Kentucky) Corp (Kentucky) Jump to: navigation, search Name Tri-County Elec Member Corp Place Kentucky Utility Id 19162 References EIA Form EIA-861 Final Data File for 2010 - File2_2010[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png 100 Watt HPS Lighting 100 Watt Induction Lighting 1000 Watt MH Lighting 103 Watt LED Lighting 175 Watt MV Lighting 200 Watt HPS Lighting 250 Watt HPS Lighting 400 Watt HPS Lighting 400 Watt MH Lighting 400 Watt MV Lighting 51 Watt LED Lighting 85 Watt Induction Lighting GSA-Part 1 Commercial GSA-Part 2 Commercial GSA-Part 3 Industrial Residential Residential Average Rates Residential: $0.0941/kWh Commercial: $0.1050/kWh

86

Frostbite Theater - Experiments You Can Try at Home! - Optical Illusions  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Squealing Dry Ice Squealing Dry Ice Previous Video (Squealing Dry Ice) Frostbite Theater Main Index Next Video (Let's Make Oobleck!) Let's Make Oobleck! Optical Illusions Which square appears to be darker, square A or square B? This is an optical illusion you can do at home for yourself! Want to do this yourself? Download the graphic and give it a try! [ Show Transcript ] Announcer: Frostbite Theater presents... Cold Cuts! No baloney! Joanna and Steve: Just science! Joanna: Hi! I'm Joanna! Steve: And I'm Steve! Joanna: During Jefferson Lab's Science Series lecture, Dr. Eric Mazur of Harvard University showed the audience an optical illusion that we thought we'd share with you! Steve: Here's the basic set-up. There is what appears to be a green cylinder casting a shadow on a checker board. One square is labeled 'A' and

87

Tri State Generation and Transmission Association Inc | Open Energy  

Open Energy Info (EERE)

Generation and Transmission Association Inc Generation and Transmission Association Inc Jump to: navigation, search Name Tri-State Generation and Transmission Association Inc Place Westminster, Colorado Zip 80234 Product A wholesale electric power asset operator and transmission grid. Coordinates 43.07212°, -72.465748° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.07212,"lon":-72.465748,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

88

Microsoft Word - TriCitiesMHQ_CX_2013  

Broader source: Energy.gov (indexed) [DOE]

Rudiger Krohn Rudiger Krohn Project Manager - TESF-CSB-2 Proposed Action: Tri-Cities Maintenance Headquarters Project Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.15 Support Buildings Location: Pasco, Franklin County, Washington T9N, R30E, Section 21 Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: BPA is proposing to build a maintenance headquarters facility (MHQ facility) on 18 acres in Franklin County, Washington. The site is located in Pasco, WA, in a fallow agricultural field that is zoned light industrial by the City of Pasco. The vegetation at the site consists of invasive weed species such as Russian thistle (Salsola tragus), tumble mustard (Sisymbrium altissimum), cheatgrass (Bromus tectorum) and tarweed (Madia spp.). The site is

89

Tri-County Electric Coop, Inc (Texas) | Open Energy Information  

Open Energy Info (EERE)

Inc (Texas) Inc (Texas) Jump to: navigation, search Name Tri-County Electric Coop, Inc Place Texas Utility Id 19159 Utility Location Yes Ownership C NERC Location TRE NERC ERCOT Yes ISO Ercot Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Service - Economic Development Commercial Cotton Gin Service Industrial Distributed Generation Facilities Less than 10MW (Over50KW and under 10MW) Commercial Distributed Generation Facilities Less than 10MW (50KW and smaller) Commercial General Service Single Phase Commercial General Service Three Phase Commercial

90

DOE - Office of Legacy Management -- Torrington Co - CT 09  

Office of Legacy Management (LM)

Alternate Name: Torrington Co. - Specialties Division CT.09-1 Location: Torrington , Connecticut CT.09-1 Evaluation Year: 1987 CT.09-1 Site Operations: Performed swaging...

91

Hanford Diversification and the Tri-Cities Economy FY 1999  

SciTech Connect (OSTI)

The missions of the U.S. Department of Energy's Richland Operations Office (DOE/RL) are to safely manage the Hanford Site, to manage and clean up its legacy wastes, and to develop and deploy new science and technology in the environmental and energy fields. Collectively, DOE/RL and its contractors are the most important single entity in the Tri-Cities local economy (Pasco, Kennewick, and Richland, Washington, and the surrounding area). Although the relevant economic region affected by DOE/RL and its contractors actually embraces a geographic area reaching from Yakima in the west to Walla Walla in the east and from Moses Lake in the north to Pendleton, Oregon, in the south, over 90% of economic impacts likely occur in Benton and Franklin Counties. These two counties are defined as the ''local'' Tri-Cities economy for purposes of this study. In the federal fiscal year (FY) 1999 (October 1, 1998 through September 30, 1999), the total impact of DOE'S local $1.59 billion budget was felt through payrolls of $542 million and local purchases of goods and services of $226 million. The total local spending of $768 million was up slightly from the FY 1998 total of $765 million. Taking into account the multiplier effects of this spending, the DOE/RL budget sustained an estimated 32% of all local employment (28,250 out of 88,100 jobs) and about 35% of local earned income (almost $1.08 billion out of $3.08 billion). The decrease in these percentages from last year's report reflects an update of the model's economic structure based on the 1997 economic census year, a correction of a programming error in the model found during the update, and a broader definition of earnings that includes proprietor income, not just wages (see the Appendix for revisions to the previous forecasts). DOE budget increases in FY 2000 are expected to result in no change to the number of local DOE contractor jobs and about a $29 million increase in direct local spending.

SCOTT, M.J.

2000-06-05T23:59:59.000Z

92

Hanford, diversification, and the Tri-Cities Economy FY 1998  

SciTech Connect (OSTI)

The missions of the U.S. Department of Energy's Richland Operations Office (DOE/RL) are to safely manage the Hanford Site, to manage and clean up its legacy wastes, and to develop and deploy new science and technology in the environmental and energy fields. Collectively, DOE/RL and its contractors are the most important single entity in the Tri-Cities local economy (Pasco, Kennewick, and Richland, Washington, and the surrounding area). Although the relevant economic region affected by DOE/RL and its contractors actually embraces a geographic area reaching from Yakima in the west to Walla Walla in the east and from Moses Lake in the north to Pendleton, Oregon, in the south, over 90% of economic impacts likely occur in Benton and Franklin Counties. These two counties are defined as the ''local'' Tri-Cities economy for purposes of this study (see Figure 1). In the federal fiscal year (IV) 1998 (October 1, 1997 through September 30, 1998), the total impact of DOEs local $1.6 billion budget was felt through payrolls of $519 million and local purchases of goods and services of $246 million. The total local spending of $765 million was down slightly from the FY 1997 total of $774 million. Taking into account the slightly greater multiplier effects of this spending due to changes in its mix, the DOE/RL budget sustained an estimated 36% of all local employment (31,200 out of 86,000 jobs) and up to 64% of local wage income ($1.55 billion out of $2.40 billion). This was up slightly from the year before (29,500 jobs, $1.49 billion income). DOE budget increases in FY 1999 are expected to result in a net increase of about 200 local DOE contractor jobs over the September 30, 1998 level, or about equal to the FY 1998 average. In addition, economic diversification more than offset the impact of the local DOE losses in FY 1998 and, together with an initial economic boost from privatization of Hanford's tank waste cleanup, is expected to play a significant expansive role in FY 1999. All of these positives, taken together with their multiplier effects, would directly or indirectly add a total 2,750 jobs and at least $135 million in income to the economy. However, agriculture and related regional services are expected to be weaker than in FY 1998, offsetting part of these gains. The overall net effect still is expected to be a net increase of 2,050 jobs and $86 million in wage income.

SCOTT, M.J.

1999-04-14T23:59:59.000Z

93

Radiation Exposure from CT Examinations in Japan  

Science Journals Connector (OSTI)

Computed tomography (CT) is the largest source of medical radiation exposure to the general population, and is ... assess the current situation of CT use in Japan, and to investigate variations in radiation expos...

Yoshito Tsushima; Ayako Taketomi-Takahashi; Hiroyuki Takei…

2010-11-01T23:59:59.000Z

94

TFC-0004 - In the Matter of Tri-Valley CARES | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

4 - In the Matter of Tri-Valley CARES 4 - In the Matter of Tri-Valley CARES TFC-0004 - In the Matter of Tri-Valley CARES Tri-Valley CARES filed an Appeal from a determination that the National Nuclear Security Administration (NNSA) issued on June 2, 2010. In that determination, NNSA denied in part a request for information that Tri-Valley CARES had submitted on September 8, 2008, pursuant to the Freedom of Information Act (FOIA), 5 U.S.C. § 552. NNSA withheld information that was responsive to the request after it determined that the information was protected from mandatory disclosure under two provisions of the FOIA. This Appeal, if granted, would require the DOE to release the portions of those documents responsive to Tri-Valley CARES's request that were withheld from disclosure due to their classified nature. The FOIA

95

Try-A Global Database of Plant Traits  

SciTech Connect (OSTI)

Plant traits the morphological, anatomical, physiological, biochemical and phenological characteristics of plants and their organs determine how primary producers respond to environmental factors, affect other trophic levels, influence ecosystem processes and services and provide a link from species richness to ecosystem functional diversity. Trait data thus represent the raw material for a wide range of research from evolutionary biology, community and functional ecology to biogeography. Here we present the global database initiative named TRY, which has united a wide range of the plant trait research community worldwide and gained an unprecedented buy-in of trait data: so far 93 trait databases have been contributed. The data repository currently contains almost three million trait entries for 69 000 out of the world s 300 000 plant species, with a focus on 52 groups of traits characterizing the vegetative and regeneration stages of the plant life cycle, including growth, dispersal, establishment and persistence. A first data analysis shows that most plant traits are approximately log-normally distributed, with widely differing ranges of variation across traits. Most trait variation is between species (interspecific), but significant intraspecific variation is also documented, up to 40% of the overall variation. Plant functional types (PFTs), as commonly used in vegetation models, capture a substantial fraction of the observed variation but for several traits most variation occurs within PFTs, up to 75% of the overall variation. In the context of vegetation models these traits would better be represented by state variables rather than fixed parameter values. The improved availability of plant trait data in the unified global database is expected to support a paradigm shift from species to trait-based ecology, offer new opportunities for synthetic plant trait research and enable a more realistic and empirically grounded representation of terrestrial vegetation in Earth system models.

Thornton, Peter E [ORNL

2011-01-01T23:59:59.000Z

96

Examination of Hydrate Formation Methods: Trying to Create Representative Samples  

SciTech Connect (OSTI)

Forming representative gas hydrate-bearing laboratory samples is important so that the properties of these materials may be measured, while controlling the composition and other variables. Natural samples are rare, and have often experienced pressure and temperature changes that may affect the property to be measured [Waite et al., 2008]. Forming methane hydrate samples in the laboratory has been done a number of ways, each having advantages and disadvantages. The ice-to-hydrate method [Stern et al., 1996], contacts melting ice with methane at the appropriate pressure to form hydrate. The hydrate can then be crushed and mixed with mineral grains under controlled conditions, and then compacted to create laboratory samples of methane hydrate in a mineral medium. The hydrate in these samples will be part of the load-bearing frame of the medium. In the excess gas method [Handa and Stupin, 1992], water is distributed throughout a mineral medium (e.g. packed moist sand, drained sand, moistened silica gel, other porous media) and the mixture is brought to hydrate-stable conditions (chilled and pressurized with gas), allowing hydrate to form. This method typically produces grain-cementing hydrate from pendular water in sand [Waite et al., 2004]. In the dissolved gas method [Tohidi et al., 2002], water with sufficient dissolved guest molecules is brought to hydrate-stable conditions where hydrate forms. In the laboratory, this is can be done by pre-dissolving the gas of interest in water and then introducing it to the sample under the appropriate conditions. With this method, it is easier to form hydrate from more soluble gases such as carbon dioxide. It is thought that this method more closely simulates the way most natural gas hydrate has formed. Laboratory implementation, however, is difficult, and sample formation is prohibitively time consuming [Minagawa et al., 2005; Spangenberg and Kulenkampff, 2005]. In another version of this technique, a specified quantity of gas is placed in a sample, then the sample is flooded with water and cooled [Priest et al., 2009]. We have performed a number of tests in which hydrate was formed and the uniformity of the hydrate formation was examined. These tests have primarily used a variety of modifications of the excess gas method to make the hydrate, although we have also used a version of the excess water technique. Early on, we found difficulties in creating uniform samples with a particular sand/ initial water saturation combination (F-110 Sand, {approx} 35% initial water saturation). In many of our tests we selected this combination intentionally to determine whether we could use a method to make the samples uniform. The following methods were examined: Excess gas, Freeze/thaw/form, Freeze/pressurize/thaw, Excess gas followed by water saturation, Excess water, Sand and kaolinite, Use of a nucleation enhancer (SnoMax), and Use of salt in the water. Below, each method, the underlying hypothesis, and our results are briefly presented, followed by a brief conclusion. Many of the hypotheses investigated are not our own, but were presented to us. Much of the data presented is from x-ray CT scanning our samples. The x-ray CT scanner provides a three-dimensional density map of our samples. From this map and the physics that is occurring in our samples, we are able to gain an understanding of the spatial nature of the processes that occur, and attribute them to the locations where they occur.

Kneafsey, T.J.; Rees, E.V.L.; Nakagawa, S.; Kwon, T.-H.

2011-04-01T23:59:59.000Z

97

World's First Tri-Generation Fuel Cell and Hydrogen Fueling Station  

Office of Energy Efficiency and Renewable Energy (EERE)

EERE supported the development of the world's first tri-generation station combined heat and power system that produces hydrogen in addition to heat and electricity.

98

CT Offshore | Open Energy Information  

Open Energy Info (EERE)

CT Offshore CT Offshore Place Otterup, Denmark Zip 5450 Sector Wind energy Product Denmark-based consultancy which provides assistance for project management, damage assessment and stabilization as well as other activities related to wind farms and subsea maintenance. Coordinates 55.543228°, 10.40294° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":55.543228,"lon":10.40294,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

99

Evaluation of Transit Operations: Data Applications of Tri-Met's Automated Bus Dispatching System  

E-Print Network [OSTI]

Evaluation of Transit Operations: Data Applications of Tri-Met's Automated Bus Dispatching System Dispatch System Tri-Met's BDS was installed in 1997 and became fully operational in 1998. Its main features Transportation System (APTS) technology has been motivated by transit providers' desire to improve service

Bertini, Robert L.

100

NNSA Small Business Week Day 3: Tri-State General Contracting Group, Inc. |  

National Nuclear Security Administration (NNSA)

3: Tri-State General Contracting Group, Inc. | 3: Tri-State General Contracting Group, Inc. | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > Media Room > Press Releases > NNSA Small Business Week Day 3: Tri-State ... Press Release NNSA Small Business Week Day 3: Tri-State General Contracting Group, Inc. Dec 15, 2010 Tri-State General Contracting Group, Inc. currently installing a HVAC

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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101

Dental CT: A New Diagnostic Tool in Dental Radiology Based on Double Spiral CT  

Science Journals Connector (OSTI)

In the beginning of 1990, dental computed tomography (CT) software program was developed which offers the possibility of reconstructing panoramic and transaxial images of the maxilla and the mandible from CT d...

U. Hirschfelder; H. Hirschfelder; J. Regn

1994-01-01T23:59:59.000Z

102

A new CT grading system for hip osteoarthritis  

E-Print Network [OSTI]

protocol and methodology and were then free to examine test cases over the next few weeks. A second meeting followed this familiarisation period to cover any questions on methodology. The first interpretation run was performed in a randomised order? #28... , and Doherty M. Radiographic patterns and associations of osteoarthritis of the hip. Ann Rheum Dis 1992;51(10):1111-6. 23. Solomon L, Schnitzler CM, and Browett JP. Osteoarthritis of the hip: the patient behind the disease. Ann Rheum Dis 1982...

Turmezei, T. D.; Fotiadou, A.; Lomas, D. J.; Hopper, M. A.; Poole, K. E. S.

2014-03-15T23:59:59.000Z

103

Limited View Angle Iterative CT Reconstruction  

E-Print Network [OSTI]

;Some Prior Literature in Limited View Tomography CT with limited-angle data and few views IRR algorithm Iterative Reconstruction-Reprojection (IRR) : An Algorithm for Limited Data Cardiac- Computed-views and limited-angle data in divergent-beam CT by E. Y. Sidky, CM Kao, and X. Pan (2006) Few-View Projection

104

Iran J Arthropod-Borne Dis, 2010, 4(2): 5660 A Nasiri et al.: Tick Infestation Rate of ... Short Communication  

E-Print Network [OSTI]

Iran J Arthropod-Borne Dis, 2010, 4(2): 56­60 A Nasiri et al.: Tick Infestation Rate of ... 56 Province, Iran, 2007-2008 A Nasiri1 , *Z Telmadarraiy1 , H Vatandoost1 , S Chinikar2 , M Moradi2 , MA of Public Health, Tehran University of Medical Sciences, Tehran, Iran 2 Pasteur Institute of Iran, Tehran

Paris-Sud XI, Université de

105

CT Solar Loan | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

CT Solar Loan CT Solar Loan CT Solar Loan < Back Eligibility Multi-Family Residential Residential Savings Category Solar Buying & Making Electricity Program Info State Connecticut Program Type State Loan Program Provider Sungage, Inc. The Clean Energy Finance and Investment Authority is offering a pilot loan program, CT Solar Loan, to provide homeowners with 15-year loans for solar PV equipment. The loans are administered through Sungage. Interested residents must apply online to be pre-qualified for the loan. Once the loan is in place, an approved installer files permits, order equipment, and installs the system on behalf of the resident. See the program web site for application materials. Source http://www.dsireusa.org/incentives/incentive.cfm?Incentive_Code=CT101F

106

Science.gov? Try ciencia.science.gov | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Science.gov? Try ciencia.science.gov Science.gov? Try ciencia.science.gov Science.gov? Try ciencia.science.gov October 15, 2012 - 10:10am Addthis Science.gov? Try ciencia.science.gov Dot Harris Dot Harris The Honorable Dot Harris, Director, Office of Economic Impact and Diversity If you laid out 200 million pieces of paper in a line, you'd travel the length of 508,000 football fields - which may give you some sense of the vastness of the amount of content that was translated into Spanish from science.gov this week. The 200 million pages of authoritative U.S. government science information can now be accessed on ciencia.science.gov, home of the Spanish version of research and development results from 17 organizations within 13 federal science agencies, 55 scientific databases, and 2,100 scientific websites.

107

TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. HEADQUARTERS: P.O  

Broader source: Energy.gov (indexed) [DOE]

TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. HEADQUARTERS: P.O . BOX 33695 DENVER, COLORADO 80233-0695 October 31, 2013 Ms. Julie A. Smith and Mr. Christopher Lawrence Office of Electricity Delivery and Energy Reliability (OE-20) U.S. Department of Energy 1000 Independence Avenue, SW Washington, DC 20585 Submitted electronically via email to : juliea.smith@hq.doe.gov and christopher.lawrence@hq.doe.gov 303-452-6111 Re: Department of Energy-Improving Performance of Federal Permitting and Review of Infrastructure Projects, Request for Information, 78 Fed. Reg. 53436 (Aug. 29, 2013) Dear Ms. Smith and Mr. Lawrence: Tri-State Generation and Transmission Assoc. , Inc. (Tri-State) appreciates the opportunity to provide comments regarding the proposed draft Integrated Interagency Pre-

108

Students try out PPPL plasma physics experiment that can be accessed...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Students try out PPPL plasma physics experiment that can be accessed from anywhere in the world By Jeanne Jackson DeVoe March 13, 2014 Tweet Widget Google Plus One Share on...

109

Students try out PPPL plasma physics experiment that can be accessed...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Primary tabs View(active tab) High Resolution News Students try out PPPL plasma physics experiment that can be accessed from anywhere in the world By Jeanne Jackson DeVoe March 13,...

110

FIA-14-0042- In the Matter of Tri-Valley CAREs  

Broader source: Energy.gov [DOE]

In May 2008, Tri-Valley CAREs submitted a revised FOIA request to the DOE for a document titled “B368 Select Agent Risk and Threat Assessment,” dated July 14, 2005.  Jan. 14, 2011, Determination...

111

Design and PHILS-based Transient Analysis of a Tri-axial HTS Power Cable  

Science Journals Connector (OSTI)

Abstract Tri-axial high-temperature superconducting (HTS) power cables are very efficient compared with other HTS power cables due to their reduced use of HTS wires and cryogenic surface area, resulting from the mutually layered structure of the three phases. However, the operating characteristics of tri-axial HTS power cables differ from other cables in a transient-state condition. In order to install HTS power cables in a real grid, feasibility verification through simulation or experimentation is required in advance. Thus, the authors design a tri-axial HTS power cable and implement a power hardware-in-the-loop simulation that consists of a real time digital simulator-based simulation model and hardware devices including a power supply and a 1 m-long tri-axial HTS model cable. Simulation results show the stability verification under steady-state and transient-state conditions.

Sun-Kyoung Ha; Chang-Soon Kim; Sung-Kyu Kim; Minh-Chau Dinh; Jin-Geun Kim; Minwon Park; In-Keun Yu; Sangjin Lee; Kideok Sim

2014-01-01T23:59:59.000Z

112

DOE - Office of Legacy Management -- New England Lime Co - CT...  

Office of Legacy Management (LM)

consideration under FUSRAP Designated Name: Not Designated Alternate Name: NELCO (Magnesium Division) CT.10-1 Location: Canaan , Connecticut CT.10-2 Evaluation Year: 1987...

113

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API  

E-Print Network [OSTI]

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API #12;pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API #12;pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API #12;pdfcrowd.comopen in browser PRO

114

Northeast - NY NJ CT PA Area | Open Energy Information  

Open Energy Info (EERE)

Northeast - NY NJ CT PA Area Northeast - NY NJ CT PA Area (Redirected from New York Area - NY NJ CT PA) Jump to: navigation, search Contents 1 Clean Energy Clusters in the Northeast - NY NJ CT PA Area 1.1 Products and Services in the Northeast - NY NJ CT PA Area 1.2 Research and Development Institutions in the Northeast - NY NJ CT PA Area 1.3 Networking Organizations in the Northeast - NY NJ CT PA Area 1.4 Investors and Financial Organizations in the Northeast - NY NJ CT PA Area 1.5 Policy Organizations in the Northeast - NY NJ CT PA Area Clean Energy Clusters in the Northeast - NY NJ CT PA Area Products and Services in the Northeast - NY NJ CT PA Area Loading map... {"format":"googlemaps3","type":"ROADMAP","types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":500,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"\u2026

115

Tri-party agreement databases, access mechanism and procedures. Revision 2  

SciTech Connect (OSTI)

This document contains the information required for the Washington State Department of Ecology (Ecology) and the U.S. Environmental Protection Agency (EPA) to access databases related to the Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement). It identifies the procedure required to obtain access to the Hanford Site computer networks and the Tri-Party Agreement related databases. It addresses security requirements, access methods, database availability dates, database access procedures, and the minimum computer hardware and software configurations required to operate within the Hanford Site networks. This document supersedes any previous agreements including the Administrative Agreement to Provide Computer Access to U.S. Environmental Protection Agency (EPA) and the Administrative Agreement to Provide Computer Access to Washington State Department of Ecology (Ecology), agreements that were signed by the U.S. Department of Energy (DOE), Richland Operations Office (RL) in June 1990, Access approval to EPA and Ecology is extended by RL to include all Tri-Party Agreement relevant databases named in this document via the documented access method and date. Access to databases and systems not listed in this document will be granted as determined necessary and negotiated among Ecology, EPA, and RL through the Tri-Party Agreement Project Managers. The Tri-Party Agreement Project Managers are the primary points of contact for all activities to be carried out under the Tri-Party Agreement. Action Plan. Access to the Tri-Party Agreement related databases and systems does not provide or imply any ownership on behalf of Ecology or EPA whether public or private of either the database or the system. Access to identified systems and databases does not include access to network/system administrative control information, network maps, etc.

Brulotte, P.J.

1996-01-01T23:59:59.000Z

116

Resonant Soft X-Ray Scattering of Tri-Block Copolymers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print In principle, tri-block copolymers (tri-BCPs), consisting of three chemically distinct polymers covalently joined together at the ends of each polymer chain, can serve as scaffolds and templates for fabricating a vast number of nanostructures. While quantitatively understanding the details of the morphology and the manner in which the different blocks interact with surfaces and interfaces is critical to success, previous experiments have been few. Now, an international team from the United States, Korea, and Japan has succeeded in combining resonant soft x-ray scattering (RSoXS) at ALS Beamline 11.0.1 with transmission electron microscopy tomography (TEMT) and other techniques to unambiguously determine morphologies comprising two nested hexagonally packed arrays of nanoscopic, cylindrical microdomains in the bulk and a core-shell nanostructure in a thin film. Not only has this work revealed a new phase of ABC tri-block copolymer with complicated morphology, it has illustrated the importance of RSoXS as a unique, powerful tool for examining complex, multi-component systems that could not be characterized with conventional methods.

117

Resonant Soft X-Ray Scattering of Tri-Block Copolymers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print In principle, tri-block copolymers (tri-BCPs), consisting of three chemically distinct polymers covalently joined together at the ends of each polymer chain, can serve as scaffolds and templates for fabricating a vast number of nanostructures. While quantitatively understanding the details of the morphology and the manner in which the different blocks interact with surfaces and interfaces is critical to success, previous experiments have been few. Now, an international team from the United States, Korea, and Japan has succeeded in combining resonant soft x-ray scattering (RSoXS) at ALS Beamline 11.0.1 with transmission electron microscopy tomography (TEMT) and other techniques to unambiguously determine morphologies comprising two nested hexagonally packed arrays of nanoscopic, cylindrical microdomains in the bulk and a core-shell nanostructure in a thin film. Not only has this work revealed a new phase of ABC tri-block copolymer with complicated morphology, it has illustrated the importance of RSoXS as a unique, powerful tool for examining complex, multi-component systems that could not be characterized with conventional methods.

118

Resonant Soft X-Ray Scattering of Tri-Block Copolymers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print In principle, tri-block copolymers (tri-BCPs), consisting of three chemically distinct polymers covalently joined together at the ends of each polymer chain, can serve as scaffolds and templates for fabricating a vast number of nanostructures. While quantitatively understanding the details of the morphology and the manner in which the different blocks interact with surfaces and interfaces is critical to success, previous experiments have been few. Now, an international team from the United States, Korea, and Japan has succeeded in combining resonant soft x-ray scattering (RSoXS) at ALS Beamline 11.0.1 with transmission electron microscopy tomography (TEMT) and other techniques to unambiguously determine morphologies comprising two nested hexagonally packed arrays of nanoscopic, cylindrical microdomains in the bulk and a core-shell nanostructure in a thin film. Not only has this work revealed a new phase of ABC tri-block copolymer with complicated morphology, it has illustrated the importance of RSoXS as a unique, powerful tool for examining complex, multi-component systems that could not be characterized with conventional methods.

119

Resonant Soft X-Ray Scattering of Tri-Block Copolymers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print In principle, tri-block copolymers (tri-BCPs), consisting of three chemically distinct polymers covalently joined together at the ends of each polymer chain, can serve as scaffolds and templates for fabricating a vast number of nanostructures. While quantitatively understanding the details of the morphology and the manner in which the different blocks interact with surfaces and interfaces is critical to success, previous experiments have been few. Now, an international team from the United States, Korea, and Japan has succeeded in combining resonant soft x-ray scattering (RSoXS) at ALS Beamline 11.0.1 with transmission electron microscopy tomography (TEMT) and other techniques to unambiguously determine morphologies comprising two nested hexagonally packed arrays of nanoscopic, cylindrical microdomains in the bulk and a core-shell nanostructure in a thin film. Not only has this work revealed a new phase of ABC tri-block copolymer with complicated morphology, it has illustrated the importance of RSoXS as a unique, powerful tool for examining complex, multi-component systems that could not be characterized with conventional methods.

120

Resonant Soft X-Ray Scattering of Tri-Block Copolymers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resonant Soft X-Ray Scattering Resonant Soft X-Ray Scattering of Tri-Block Copolymers Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print Wednesday, 30 May 2012 00:00 In principle, tri-block copolymers (tri-BCPs), consisting of three chemically distinct polymers covalently joined together at the ends of each polymer chain, can serve as scaffolds and templates for fabricating a vast number of nanostructures. While quantitatively understanding the details of the morphology and the manner in which the different blocks interact with surfaces and interfaces is critical to success, previous experiments have been few. Now, an international team from the United States, Korea, and Japan has succeeded in combining resonant soft x-ray scattering (RSoXS) at ALS Beamline 11.0.1 with transmission electron microscopy tomography (TEMT) and other techniques to unambiguously determine morphologies comprising two nested hexagonally packed arrays of nanoscopic, cylindrical microdomains in the bulk and a core-shell nanostructure in a thin film. Not only has this work revealed a new phase of ABC tri-block copolymer with complicated morphology, it has illustrated the importance of RSoXS as a unique, powerful tool for examining complex, multi-component systems that could not be characterized with conventional methods.

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Toxics Release Inventory Expansion Rule Phase 3 (TRI-P3)  

SciTech Connect (OSTI)

The ORR [East Tennessee Technology Park (ETTP), Y-12 Plant, and Oak Ridge National Laboratory (ORNL)] is considered a single facility for reporting by the DOE prime contractors. The processing, manufacturing, or "otherwise use" Section313 chemicals are combined to determine TRI reportability. Such is the case with lead metal, which is one of two chemicals for which reportin~ forms were prepared in this pilot study (Task 2;1. The lead shop at ORNL exceeded the reporting threshold, causing a lead activity at a Y-1 2 machine shop and lead in waste at ETTP to be reportable. TRI-P3 report preparation time for lead totaled 36.5 hours. The second chemical investigated and reported (chromium) also required nearly a man-week for report preparation and documentation by experienced TRI personnel. The ORR TRI report typically includes about six chemicals, so an estimate of the TRI-P3 incremental reporting burden for ORR would be six weeks for experienced personnel axI d two/three man-months for first-time ORR preparers.

Evans, R.A.; Saunders, A.D.; Worley, G.G.

1998-09-01T23:59:59.000Z

122

Resonant Soft X-Ray Scattering of Tri-Block Copolymers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print Resonant Soft X-Ray Scattering of Tri-Block Copolymers Print In principle, tri-block copolymers (tri-BCPs), consisting of three chemically distinct polymers covalently joined together at the ends of each polymer chain, can serve as scaffolds and templates for fabricating a vast number of nanostructures. While quantitatively understanding the details of the morphology and the manner in which the different blocks interact with surfaces and interfaces is critical to success, previous experiments have been few. Now, an international team from the United States, Korea, and Japan has succeeded in combining resonant soft x-ray scattering (RSoXS) at ALS Beamline 11.0.1 with transmission electron microscopy tomography (TEMT) and other techniques to unambiguously determine morphologies comprising two nested hexagonally packed arrays of nanoscopic, cylindrical microdomains in the bulk and a core-shell nanostructure in a thin film. Not only has this work revealed a new phase of ABC tri-block copolymer with complicated morphology, it has illustrated the importance of RSoXS as a unique, powerful tool for examining complex, multi-component systems that could not be characterized with conventional methods.

123

DOE - Office of Legacy Management -- American Brass Co - CT 01  

Office of Legacy Management (LM)

Brass Co - CT 01 Brass Co - CT 01 FUSRAP Considered Sites Site: American Brass Co (CT.01 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: Anaconda Company Brass Division CT.01-1 Location: 414 Meadow Street , Waterbury , Connecticut CT.01-1 Evaluation Year: 1986 CT.01-2 Site Operations: Limited work with copper clad uranium billets during the 1950s. CT.01-1 Site Disposition: Eliminated - Potential for contamination considered remote based upon the limited scope of activities at the site CT.01-2 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium CT.01-3 Radiological Survey(s): Yes - health and safety monitoring during operations only CT.01-3 Site Status: Eliminated from consideration under FUSRAP

124

DOE - Office of Legacy Management -- Fenn Machinery Co - CT 11  

Office of Legacy Management (LM)

Fenn Machinery Co - CT 11 Fenn Machinery Co - CT 11 FUSRAP Considered Sites Site: Fenn Machinery Co. (CT.11 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: New Britain , Connecticut CT.11-1 Evaluation Year: 1987 CT.11-1 Site Operations: Performed short-term tests on small quantities of uranium metal to explore potential for swaging, circa mid-1950 CT.11-1 CT.11-3 Site Disposition: Eliminated - Potential for contamination considered remote due to limited scope of activities and relatively small quantities of radioactive material used CT.11-1 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium CT.11-3 Radiological Survey(s): None Indicated Site Status: Eliminated from consideration under FUSRAP CT.11-2

125

Northeast - NY NJ CT PA Area | Open Energy Information  

Open Energy Info (EERE)

Northeast - NY NJ CT PA Area Northeast - NY NJ CT PA Area Jump to: navigation, search Contents 1 Clean Energy Clusters in the Northeast - NY NJ CT PA Area 1.1 Products and Services in the Northeast - NY NJ CT PA Area 1.2 Research and Development Institutions in the Northeast - NY NJ CT PA Area 1.3 Networking Organizations in the Northeast - NY NJ CT PA Area 1.4 Investors and Financial Organizations in the Northeast - NY NJ CT PA Area 1.5 Policy Organizations in the Northeast - NY NJ CT PA Area Clean Energy Clusters in the Northeast - NY NJ CT PA Area Products and Services in the Northeast - NY NJ CT PA Area Loading map... {"format":"googlemaps3","type":"ROADMAP","types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":500,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"\u2026

126

Tri-fold - Agencies Assisting with EEOICPA and the Former worker Program |  

Broader source: Energy.gov (indexed) [DOE]

Information Center » Worker » Former Worker Program » Tri-fold - Information Center » Worker » Former Worker Program » Tri-fold - Agencies Assisting with EEOICPA and the Former worker Program Tri-fold - Agencies Assisting with EEOICPA and the Former worker Program January 2014 Agencies Assisting with EEOICPA and the Former Worker Program FWP provides no-cost medical screenings to all former DOE Federal, contractor, and subcontractor employees. The screening focuses on the early detection of health conditions that may be related to occupational exposures such as beryllium, asbestos, radiation, silica, etc. Medical screenings include a physical exam, hearing test, Medical screenings include a physical exam, hearing test, blood and urine tests, and other special tests depending on the individual's work and exposure history.

127

Want to Finance a Wind Farm Project in Your Community? Try Crowdfunding |  

Broader source: Energy.gov (indexed) [DOE]

Want to Finance a Wind Farm Project in Your Community? Try Want to Finance a Wind Farm Project in Your Community? Try Crowdfunding Want to Finance a Wind Farm Project in Your Community? Try Crowdfunding September 24, 2013 - 10:12am Addthis A wind turbine is installed at the Crow Lake Wind project, just east of Chamberlain, S.D. | Photo Courtesy of East River Electric Power Cooperative A wind turbine is installed at the Crow Lake Wind project, just east of Chamberlain, S.D. | Photo Courtesy of East River Electric Power Cooperative The Crow Lake Wind project is the largest cooperative-owned wind project in the United States. | Photo Courtesy of East River Electric Power Cooperative The Crow Lake Wind project is the largest cooperative-owned wind project in the United States. | Photo Courtesy of East River Electric Power

128

Tri-City Herald: Japanese Officials See How Hanford Does It | Department of  

Broader source: Energy.gov (indexed) [DOE]

Tri-City Herald: Japanese Officials See How Hanford Does It Tri-City Herald: Japanese Officials See How Hanford Does It Tri-City Herald: Japanese Officials See How Hanford Does It January 18, 2013 - 12:00pm Addthis Tokyo Electric Power Company officials tour the Hanford Site to learn about cleanup technologies that could be used at Fukushima. Tokyo Electric Power Company officials tour the Hanford Site to learn about cleanup technologies that could be used at Fukushima. On opposite sides of the Pacific Ocean, similar work to clean up radioactive contamination is planned to be carried out during the next 40 years. Thursday, officials from the Tokyo Electric Power Co., the utility that operated the Fukushima, Japan, nuclear reactors, toured Hanford to see how work is being done there to clean up contamination from the past production

129

Want to Finance a Wind Farm Project in Your Community? Try Crowdfunding |  

Broader source: Energy.gov (indexed) [DOE]

Want to Finance a Wind Farm Project in Your Community? Try Want to Finance a Wind Farm Project in Your Community? Try Crowdfunding Want to Finance a Wind Farm Project in Your Community? Try Crowdfunding September 24, 2013 - 10:12am Addthis A wind turbine is installed at the Crow Lake Wind project, just east of Chamberlain, S.D. | Photo Courtesy of East River Electric Power Cooperative A wind turbine is installed at the Crow Lake Wind project, just east of Chamberlain, S.D. | Photo Courtesy of East River Electric Power Cooperative The Crow Lake Wind project is the largest cooperative-owned wind project in the United States. | Photo Courtesy of East River Electric Power Cooperative The Crow Lake Wind project is the largest cooperative-owned wind project in the United States. | Photo Courtesy of East River Electric Power

130

Russia Tri-Lab S&T Collaborations | National Nuclear Security  

National Nuclear Security Administration (NNSA)

Russia Tri-Lab S&T Collaborations | National Nuclear Security Russia Tri-Lab S&T Collaborations | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog The National Nuclear Security Administration Russia Tri-Lab S&T Collaborations Home > About Us > Our Programs > Defense Programs > Future Science & Technology Programs > Office of Advanced Simulation and Computing and

131

Fuel Cell Tri-Generation System Case Study using the H2A Stationary Model  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Fuel Cell Tri-Generation System Case Fuel Cell Tri-Generation System Case Study using the H2A Stationary Model Darlene Steward/ Mike Penev National Renewable Energy Laboratory Integrated Stationary Power and Transportation Workshop Phoenix, Arizona October 27, 2008 National Renewable Energy Laboratory Innovation for Our Energy Future 2 Introduction Goal: Develop a cost analysis tool that will be flexible and comprehensive enough to realistically analyze a wide variety of potential combined heat and power/hydrogen production scenarios Approach: Rely on the H2A discounted cash flow methodology to develop a new stationary systems model With the help of industry partners, develop and analyze a range of realistic case studies for tri-generation systems. National Renewable Energy Laboratory Innovation for Our Energy Future

132

DOE - Office of Legacy Management -- Sperry Products Inc - CT 07  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sperry Products Inc - CT 07 Sperry Products Inc - CT 07 FUSRAP Considered Sites Site: SPERRY PRODUCTS, INC. (CT.07) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: Danbury , Connecticut CT.07-1 Evaluation Year: 1994 CT.07-2 Site Operations: Performed tests involving non-destructive inspection techniques in the 1950s. CT.07-3 Site Disposition: Eliminated - Potential for contamination considered remote based on the limited scope of activities performed at the site CT.07-2 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium CT.07-3 Radiological Survey(s): No Site Status: Eliminated from consideration under FUSRAP Also see Documents Related to SPERRY PRODUCTS, INC. CT.07-1 - Sperry Products Letter; VanValkenburg to DeRenzis;

133

DOE - Office of Legacy Management -- American Cyanamid Co - CT 13  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cyanamid Co - CT 13 Cyanamid Co - CT 13 FUSRAP Considered Sites Site: American Cyanamid Co (CT.13 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: Stamford , Connecticut CT.13-1 Evaluation Year: 1987 CT.13-1 Site Operations: Produced boron and possibly handled small amounts of refined radioactive source material circa 1940's. Also possibly performed research work on irradiated "J" slugs in 1952 and 1953. CT.13-1 CT.13-3 Site Disposition: Eliminated - Potential for contamination considered remote due to the limited scope of activities involving radioactive material performed at this site CT.13-2 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium CT.13-1 Radiological Survey(s): No

134

TRI-M]AL ELECTRIC FIELD I'MASIJRN$NTS FOR DETERMII.IINGDEEP OCEANWATERMOTIONS  

E-Print Network [OSTI]

TRI-M]AL ELECTRIC FIELD I'MASIJRN$NTS FOR DETERMII.IINGDEEP OCEANWATERMOTIONS: TECHNIQUESAND A PREL OF THE by G e o r g e H . S u t t o n #12;I \\ t ABSTRACT Deep ocean electric field neasureEents provide information on oceanic water uotions and on the electrical conductivity sEructure of the earthrs crust

Luther, Douglas S.

135

Tri-Met's Experience With Automatic Passenger Counter and Automatic Vehicle Location Systems  

E-Print Network [OSTI]

Tri-Met's Experience With Automatic Passenger Counter and Automatic Vehicle Location Systems James includes Automatic Vehicle Location (AVL) using a satellite-based global positioning system (GPS); · Voice for temporary data storage, a vehicle control head displaying schedule adherence to operators, detection

Bertini, Robert L.

136

What is your field of study? Why? _____________ ,.. What are you trying to achieve?  

E-Print Network [OSTI]

Name:~ ~ What is your field of study? Why? _____________ ,.. What are you trying to achieve? l- I- ~~ --to ~ ~ ~..,-t---I ~~--~-~~W~--~~~~----~ ~ -F ~ ~flII~U..!.------------- What are your research interests and in what areas have you published? ,"I~rrI ~.~..,. ~...~ · ~ What are your strengths and skills

Watson, Craig A.

137

Analysis of a Third-Generation Princeton Tri-leaflet Mechanical Heart Valve  

E-Print Network [OSTI]

Analysis of a Third-Generation Princeton Tri-leaflet Mechanical Heart Valve Michael Hsu Advisor heart valve · Static analysis of leaflet under uniform pressure of 10 MPa Summer Objectives · Find Heart valve disease · Over 5 million affected · Over 225,000 valve- replacement surgeries performed

Petta, Jason

138

How to search resources If you are looking for an article, try  

E-Print Network [OSTI]

in the search box. -You can also perform an advanced search on Google scholar by clicking on `Advanced Scholar to title or author by using `Advanced Scholar Search'. Searching for articles at MHow to search resources If you are looking for an article, try: Google Scholar: This search engine

McPhee-Shaw, Erika

139

Kinetic evaluation of the tri-reforming process of methane for syngas production  

Science Journals Connector (OSTI)

The conversion of natural gas was carried out via tri-reforming of methane in a fixed bed reactor employing a Ni/?-Al2O3 catalyst. The kinetic evaluations were performed in a temperature range from 923 to 1,123 K...

Leonardo J. L. Maciel…

2010-12-01T23:59:59.000Z

140

Arabidopsis TTG2 Regulates TRY Expression through Enhancement of Activator Complex-Triggered Activation  

Science Journals Connector (OSTI)

...figures in this article are displayed in color online but in black and white in the print edition. [W] Online version contains Web-only data. The WRKY protein TTG2 is shown to be essential for the activation of the trichome-patterning gene TRY. TTG2...

Martina Pesch; Burcu Dartan; Rainer Birkenbihl; Imre E. Somssich; Martin Hülskamp

2014-10-10T23:59:59.000Z

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

The Nova-Likes Ac Cnc, Rw Tri, Ux Uma and the Nova Dq Her: Common and Different Properties  

Science Journals Connector (OSTI)

An analysis of the main photometric properties of the nova-like variables AC Cnc, RW Tri and UX UMa, and...

E. S. Dmitrienko

1996-01-01T23:59:59.000Z

142

Trapping volumetric measurement by multidetector CT in chronic obstructive pulmonary disease: Effect of CT threshold  

SciTech Connect (OSTI)

Purpose: The purpose of this study was to evaluate the effect of various computed tomography (CT) thresholds on trapping volumetric measurements by multidetector CT in chronic obstructive pulmonary disease (COPD).Methods: Twenty-three COPD patients were scanned with a 64-slice CT scanner in both the inspiratory and expiratory phase. CT thresholds of ?950 Hu in inspiration and ?950 to ?890 Hu in expiration were used, after which trapping volumetric measurements were made using computer software. Trapping volume percentage (Vtrap%) under the different CT thresholds in the expiratory phase and below ?950 Hu in the inspiratory phase was compared and correlated with lung function.Results: Mean Vtrap% was similar under ?930 Hu in the expiratory phase and below ?950 Hu in the inspiratory phase, being 13.18 ± 9.66 and 13.95 ± 6.72 (both lungs), respectively; this difference was not significant (P= 0.240). Vtrap% under ?950 Hu in the inspiratory phase and below the ?950 to ?890 Hu threshold in the expiratory phase was moderately negatively correlated with the ratio of forced expiratory volume in one second to forced vital capacity and the measured value of forced expiratory volume in one second as a percentage of the predicted value.Conclusions: Trapping volumetric measurement with multidetector CT is a promising method for the quantification of COPD. It is important to know the effect of various CT thresholds on trapping volumetric measurements.

Wang, Xiaohua; Yuan, Huishu [Department of Radiology, Peking University Third Hospital, Beijing 100191 (China)] [Department of Radiology, Peking University Third Hospital, Beijing 100191 (China); Duan, Jianghui [Medical School, Peking University, Beijing 100191 (China)] [Medical School, Peking University, Beijing 100191 (China); Du, Yipeng; Shen, Ning; He, Bei [Department of Respiration Internal Medicine, Peking University Third Hospital, Beijing 100191 (China)] [Department of Respiration Internal Medicine, Peking University Third Hospital, Beijing 100191 (China)

2013-08-15T23:59:59.000Z

143

DOE - Office of Legacy Management -- Wesleyan University - CT 12  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Wesleyan University - CT 12 Wesleyan University - CT 12 FUSRAP Considered Sites Site: Wesleyan University (CT.12 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: Middletown , Connecticut CT.12-1 Evaluation Year: 1995 CT.12-2 Site Operations: Spectrographic research on small quantities of uranium wire (several inches in length) in Physics Department circa late 1950. CT.12-1 Site Disposition: Eliminated - Potential for contamination considered remote due to the limited scope of activities performed CT.12-2 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium CT.12-1 Radiological Survey(s): No Site Status: Eliminated from consideration under FUSRAP Also see Documents Related to Wesleyan University

144

Effect of magnetic reconnection on CT penetration into magnetized plasmas  

Science Journals Connector (OSTI)

To understand the fuelling process in a fusion device by a compact toroid (CT) injection method, three dimensional MHD numerical simulations, where a spheromak-like CT (SCT) is injected into...

Yoshio Suzuki; Takaya Hayashi; Yasuaki Kishimoto

2001-06-01T23:59:59.000Z

145

DOE - Office of Legacy Management -- New Canaan Site - CT 08  

Office of Legacy Management (LM)

FUSRAP Designated Name: Not Designated Alternate Name: None Location: New Canaan , Connecticut CT.08-1 Evaluation Year: 1985 CT.08-2 Site Operations: None; Investigation of area...

146

High Temperature Fuel Cell Tri-Generation of Power, Heat & H2 from Biogas  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

National Fuel Cell Research Center, 2012 1/22 National Fuel Cell Research Center, 2012 1/22 High Temperature Fuel Cell Tri-Generation of Power, Heat & H 2 from Biogas Jack Brouwer, Ph.D. June 19, 2012 DOE/ NREL Biogas Workshop - Golden, CO © National Fuel Cell Research Center, 2012 2/22 Outline * Introduction and Background * Tri-Generation/Poly-Generation Analyses * OCSD Project Introduction © National Fuel Cell Research Center, 2012 3/22 Introduction and Background * Hydrogen fuel cell vehicle performance is outstanding * Energy density of H 2 is much greater than batteries * Rapid fueling, long range ZEV * H 2 must be produced * energy intensive, may have emissions, fossil fuels, economies of scale * Low volumetric energy density of H 2 compared to current infrastructure fuels (@ STP)

147

General Geometry CT Reconstruction Alexei Ramotar  

E-Print Network [OSTI]

, reconstruction, Filtered Back Projection Submitted to IPCV'06 Abstract We present an efficient and accurate acquired by a parallel-beam CT scanner. Once in that form, Filtered Back Projection can be used to perform technology that uses many small x-ray images to reconstruct a view of the internal structures of an object

Orchard, Jeffery J.

148

Tri-trophic Analyses of Rice, the Sugarcane Borer, and Putative Biological Control Agents  

E-Print Network [OSTI]

Michael O. Way Head of Department, Kevin M. Heinz December 2008 Major Subject: Entomology iii ABSTRACT Tri-trophic Analyses of Rice, the Sugarcane Borer, and Putative Biological Control Agents. (December 2008) Jiale Lv, B.S., Fudan... instar and b) survival from the end of the 1 st instar to the early 3 rd instar....................................................................................................... 23 2.2 The impact of density on sugarcane borer injury (x? 1/2 C...

Lv, Jiale

2010-01-14T23:59:59.000Z

149

Reverse osmosis performance with solutions containing tri-n-butyl phosphate  

SciTech Connect (OSTI)

Tests were conducted to determine whether the reverse osmosis (RO) units at the F/H Effluent Treatment Facility (ETF) at the Savannah River could be made to process solutions containing tri-n-butyl phosphate (TBP). It was desired to test whether operation at a feed pH other than neutral would improve performance. Test results are discussed in this report and indicate that little improvement in the water flux can be expected at other pH values.

Siler, J.L.

1991-10-22T23:59:59.000Z

150

My Generation--The Who People try to put us d-down  

E-Print Network [OSTI]

My Generation--The Who Intro: G F People try to put us d-down G F G(once) Talkin' 'bout my generation Just because we get around G F G(once) Talkin' 'bout my generation Things they do look awful cold G F G(once) Talkin' 'bout my generation I hope I die before I get old G F G(once) Talkin' 'bout my

Reiners, Peter W.

151

RADIATION EXPOSURE DURING PAEDIATRIC CT IN SUDAN: CT DOSE, ORGAN AND EFFECTIVE DOSES  

Science Journals Connector (OSTI)

......research-article Paper RADIATION EXPOSURE DURING PAEDIATRIC...Energy Commission, Radiation Safety Institute, PO Box 3001...assess the magnitude of radiation exposure during paediatric...CT-Expo 2.1 dosimetry software. Doses were evaluated......

I. I. Suliman; H. M. Khamis; T. H. Ombada; K. Alzimami; M. Alkhorayef; A. Sulieman

2014-11-01T23:59:59.000Z

152

ASPEN modeling of the Tri-State indirect-liquefaction process  

SciTech Connect (OSTI)

The ASPEN process simulator has been used to model an indirect-liquefaction flowsheet patterned after that of the Tri-State project. This flowsheet uses Lurgi moving-bed gasification with synthesis-gas conversion to methanol folowed by further processing to gasoline using the Mobil MTG process. Models developed in this study include the following: Lurgi gasifier, Texaco gasifier, synthesis gas cooling, Rectisol, methanol synthesis, methanol-to-gasoline, CO-shift, methanation, and naphtha hydrotreating. These models have been successfully developed in modular form so that they can be used to simulate a number of different flowsheets or process alternatives. Simulations of the Tri-State flowsheet have been made using two different coal-feed rates and two types of feed coal. The overall simulation model was adjusted to match the Tri-State flowsheet values for methanol, LPG, isobutane, and gasoline. As a result of this adjustment, the MTG reactor yield structure necessary to match the flowsheet product rates was determined. The models were exercised at different flow rates and were unaffected by such changes, demonstrating their range of operability. The use of Illinois No. 6 coal, with its lower ash content, resulted in slightly higher production rates of each of the products as compared to use of the Kentucky coal.

Barker, R.E.; Begovich, J.M.; Clinton, J.H.; Johnson, P.J.

1983-10-01T23:59:59.000Z

153

Auto-DR and Pre-cooling of Buildings at Tri-City Corporate Center  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Auto-DR and Pre-cooling of Buildings at Tri-City Corporate Center Auto-DR and Pre-cooling of Buildings at Tri-City Corporate Center Title Auto-DR and Pre-cooling of Buildings at Tri-City Corporate Center Publication Type Report LBNL Report Number LBNL-3348e Year of Publication 2008 Authors Yin, Rongxin, Peng Xu, and Sila Kiliccote Keywords auto-dr, building energy simulation tool, demand response, demand shifting (pre-cooling), DRQAT, market sectors, pre-cooling, technologies, testbed tools and guides, thermal mass Abstract Over the several past years, Lawrence Berkeley National Laboratory (LBNL) has conducted field tests for different pre-cooling strategies in different commercial buildings within California. The test results indicated that pre-cooling strategies were effective in reducing electric demand in these buildings during peak periods. This project studied how to optimize pre-cooling strategies for eleven buildings in the Tri-City Corporate Center, San Bernardino, California with the assistance of a building energy simulation tool - the Demand Response Quick Assessment Tool (DRQAT) developed by LBNL's Demand Response Research Center funded by the California Energy Commission's Public Interest Energy Research (PIER) Program. From the simulation results of these eleven buildings, optimal pre-cooling and temperature reset strategies were developed. The study shows that after refining and calibrating initial models with measured data, the accuracy of the models can be greatly improved and the models can be used to predict load reductions for automated demand response (Auto-DR) events. This study summarizes the optimization experience of the procedure to develop and calibrate building models in DRQAT. In order to confirm the actual effect of demand response strategies, the simulation results were compared to the field test data. The results indicated that the optimal demand response strategies worked well for all buildings in the Tri-City Corporate Center. This study also compares DRQAT with other building energy simulation tools (eQUEST and BEST). The comparison indicate that eQUEST and BEST underestimate the actual demand shed of the pre-cooling strategies due to a flaw in DOE2's simulation engine for treating wall thermal mass. DRQAT is a more accurate tool in predicting thermal mass effects of DR events.

154

Implications of CT noise and artifacts for quantitative {sup 99m}Tc SPECT/CT imaging  

SciTech Connect (OSTI)

Purpose: This paper evaluates the effects of computed tomography (CT) image noise and artifacts on quantitative single-photon emission computed-tomography (SPECT) imaging, with the aim of establishing an appropriate range of CT acquisition parameters for low-dose protocols with respect to accurate SPECT attenuation correction (AC). Methods: SPECT images of two geometric and one anthropomorphic phantom were reconstructed iteratively using CT scans acquired at a range of dose levels (CTDI{sub vol} = 0.4 to 46 mGy). Resultant SPECT image quality was evaluated by comparing mean signal, background noise, and artifacts to SPECT images reconstructed using the highest dose CT for AC. Noise injection was performed on linear-attenuation (?) maps to determine the CT noise threshold for accurate AC. Results: High levels of CT noise (? ? 200–400 HU) resulted in low ?-maps noise (? ? 1%–3%). Noise levels greater than ?10% in 140 keV ?-maps were required to produce visibly perceptible increases of ?15% in {sup 99m}Tc SPECT images. These noise levels would be achieved at low CT dose levels (CTDI{sub vol} = 4 ?Gy) that are over 2 orders of magnitude lower than the minimum dose for diagnostic CT scanners. CT noise could also lower (bias) the expected ? values. The relative error in reconstructed SPECT signal trended linearly with the relative shift in ?. SPECT signal was, on average, underestimated in regions corresponding with beam-hardening artifacts in CT images. Any process that has the potential to change the CT number of a region by ?100 HU (e.g., misregistration between CT images and SPECT images due to motion, the presence of contrast in CT images) could introduce errors in ?{sub 140} {sub keV} on the order of 10%, that in turn, could introduce errors on the order of ?10% into the reconstructed {sup 99m}Tc SPECT image. Conclusions: The impact of CT noise on SPECT noise was demonstrated to be negligible for clinically achievable CT parameters. Because CT dose levels that affect SPECT quantification is low (CTDI{sub vol} ? 4 ?Gy), the low dose limit for the CT exam as part of SPECT/CT will be guided by CT image quality requirements for anatomical localization and artifact reduction. A CT technique with higher kVp in combination with lower mAs is recommended when low-dose CT images are used for AC to minimize beam-hardening artifacts.

Hulme, K. W.; Kappadath, S. C., E-mail: skappadath@mdanderson.org [Department of Imaging Physics, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030 and The University of Texas Graduate School of Biomedical Sciences, Houston, Texas 77030 (United States)

2014-04-15T23:59:59.000Z

155

1-nm-thick graphene tri-layer as the ultimate copper diffusion barrier  

SciTech Connect (OSTI)

We demonstrate the thinnest ever reported Cu diffusion barrier, a 1-nm-thick graphene tri-layer. X-ray diffraction patterns and Raman spectra show that the graphene is thermally stable at up to 750?°C against Cu diffusion. Transmission electron microscopy images show that there was no inter-diffusion in the Cu/graphene/Si structure. Raman analyses indicate that the graphene may have degraded into a nanocrystalline structure at 750?°C. At 800?°C, the perfect carbon structure was damaged, and thus the barrier failed. The results of this study suggest that graphene could be the ultimate Cu interconnect diffusion barrier.

Nguyen, Ba-Son [Department of Mechanical Engineering, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan (China); Lin, Jen-Fin [Department of Mechanical Engineering, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan (China); Center for Micro/Nano Science and Technology, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan (China); Perng, Dung-Ching, E-mail: dcperng@ee.ncku.edu.tw [Institute of Microelectronics and Electrical Engineering Department, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan (China); Center for Micro/Nano Science and Technology, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan (China)

2014-02-24T23:59:59.000Z

156

Kinetic study of the interaction of hydroxide ions with some tri- and tetrasubstituted nitronaphthalenes  

E-Print Network [OSTI]

nitrite was assayed by pipeting 50. 00 ml of standard 0. 100N potassium permanganate, 5 ml of 1:5 sulfuric acid, and 25. 00 ml of approximately 0. 1 N sodium nitrite solution (3. 45 g per liter) into a glass-stoppered f'lask. The stoppered flask...'our nitrosubstituted i-iapi", , na", enes, 1 . . =, 5 i8- tetr?-, 1 4 . 5 . , 8-tet ra , i, 3, 8-tri - and 1, 4, 5- r i nl t' , onaphii'ial E. , ', s, w re s * u '. ", ihi . ' '"ors ' ants for formation and oecomposstion of tne interiiiediate Meiscnneirier...

Liu, Li-jen

1974-01-01T23:59:59.000Z

157

CT volumetry of the skeletal tissues  

SciTech Connect (OSTI)

Computed tomography (CT) is an important and widely used modality in the diagnosis and treatment of various cancers. In the field of molecular radiotherapy, the use of spongiosa volume (combined tissues of the bone marrow and bone trabeculae) has been suggested as a means to improve the patient-specificity of bone marrow dose estimates. The noninvasive estimation of an organ volume comes with some degree of error or variation from the true organ volume. The present study explores the ability to obtain estimates of spongiosa volume or its surrogate via manual image segmentation. The variation among different segmentation raters was explored and found not to be statistically significant (p value >0.05). Accuracy was assessed by having several raters manually segment a polyvinyl chloride (PVC) pipe with known volumes. Segmentation of the outer region of the PVC pipe resulted in mean percent errors as great as 15% while segmentation of the pipe's inner region resulted in mean percent errors within {approx}5%. Differences between volumes estimated with the high-resolution CT data set (typical of ex vivo skeletal scans) and the low-resolution CT data set (typical of in vivo skeletal scans) were also explored using both patient CT images and a PVC pipe phantom. While a statistically significant difference (p value <0.002) between the high-resolution and low-resolution data sets was observed with excised femoral heads obtained following total hip arthroplasty, the mean difference between high-resolution and low-resolution data sets was found to be only 1.24 and 2.18 cm{sup 3} for spongiosa and cortical bone, respectively. With respect to differences observed with the PVC pipe, the variation between the high-resolution and low-resolution mean percent errors was a high as {approx}20% for the outer region volume estimates and only as high as {approx}6% for the inner region volume estimates. The findings from this study suggest that manual segmentation is a reasonably accurate and reliable means for the in vivo estimation of spongiosa volume. This work also provides a foundation for future studies where spongiosa volumes are estimated by various raters in more comprehensive CT data sets.

Brindle, James M.; Alexandre Trindade, A.; Pichardo, Jose C.; Myers, Scott L.; Shah, Amish P.; Bolch, Wesley E. [Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, Florida 32611 (United States); Department of Statistics, University of Florida, Gainesville, Florida 32611 (United States); Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, Florida 32611 (United States); Department of Orthopaedics and Rehabilitation, University of Florida, Gainesville, Florida 32611 (United States); MD Anderson Cancer Center Orlando, Orlando, Florida 32806 (United States); Department of Nuclear and Radiological and Department of Biomedical Engineering, University of Florida, Gainesville, Florida 32611 (United States)

2006-10-15T23:59:59.000Z

158

Extraction of Plutonium into 30 Percent Tri-Butyl Phosphate from Nitric Acid Solution Containing Fluoride, Aluminum, and Boron  

SciTech Connect (OSTI)

This work consists of experimental batch extraction data for plutonium into 30 volume-percent tri-butyl phosphate at ambient temperature from such a solution matrix and a model of this data using complexation constants from the literature.

Kyser, E.A.

2000-01-06T23:59:59.000Z

159

Webinar: 2011-2012 Hydrogen Student Design Contest Winners: On-Campus Tri-Generation Fuel Cell Systems  

Broader source: Energy.gov [DOE]

Video recording of the Fuel Cell Technologies Office webinar, 2011-2012 Hydrogen Student Design Contest Winners: On-Campus Tri-Generation Fuel Cell Systems, originally presented on September 4, 2012.

160

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Board for Physics  

E-Print Network [OSTI]

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject? Try out the HTML to PDF API Phase transition and Critical Phenomenon Mustansir Barma barma Spring 2004

Udgaonkar, Jayant B.

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Board for Physics  

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pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject version Are you a developer? Try out the HTML to PDF API Astronomy and Astrophysics& D version Are you a developer? Try out the HTML to PDF API Courses Instructor(s) e-mail Quantum Mechanics II

Udgaonkar, Jayant B.

162

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Board for Physics  

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pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Are you a developer? Try out the HTML to PDF API Astronomy and Astrophysics& A. Ray akr Nuclear Physics& R a developer? Try out the HTML to PDF API Courses Instructor(s) e-mail Quantum Mechanics II@$* Deepak Dhar

Udgaonkar, Jayant B.

163

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Board for Physics  

E-Print Network [OSTI]

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Astronomy and Astrophysics& Devendra.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Electrodynamics I Numerical Methods

Udgaonkar, Jayant B.

164

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Board for Physics  

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pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject version Are you a developer? Try out the HTML to PDF API Topics in Theoretical Physics Kedar Damle a developer? Try out the HTML to PDF API Admission SBP-guidelines Events Courses Contact SBP-members SBP Home

Udgaonkar, Jayant B.

165

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Share Facebook Tw itter Share StumbleUpon Email  

E-Print Network [OSTI]

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Share a developer? Try out the HTML to PDF API MORE INFORMATION ARBORETUM PLANT SALE ARBORETUM PLANT SALE Where a developer? Try out the HTML to PDF API well drilling boom 1 month, 1 week ago "Normal" irrigation can make

Pasternack, Gregory B.

166

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Board for Physics  

E-Print Network [OSTI]

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Courses #12;pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API;pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Reading Courses

Udgaonkar, Jayant B.

167

DOE - Office of Legacy Management -- Dorr Corp - CT 14  

Office of Legacy Management (LM)

Site Operations: Conducted heat treatment tests of source material using depleted uranium in an enclosed calciner CT.14-2 Site Disposition: Eliminated - No Authority - AEC...

168

Computed Tomography (CT) Scanning For Petrophysical Applications  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

R&D Fac R&D Fac ts Carbon Sequestration ContaCtS David Wildman Division Director Geosciences Division National Energy Technology Laboratory 626 Cochrans Mill Road P.O. Box 10940 Pittsburgh, PA 15236 412-386-4913 david.wildman@netl.doe.gov T. Robert McLendon Geosciences Division National Energy Technology Laboratory 3610 Collins Ferry Road P.O. Box 880 Morgantown, WV 26507 304-285-2008 t.mclen@netl.doe.gov Duane H. Smith Geosciences Division

169

CT-121_cover.p65  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

INNOVATIVE APPLICATIONS INNOVATIVE APPLICATIONS OF TECHNOLOGY FOR THE CT-121 FGD PROCESS PROJECT PERFORMANCE SUMMARY CLEAN COAL TECHNOLOGY DEMONSTRATION PROGRAM AUGUST 2002 SOUTHERN COMPANY SERVICES, INC. DOE/FE-0449 Disclaimer This report was prepared using publicly available information, including the Final Technical Report and other reports prepared pursuant to a cooperative agreement partially funded by the U.S. Department of Energy. Neither the United States Government nor any agency, employee, contractor, or representative thereof, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe upon privately

170

Frostbite Theater - Experiments You Can Try at Home! - Measure the Width of  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Measure the Speed of Light - With Chocolate! Measure the Speed of Light - With Chocolate! Previous Video (Measure the Speed of Light - With Chocolate!) Frostbite Theater Main Index Next Video (Light is a Particle!) Light is a Particle! Measure the Width of a Hair - With a Laser! Exactly how small is a hair's breadth? Measure it for yourself with nothing more than a laser pointer and a tape measure! [ Show Transcript ] Announcer: Frostbite Theater presents... Cold Cuts! No baloney! Joanna and Steve: Just science! Joanna: Hi! I'm Joanna! Steve: And I'm Steve! Joanna: If you have a laser pointer, and you know how to use it safely, try this. Take a hair, perhaps from a coworker, and tape it in a cardboard frame. Place it a few meters away from the wall and shine the laser through it, making sure that the laser hits the hair.

171

Initiation Temperature for Runaway Tri-n-Butyl Phosphate/Nitric Acid Reaction  

SciTech Connect (OSTI)

In a review of the safety basis for solvent extraction processes at the Department of Energy's Savannah River Site, a question was raised concerning the safety margin associated with a postulated accident involving a runaway tri-n-butyl phosphate (TBP)/nitric acid reaction due to the inadvertent heating of a tank. The safety margin was based on studies which showed the maximum temperature would not exceed 128 degrees Celsius compared to 130 degrees Celsius, the minimum initiation temperature for runaway reaction established in the 1950's following damaging incidents at the Savannah River and Hanford Sites. The reviewers were concerned the minimum temperature was not conservative since data for solutions containing 20 wt percent dissolved solids showed initiation temperatures at or below 130 degrees Celsius and process solutions normally contain some dissolved solids.

Rudisill, T.S.

2001-09-14T23:59:59.000Z

172

A thermodynamic model of nitric acid extraction by tri-n-butyl phosphate  

SciTech Connect (OSTI)

A thermodynamic model is presented for nitric acid extraction by tri-n-butyl phosphate (TBP). This model is based on the formation of the organic phase species: TBP.HNO/sub 3/ and (TBP)/sub 2/.HNO/sub 3/. The model works successfully at TBP concentrations of 5 to 100 vol% and was found to be effective at predicting the extraction of HNO/sub 3/ from HNO/sub 3//NaNO/sub 3/ and HNO/sub 3//LiNO/sub 3/ solutions. Within the TBP concentration range of 5 to 30%, a single set of extraction constants was sufficient to fit extraction data. Stoichiometric activity coefficients of nitric acid in HNO/sub 3//NaNO/sub 3/ and HNO/sub 3//LiNO/sub 3/ mixtures were calculated using a model developed by Bromley.

Chaiko, D.J.; Vandegrift, G.F.

1988-07-01T23:59:59.000Z

173

Tri-State Generation and Transmission Association's Springverville unit 3 earns POWER's highest honor  

SciTech Connect (OSTI)

It is said that pioneers take the arrows. In the case of Springerville Unit 3 - a 418 MW(net) expansion of a Tucson Electric Power facility in Arizona and the first pulverized coal-fired units built in the US in more than decade, the arrows were many. Although Tri-State (the developer), Tuscon Electric (the host), and Bechtel Power (the EPC contractor) were wounded by delayed deliveries of major equipment, bankruptcy of a major supplier, and a labor shortage, the companies showed their pioneering spirit and completed the project ahead of schedule. For ushering in a new generation of clean and desperately needed baseload capacity, Springerville Unit 3 is POWER magazine's 2006 Plant of the Year. 9 figs.

Peltier, R.

2006-09-15T23:59:59.000Z

174

Tri-County Elec Member Corp (North Carolina) | Open Energy Information  

Open Energy Info (EERE)

Carolina) Carolina) Jump to: navigation, search Name Tri-County Elec Member Corp Place North Carolina Utility Id 18957 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes ISO Other Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Demand from 51 kW to 1,000 kW or kWh greater than 15,000 Commercial Demand of 1000 kW or greater Industrial General Power Rate 50 kW & >15,000 Commercial Green Power Switch Residential Rate Schedule Residential Average Rates Residential: $0.0987/kWh Commercial: $0.0925/kWh Industrial: $0.0623/kWh

175

Tri-State G & T Assn, Inc | Open Energy Information  

Open Energy Info (EERE)

Assn, Inc Assn, Inc Jump to: navigation, search Name Tri-State G & T Assn, Inc Place Colorado Utility Id 30151 Utility Location Yes Ownership C NERC Location WECC NERC WECC Yes ISO Other Yes Operates Generating Plant Yes Activity Generation Yes Activity Transmission Yes Activity Buying Transmission Yes Activity Wholesale Marketing Yes Alt Fuel Vehicle Yes Alt Fuel Vehicle2 Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png No rate schedules available. Average Rates No Rates Available References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a"

176

Explosive Detection in Aviation Applications Using CT  

SciTech Connect (OSTI)

CT scanners are deployed world-wide to detect explosives in checked and carry-on baggage. Though very similar to single- and dual-energy multi-slice CT scanners used today in medical imaging, some recently developed explosives detection scanners employ multiple sources and detector arrays to eliminate mechanical rotation of a gantry, photon counting detectors for spectral imaging, and limited number of views to reduce cost. For each bag scanned, the resulting reconstructed images are first processed by automated threat recognition algorithms to screen for explosives and other threats. Human operators review the images only when these automated algorithms report the presence of possible threats. The US Department of Homeland Security (DHS) has requirements for future scanners that include dealing with a larger number of threats, higher probability of detection, lower false alarm rates and lower operating costs. One tactic that DHS is pursuing to achieve these requirements is to augment the capabilities of the established security vendors with third-party algorithm developers. A third-party in this context refers to academics and companies other than the established vendors. DHS is particularly interested in exploring the model that has been used very successfully by the medical imaging industry, in which university researchers develop algorithms that are eventually deployed in commercial medical imaging equipment. The purpose of this paper is to discuss opportunities for third-parties to develop advanced reconstruction and threat detection algorithms.

Martz, H E; Crawford, C R

2011-02-15T23:59:59.000Z

177

Trends of CT Utilization in North America Over the Last Decade  

Science Journals Connector (OSTI)

Given the improvements in technology and usefulness of CT for diagnosis and therapeutic-planning, the growth in CT utilization is not surprising. Current estimates are that more than 85 million CT scans are pe...

Lauren M. B. Burke; Richard C. Semelka; Rebecca Smith-Bindman

2014-11-01T23:59:59.000Z

178

Radiation Protection in Newer Medical Imaging Technologies: PET/CT  

Science Journals Connector (OSTI)

......58 timely. Safety Report Series...challenging topic of Radiation Exposure of...of various software packages is...and age. To Safety Report Series...CT dosimetry software site impactscan...its June 2006 software version fade...Management of Radiation Dose in CT...Section 5 of Safety Report Series......

Dawn Banghart

2009-07-01T23:59:59.000Z

179

CT Poison Control Center 2014 Video Contest Rules  

E-Print Network [OSTI]

entry form (found on posioncontrol.uchc.edu) b. Include a link to your video from your You Tube account and community partners. Judges will consider: length of video, appropriate format, accuracy of information poison center means to you, value of the CT Poison Control Center · Programming your phone with the CT

Kim, Duck O.

180

On recent claims concerning the Rh = ct Universe  

Science Journals Connector (OSTI)

......density rho. One-on-one comparative tests between R h-=-ct and lambdaCDM have...corollary (see also Weinberg 1972). To test whether in fact the EOS p-=-rho/3...carried out an extensive suite of comparative tests using lambdaCDM and R h-=-ct, together......

Fulvio Melia

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Measuring and segmentation in CT data using deformable Vclav Krajcek  

E-Print Network [OSTI]

tomography (CT). We take advantage of long-time research in the area of deformable models. We have developed Snakes, CT, Medical Segmentation, Volume Measurement. 1 INTRODUCTION Computed tomography is a common tool, that temperature of healthy body is about 36,5 C. Higher temperature means that body is fighting with an illness

Pelikan, Josef

182

MicroCT: Semi-Automated Analysis of CT Reconstructed Data of Home Made Explosive Materials Using the Matlab MicroCT Analysis GUI  

SciTech Connect (OSTI)

This Standard Operating Procedure (SOP) provides the specific procedural steps for analyzing reconstructed CT images obtained under the IDD Standard Operating Procedures for data acquisition [1] and MicroCT image reconstruction [2], per the IDD Quality Assurance Plan for MicroCT Scanning [3]. Although intended to apply primarily to MicroCT data acquired in the HEAFCAT Facility at LLNL, these procedures may also be applied to data acquired at Tyndall from the YXLON cabinet and at TSL from the HEXCAT system. This SOP also provides the procedural steps for preparing the tables and graphs to be used in the reporting of analytical results. This SOP applies to R and D work - for production applications, use [4].

Seetho, I M; Brown, W D; Kallman, J S; Martz, H E; White, W T

2011-09-22T23:59:59.000Z

183

MicroCT: Automated Analysis of CT Reconstructed Data of Home Made Explosive Materials Using the Matlab MicroCT Analysis GUI  

SciTech Connect (OSTI)

This Standard Operating Procedure (SOP) provides the specific procedural steps for analyzing reconstructed CT images obtained under the IDD Standard Operating Procedures for data acquisition [1] and MicroCT image reconstruction [2], per the IDD Quality Assurance Plan for MicroCT Scanning [3]. Although intended to apply primarily to MicroCT data acquired in the HEAFCAT Facility at LLNL, these procedures may also be applied to data acquired at Tyndall from the YXLON cabinet and at TSL from the HEXCAT system. This SOP also provides the procedural steps for preparing the tables and graphs to be used in the reporting of analytical results. This SOP applies to production work - for R and D there are two other semi-automated methods as given in [4, 5].

Seetho, I M; Brown, W D; Kallman, J S; Martz, H E; White, W T

2011-09-22T23:59:59.000Z

184

Synthesis, Structure, and Reactivity ofbis(1,2,4-tri-t-butylcyclopentadienyl) Complexes of Cerium  

SciTech Connect (OSTI)

The sterically demanding 1,2,4-tri-t-butylcyclopentadienylligand (1,2,4-(Me3C)3C5H2, hereafter Cp') has been used to preparemonomeric cerium metallocenes, Cp 2CeX (X = Cl, I, OSO2CF3), which areused to synthesize the benzyl, Cp'2CeCH2C6H5. The benzyl is a usefulstarting material for preparing other complexes in the Cp'2CeZ system (Z= BF4, F, NH2, C6H5, H). X-ray crystal structures of Cp'2CeOSO2CF3,Cp'2CeF, Cp'2CeCH2C6H5, and Cp'2CeH are presented. The benzyl slowlydecomposes in solution to toluene and a metallacycle,[Cp'][(Me3C)2C5H2(CMe2CH2)]Ce. The ring CMe3 groups of both themetallacycle and the hydride, Cp'2CeH, can be fully deuterated byprolonged exposure to C6D6, providing a useful labeling tool inmechanistic studies.The hydride activates C-F and/or C-H bonds influorobenzenes, C6HxF6-x , x = 0-5. The reactions are selective, with theselectivity depending on the presence of two fluorines ortho to thereaction site more than on the type of bond activated. Complexes of thetype Cp'2CeC6HxF5-x , x = 0-4, are formed as intermediates, which slowlydecompose in solution to Cp'2CeF and fluorobenzynes, C6HxF4-x, x = 0-4,which are trapped. The rate at which Cp'2CeC6HxF5-x complexes decomposeincreases as the number of fluorines decreases. Complexes with oneortho-fluorine decompose much faster than those with two ortho-fluorines.The metallacycle activates only C-H bonds in fluorobenzenes, permittingthe synthesis of specific Cp'2CeC6HxF5-x complexes. The crystal structureof Cp'2CeC6F5 is presented. The hydride and the metallacycle react withfluoromethanes, CH4-xFx, x = 1-3, through postulated Cp'2CeCH3-xFxintermediates to generate Cp'2CeF and other products. The other products,CH4, tri-t-butylbenzenes, tri-t-butylfluorobenzenes, and a presumedmetallocene cerium fluoride with one Cp' and one (Me2EtC)(Me3C)2C5H2ligand, suggest a decomposition pathway for Cp'2CeCH3-xFx , x = 1-3, thatinvolves carbenes or carbenoids, which are trapped. The hydridepolymerizes ethylene, but hydrogenates other olefins. The metallacycleactivates C-H bonds in olefins and aromatics to generate new complexeswith Ce-C bonds. The hydride reacts with one equivalent of CO in pentaneto generate (Cp'2Ce)2CH2O, whose crystal structure shows the presence ofa bridging dianionic formaldehyde ligand. (Cp'2Ce)2CH2O reacts H2 to givethe hydride and Cp'2CeOMe, or with a mixture of H2 and CO to generateCp'2CeOMe exclusively. (Cp'2Ce)2CH2O or the hydride can react with anadditional equivalent of CO to generate dimeric enediolate,(Cp'2CeCHO)2.

Werkema, Evan L.

2005-05-19T23:59:59.000Z

185

Pediatric CT scan usage in Japan: results of a hospital survey  

Science Journals Connector (OSTI)

CT radiation dose settings are adjusted for children based on guidelines issued by the Japan Radiological Society, with few limitations. CT...

Nader Ghotbi; Akira Ohtsuru; Yoji Ogawa; Mariko Morishita…

2006-10-01T23:59:59.000Z

186

E-Print Network 3.0 - angiographic cone-beam ct Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: medical multi-slicecone-beam CT scanners typically use equiangular projection data, our new formula may... : Computed tomography (CT), cone-beam geometry, Feldkamp-type...

187

Effect of temperature on the extraction of uranium(VI) from nitric acid by tri-n-amyl phosphate  

SciTech Connect (OSTI)

Studies have been carried out on the effect of temperature on the extraction of U(VI) from nitric acid medium by tri-n-amyl phosphate/n-dodecane, measured as a function of the extractant concentration and aqueous phase acidity. The results indicate that the extraction is exothermic as in the case of tri-n-butyl phosphate. From the data available an effort has been made to calculate the equilibrium constant, the Gibbs energy change and the entropy changes of the extraction reaction. 21 refs., 3 figs., 4 tabs.

Srinivasan, T.G.; Rao, P.R.V. [Indira Gandhi Centre for Atomic Research, Kalpakkam (India); Sood, D.D. [Indira Gandhi Centre for Atomic Research, Kalpakkam (India)]|[BARC, Mumbai (India)

1997-01-01T23:59:59.000Z

188

Microsoft Word - Ct121R1.doc  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Innovative Applications Innovative Applications of Technology for the CT-121 FGD Process A DOE Assessment DOE/NETL-2002/1177 September 2002 U.S. Department of Energy National Energy Technology Laboratory P.O. Box 880, 3610 Collins Ferry Road Morgantown, WV 26507-0880 P.O. Box 10940, 626 Cochrans Mill Road Pittsburgh, PA 15236-0940 West Third Street, Suite 1400 Tulsa, OK 74103-3519 website: www.netl.doe.gov 2 Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents

189

CT113-53 Cape Wind Report_  

Broader source: Energy.gov (indexed) [DOE]

M M Report of the Effect on Radar Performance of the Proposed Cape Wind Project and Advance Copy of USCG Findings and Mitigation U.S. Department of the Interior Minerals Management Service MMS Cape Wind Energy Project January 2009 Final EIS Appendix M Report of the Effect on Radar Performance of the Proposed Cape Wind Project and Advance Copy of USCG Findings and Mitigation Technology Service Corporation an employee-owned company 55 Corporate Drive 3rd Floor, Trumbull, Connecticut 06611 Phone: (203) 268-1249 Fax: (203) 452-0260 www.tsc.com Ref: TSC-CT113-53 Report of the Effect on Radar Performance of the Proposed Cape Wind Project Submitted to the United States Coast Guard December 16, 2008 USCG Order #HSCG24-08-F-16A248

190

CT Solar Loan | Open Energy Information  

Open Energy Info (EERE)

Solar Loan Solar Loan No revision has been approved for this page. It is currently under review by our subject matter experts. Jump to: navigation, search Summary Last modified on March 29, 2013. Financial Incentive Program Place Connecticut Name CT Solar Loan Incentive Type State Loan Program Applicable Sector Multi-Family Residential, Residential Eligible Technologies Photovoltaics Active Incentive Yes Implementing Sector State/Territory Energy Category Renewable Energy Incentive Programs Terms 15 years Program Administrator The Clean Energy Finance and Investment Authority Website http://www.energizect.com/residents/programs/ctsolarloan Last DSIRE Review 03/29/2013 References Database of State Incentives for Renewables and Efficiency[1] Summary The Clean Energy Finance and Investment Authority is offering a pilot loan

191

Frostbite Theater - Experiments You Can Try at Home! - Light is a Particle!  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Measure the Width of a Hair - With a Laser! Measure the Width of a Hair - With a Laser! Previous Video (Measure the Width of a Hair - With a Laser!) Frostbite Theater Main Index Next Video (Let's Measure the Diameter of the Sun!) Let's Measure the Diameter of the Sun! Light is a Particle! Do you have a laser? Do you have a roll of duct tape that's a really, really bright pink? If so, you can explore the exciting world of quantum physics by demonstrating the particle nature of light! [ Show Transcript ] Announcer: Frostbite Theater presents... Cold Cuts! No baloney! Joanna and Steve: Just science! Joanna: Hi! I'm Joanna! Steve: And I'm Steve! Joanna: If you have a laser, and you know how to use it safely, try this. Find something that's really bright pink and shine the laser on it. If you use a red laser, you'll get a red dot, just like you'd might expect.

192

Initiation Temperature for Runaway Tri-n-Butyl Phosphate/Nitric Acid Reaction  

SciTech Connect (OSTI)

During a review of the H-Canyon authorization basis, Defense Nuclear Facility Safety Board (DNFSB) staff members questioned the margin of safety associated with a postulated tri-n-butyl phosphate (TBP)/nitric acid runaway reaction due to the inadvertent heating of a canyon tank containing greater than 3000 lbs (1362 kg) of TBP. The margin of safety was partially based on experiments and calculations performed by the Actinide Technology Section (ATS) to support deletion of indication of tank agitation as a Safety Class System. In the technical basis for deletion of this system, ATS personnel conservatively calculated the equilibrium temperature distribution of a canyon tank containing TBP and nitric acid layers which were inadvertently heated by a steam jet left on following a transfer. The maximum calculated temperature (128 degrees C) was compared to the minimum initiation temperature for a runaway reaction (greater than 130 degrees C) documented by experimental work in the mid 195 0s. In this work, the initiation temperature as a function of nitric acid concentration was measured for 0 and 20 wt percent dissolved solids. The DNFSB staff members were concerned that data for 0 wt percent dissolved solids were not conservative given the facts that data for 20 wt percent dissolved solids show initiation temperatures at or below 130 degrees C and H-Canyon solutions normally contained a small amount of dissolved solids.

Rudisill, T.S.

2000-11-28T23:59:59.000Z

193

Thorium ions transport across Tri-n-butyl phosphate-benzene based supported liquid membranes  

SciTech Connect (OSTI)

Transport of Th(IV) ions across tri-n-butyl phosphate (TBP) benzene based liquid membranes supported in microporous hydrophobic polypropylene film (MHPF) has been studied. Various parameters such as variation of nitric acid concentration in the feed, TBP concentration in the membrane, and temperature on the given metal ions transport have been investigated. The effects of nitric acid and TBP concentrations on the distribution coefficient were also studied, and the data obtained were used to determine the Th ions-TBP complex diffusion coefficient in the membrane. Permeability coefficients of Th(IV) ions were also determined as a function of the TBP and nitric acid concentrations. The optimal conditions for the transport of Th(IV) ions across the membrane are 6 mol{sm_bullet}dm{sup -3} HNO{sub 3} concentration, 2.188 mol {center_dot} dm{sup -3} TBP concentration, and 25{degrees}C. The stoichiometry of the chemical species involved in chemical reaction during the transport of Th(IV) ions has also been studied.

Rasul, G.; Chaudry, M.A. [Pakistan Institute of Nuclear Chemistry, Islamabad (Pakistan); Afzal, M. [Quaid-I-Azam Univ., Islamabad (Pakistan)

1995-12-01T23:59:59.000Z

194

Fouling effects of tri-n-butylphosphate on reverse osmosis performance and techniques for performance recovery  

SciTech Connect (OSTI)

The F/H Effluent Treatment Facility (F/H ETF) must be on-line by November 1988 to treat the low level activity wastes presently being discharged to the F- and H- areas' seepage basins. The three main processes of the F/H ETF are filtration, reverse osmosis, and ion exchange. Any dissolved organics present in the F/H ETF's feed have the potential to affect operation of the reverse osmosis system. Earlier studies with F/H ETF feed simulant and 70 volume percent kerosene and 30 volume percent tri-n-butylphosphate (TBP) additions showed that the kerosene/TBP mixture results in partial fouling of reverse osmosis membranes. A more detailed analysis of the seepage basin feed has shown that TBP is the major dissolved organic compound. Since it is dissolved (soluble to about 400 ppM at 25{degree}C), TBP will be present in the reverse osmosis feed unless removed by a means other than filtration. Thus the fouling effect of TBP (without kerosene) on reverse osmosis performance was investigated. 4 refs., 8 figs., 2 tabs.

Poy, F.L.

1987-07-28T23:59:59.000Z

195

The sequence and characterization of TRI1, a cytochrome P450 monooxygenase involved in T-2 toxin biosynthesis  

E-Print Network [OSTI]

the genomic and cDNA sequence revealed four introns and a potential 1626 bp ORF that could encode a 542 amino acid protein with homology to a cytochrome P450 monooxygenase. Disruption of TRI1 in F. sporotrichioides NRRL 3299 resulted in an accumulation of 4...

Meek, Isaac Burton

2012-06-07T23:59:59.000Z

196

Single-scattering properties of tri-axial ellipsoidal mineral dust aerosols: A database for application to radiative transfer calculations  

E-Print Network [OSTI]

Single-scattering properties of tri-axial ellipsoidal mineral dust aerosols: A database Applications and Research, Camp Spring, MD 20746, USA a r t i c l e i n f o Article history: Received 14 Optical properties Database a b s t r a c t This paper presents a user-friendly database software package

Liou, K. N.

197

SLIM AND TRIM WITH SUCCULENT SEAFOOD SO,you've been trying to "diet in quiet" as  

E-Print Network [OSTI]

50 SLIM AND TRIM WITH SUCCULENT SEAFOOD SO,you've been trying to "diet in quiet" as Odgen Nash products can slim and trim you while you enjoy every luscious bite. The rea- son is that seafood are high planned for dieters, not those loaded with but- ter or sauces. Give ve r sat i I e seafoods a chance

198

Tris(bis(trimethylsilyl)amido)uranium: Compounds with tri-, tetra-, and penta-valent uranium  

SciTech Connect (OSTI)

This trivalent uranium compound, serves as a precursor to new tri-, tetra-, and penta-valent uranium species. The geometry about the U atom is pyramidal. Lewis-base coordination compounds of U(N(SiMe/sub 3/)/sub 2/)/sub 3/ with a one-to-one- ratio of Lewis base to uranium were isolated with pyridine, 4-dimethylamino-pyridine, 2,6-Me/sub 2/-C/sub 6/H/sub 3/NC, and TPO. Two-to-one coordination compounds were obtained with t-butylnitrile and t-butylisocyanide. Compounds with more sterically demanding bases could not be isolated. The expected decrease in U-N(SiMe/sub 3/)/sub 2/ bond length with increase in oxidation state is not observed. Reaction of ClU(N(SiMe/sub 3/)/sub 2/)/sub 3/and Li(NH(p-tolyl)) yields the uranium (IV) dimer, U/sub 2/(N(SiMe/sub 3/)/sub 2/)/sub 4/(..mu..-N(p-tolyl))/sub 2/. Reaction with 2,4,6-triemethylaniline produces a dimer. Analogous substitution products could not be obtained with aniline or p-toluidine. t-Bu/sub 3/CO/sup /minus//, t-Bu/sub 2/CHO/sup /minus//, and t-Bu/sub 3/SiO/sup /minus// are used to synthesize new tetravalent, mononuclear uranium compounds. Reaction of ClU(tritox)/sub 3/ with alkyllithium reagents leads to isolation of RU(tritox)/sub 3/. The reaction of U(ditox)/sub 4/ with MeLi affords the addition product U(ditox)/sub 4/(Me)Li, whose crystal structure is described. Preparation of uranium silox compounds is reported. 97 refs., 26 figs., 39 tabs.

Stewart, J.L.

1988-04-01T23:59:59.000Z

199

Multi-atlas segmentation in head and neck CT scans  

E-Print Network [OSTI]

We investigate automating the task of segmenting structures in head and neck CT scans, to minimize time spent on manual contouring of structures of interest. We focus on the brainstem and left and right parotids. To generate ...

Arbisser, Amelia M

2012-01-01T23:59:59.000Z

200

Obscure pulmonary masses: bronchial impaction revealed by CT  

SciTech Connect (OSTI)

Dilated bronchi impacted with mucus or tumor are recognized on standard chest radiographs because they are surrounded by aerated pulmonary parenchyma. When imaged in different projections, these lesions produce a variety of appearances that are generally familiar. This report characterizes less familiar computed tomographic (CT) findings in eight patients with pathologic bronchial distension of congenital, neoplastic, or infectious etiologies and correlates them with chest films. In seven patients, CT readily revealed dilated bronchi and/or regional lung hypodensity. In four of these cases, CT led to the initial suspicion of dilated bronchi. CT should be used early in the evaluation of atypical pulmonary mass lesions or to confirm suspected bronchial impaction because of the high probability it will reveal diagnostic features.

Pugatch, R.D.; Gale, M.E.

1983-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

DOE - Office of Legacy Management -- Olin Mathieson - CT 0-02  

Office of Legacy Management (LM)

Olin Mathieson - CT 0-02 Olin Mathieson - CT 0-02 FUSRAP Considered Sites Site: OLIN MATHIESON (CT.0-02 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: United Nuclear Corporation CT.0-02-1 Location: New Haven , Connecticut CT.0-02-1 Evaluation Year: 1987 CT.0-02-1 Site Operations: Began fabrication of nuclear reactor fuel elements for AEC circa late-1950s. Later became part of a group forming United Nuclear Corp. and were then licensed by AEC. Performed work for U.S. Navy and commercial applications. CT.0-02-1 Site Disposition: Eliminated - No Authority - AEC licensed CT.0-02-1 Radioactive Materials Handled: Yes CT.0-02-1 Primary Radioactive Materials Handled: Uranium CT.0-02-1 Radiological Survey(s): None Indicated

202

X-ray MicroCT Training Presentation  

E-Print Network [OSTI]

X-ray MicroCT Training Presentation T. Fettah Kosar, PhD Center for Nanoscale Systems Harvard) Model: HMXST225 (max. 225 kV) #12;Overview 3 Introduction to X-ray imaging and Computed Tomography (CT) · What are X-rays and how do we generate and image them? · How do we magnify X-ray images and keep them

203

A Compact Torus Fusion Reactor Utilizing a Continuously Generated String of CT’s. The CT String Reactor, CTSR  

Science Journals Connector (OSTI)

A fusion reactor is described in which a moving string ... conducting cylinder where the plasma is heated to fusion-producing temperature. The CT then passes into a blanketed region where fusion energy is produce...

Charles W. Hartman; David B. Reisman; Harry S. McLean…

2008-06-01T23:59:59.000Z

204

Radiation Dose Metrics in CT: Assessing Dose Using the National Quality Forum CT Patient Safety Measure  

Science Journals Connector (OSTI)

Purpose The National Quality Forum (NQF) is a nonprofit consensus organization that recently endorsed a measure focused on CT radiation doses. To comply, facilities must summarize the doses from consecutive scans within age and anatomic area strata and report the data in the medical record. Our purpose was to assess the time needed to assemble the data and to demonstrate how review of such data permits a facility to understand doses. Methods and Materials To assemble the data we used for analysis, we used the dose monitoring software eXposure to automatically export dose metrics from consecutive scans in 2010 and 2012. For a subset of 50 exams, we also collected dose metrics manually, copying data directly from the PACS into an excel spreadsheet. Results Manual data collection for 50 scans required 2 hours and 15 minutes. eXposure compiled the data in under an hour. All dose metrics demonstrated a 30% to 50% reduction between 2010 and 2012. There was also a significant decline and a reduction in the variability of the doses over time. Conclusion The NQF measure facilitates an institution's capacity to assess the doses they are using for CT as part of routine practice. The necessary data can be collected within a reasonable amount of time either with automatic software or manually. The collection and review of these data will allow facilities to compare their radiation dose distributions with national distributions and allow assessment of temporal trends in the doses they are using.

Jillian Keegan; Diana L. Miglioretti; Robert Gould; Lane F. Donnelly; Nicole D. Wilson; Rebecca Smith-Bindman

2014-01-01T23:59:59.000Z

205

Design and synthesis of a novel, orally active, brain penetrant, tri-substituted thiophene based JNK inhibitor  

SciTech Connect (OSTI)

The SAR of a series of tri-substituted thiophene JNK3 inhibitors is described. By optimizing both the N-aryl acetamide region of the inhibitor and the 4-position of the thiophene we obtained single digit nanomolar compounds, such as 47, which demonstrated an in vivo effect on JNK activity when dosed orally in our kainic acid mouse model as measured by phospho-c-jun reduction.

Bowers, Simeon; Truong, Anh P.; Neitz, R. Jeffrey; Neitzel, Martin; Probst, Gary D.; Hom, Roy K.; Peterson, Brian; Galemmo, Jr., Robert A.; Konradi, Andrei W.; Sham, Hing L.; Tóth, Gergley; Pan, Hu; Yao, Nanhua; Artis, Dean R.; Brigham, Elizabeth F.; Quinn, Kevin P.; Sauer, John-Michael; Powell, Kyle; Ruslim, Lany; Ren, Zhao; Bard, Frédérique; Yednock, Ted A.; Griswold-Prenner, Irene (Elan)

2012-02-28T23:59:59.000Z

206

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Board for Physics  

E-Print Network [OSTI]

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Aspects of Field Theory S. Trivedi

Udgaonkar, Jayant B.

207

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject Board for Physics  

E-Print Network [OSTI]

pdfcrowd.comopen in browser PRO version Are you a developer? Try out the HTML to PDF API Subject the HTML to PDF API Astronomy and Astrophysics& D. Narasimha/D. Ojha dna/ojha Nuclear Physics& Indranil a developer? Try out the HTML to PDF API Courses Instructor(s) e-mail Quantum Mechanics II@$* Sunil Mukhi

Udgaonkar, Jayant B.

208

Tri-State Synfuels Project Review: Volume 12. Fluor project status. [Proposed Henderson, Kentucky coal to gasoline plant; engineering  

SciTech Connect (OSTI)

The purpose of this report is to document and summarize activities associated with Fluor's efforts on the Tri-State Synfuels Project. The proposed facility was to be coal-to-transport fuels facility located in Henderson, Kentucky. Tri-State Synfuels Company was participating in the project as a partner of the US Department of Energy per terms of a Cooperative Agreement resulting from DOE's synfuel's program solicitation. Fluor's initial work plan called for preliminary engineering and procurement services to the point of commitment for construction for a Sasol Fischer-Tropsch plant. Work proceeded as planned until October 1981 when results of alternative coal-to-methanol studies revealed the economic disadvantage of the Synthol design for US markets. A number of alternative process studies followed to determine the best process configuration. In January 1982 Tri-State officially announced a change from Synthol to a Methanol to Gasoline (MTG) design basis. Further evaluation and cost estimates for the MTG facility eventually led to the conclusion that, given the depressed economic outlook for alternative fuels development, the project should be terminated. Official announcement of cancellation was made on April 13, 1982. At the time of project cancellation, Fluor had completed significant portions of the preliminary engineering effort. Included in this report are descriptions and summaries of Fluor's work during this project. In addition location of key project data and materials is identified and status reports for each operation are presented.

Not Available

1982-06-01T23:59:59.000Z

209

Low-Dose Spiral CT Scans for Early Lung Cancer Detection | Department of  

Broader source: Energy.gov (indexed) [DOE]

Low-Dose Spiral CT Scans for Early Lung Cancer Detection Low-Dose Spiral CT Scans for Early Lung Cancer Detection Low-Dose Spiral CT Scans for Early Lung Cancer Detection Low-dose spiral computed tomography (CT) scanning is a noninvasive medical imaging test that has been used for the early detection of lung cancer for over 16 years (Sone et al. 1998; Henschke et.al. 1999). A low-dose spiral chest CT differs from a full-dose conventional chest CT scan primarily in the amount of radiation emitted during CT scans. Chest CT, in general, requires less radiation exposure than other CT procedures because the air-filled tissues of the lungs are not as dense as the tissues of other organs (i.e., less x-ray radiation is needed to penetrate the lung). Radiation dose can be further reduced with lung cancer screening due to the

210

Characteristics of modified CT injector for JFT-2M  

Science Journals Connector (OSTI)

The HIT-CTI mark II compact toroid (CT) injector employed for the JFT-2M tokamak facility at the Japan Atomic Energy Research Institute (JAERI) has been upgraded to improve injection performance. The nozzle of the mark III injector now has a linear tube in place of the original focus cone to avoid rapid focus and deceleration, and the tapered outer electrode has been replaced with more gentle taper in the compression section in order to facilitate gradual compression. The dependence of CT velocity and electron density on poloidal bias flux and trigger time of CT acceleration have been investigated in the operable range of 70–230 km/s average CT velocity and electron density of 0.1–1.0 × 1022 m?3 at an accelerator bank voltage of 25 kV. The operation window is broader than that of the mark II injector. Emission of a CT plasmoid from the injector, and transport to the flux conserver as a high-density spheromak magnetic structure have also been confirmed.

N. Fukumoto; H. Ogawa; M. Nagata; T. Uyama; T. Shibata; Y. Kashiwa; Y. Kusama

2004-01-01T23:59:59.000Z

211

A Compact Torus Fusion Reactor Utilizing a Continuously Generated Strings of CT's. The CT String Reactor, CTSR.  

SciTech Connect (OSTI)

A fusion reactor is described in which a moving string of mutually repelling compact toruses (alternating helicity, unidirectional Btheta) is generated by repetitive injection using a magnetized coaxial gun driven by continuous gun current with alternating poloidal field. An injected CT relaxes to a minimum magnetic energy equilibrium, moves into a compression cone, and enters a conducting cylinder where the plasma is heated to fusion-producing temperature. The CT then passes into a blanketed region where fusion energy is produced and, on emergence from the fusion region, the CT undergoes controlled expansion in an exit cone where an alternating poloidal field opens the flux surfaces to directly recover the CT magnetic energy as current which is returned to the formation gun. The CT String Reactor (CTSTR) reactor satisfies all the necessary MHD stability requirements and is based on extrapolation of experimentally achieved formation, stability, and plasma confinement. It is supported by extensive 2D, MHD calculations. CTSTR employs minimal external fields supplied by normal conductors, and can produce high fusion power density with uniform wall loading. The geometric simplicity of CTSTR acts to minimize initial and maintenance costs, including periodic replacement of the reactor first wall.

Hartman, C W; Reisman, D B; McLean, H S; Thomas, J

2007-05-30T23:59:59.000Z

212

Introduction New currents in DIS  

E-Print Network [OSTI]

for precision measurement of the scattered lepton ZEUS Depleted Uranium Calorimeter Optimised for precision

213

PET/CT-guided Interventions: Personnel Radiation Dose  

SciTech Connect (OSTI)

PurposeTo quantify radiation exposure to the primary operator and staff during PET/CT-guided interventional procedures.MethodsIn this prospective study, 12 patients underwent PET/CT-guided interventions over a 6 month period. Radiation exposure was measured for the primary operator, the radiology technologist, and the nurse anesthetist by means of optically stimulated luminescence dosimeters. Radiation exposure was correlated with the procedure time and the use of in-room image guidance (CT fluoroscopy or ultrasound).ResultsThe median effective dose was 0.02 (range 0-0.13) mSv for the primary operator, 0.01 (range 0-0.05) mSv for the nurse anesthetist, and 0.02 (range 0-0.05) mSv for the radiology technologist. The median extremity dose equivalent for the operator was 0.05 (range 0-0.62) mSv. Radiation exposure correlated with procedure duration and with the use of in-room image guidance. The median operator effective dose for the procedure was 0.015 mSv when conventional biopsy mode CT was used, compared to 0.06 mSv for in-room image guidance, although this did not achieve statistical significance as a result of the small sample size (p = 0.06).ConclusionThe operator dose from PET/CT-guided procedures is not significantly different than typical doses from fluoroscopically guided procedures. The major determinant of radiation exposure to the operator from PET/CT-guided interventional procedures is time spent in close proximity to the patient.

Ryan, E. Ronan, E-mail: ronan@ronanryan.com; Thornton, Raymond; Sofocleous, Constantinos T.; Erinjeri, Joseph P. [Memorial Sloan-Kettering Cancer Center, Department of Radiology (United States); Hsu, Meier [Memorial Sloan-Kettering Cancer Center, Department of Epidemiology and Biostatistics (United States); Quinn, Brian; Dauer, Lawrence T. [Memorial Sloan-Kettering Cancer Center, Department of Medical Physics (United States); Solomon, Stephen B. [Memorial Sloan-Kettering Cancer Center, Department of Radiology (United States)

2013-08-01T23:59:59.000Z

214

On Recent Claims Concerning the R_h=ct Universe  

E-Print Network [OSTI]

The R_h=ct Universe is a Friedmann-Robertson-Walker (FRW) cosmology which, like LCDM, assumes the presence of dark energy in addition to (baryonic and non-luminous) matter and radiation. Unlike LCDM, however, it is also constrained by the equation of state (EOS) p=-rho/3, in terms of the total pressure p and energy density rho. One-on-one comparative tests between R_h=ct and LCDM have been carried out using over 14 different cosmological measurements and observations. In every case, the data have favoured R_h=ct over the standard model, with model selection tools yielding a likelihood ~90-95% that the former is correct, versus only ~5-10% for the latter. In other words, the standard model without the EOS p=-rho/3 does not appear to be the optimal description of nature. Yet in spite of these successes---or perhaps because of them---several concerns have been published recently regarding the fundamental basis of the theory itself. The latest paper on this subject even claims---quite remarkably---that R_h=ct is a vacuum solution, though quite evidently rho is not 0. Here, we address these concerns and demonstrate that all criticisms leveled thus far against R_h=ct, including the supposed vacuum condition, are unwarranted. They all appear to be based on incorrect assumptions or basic theoretical errors. Nevertheless, continued scrutiny such as this will be critical to establishing R_h=ct as the correct description of nature.

Fulvio Melia

2014-10-17T23:59:59.000Z

215

Tri-material multilayer coatings with high reflectivity and wide bandwidth for 25 to 50 nm extreme ultraviolet light  

SciTech Connect (OSTI)

Magnesium/silicon carbide (Mg/SiC) multilayers have been fabricated with normal incidence reflectivity in the vicinity of 40% to 50% for wavelengths in the 25 to 50 nm wavelength range. However many applications, for example solar telescopes and ultrafast studies using high harmonic generation sources, desire larger bandwidths than provided by high reflectivity Mg/SiC multilayers. We investigate introducing a third material, Scandium, to create a tri-material Mg/Sc/SiC multilayer allowing an increase the bandwidth while maintaining high reflectivity.

Aquila, Andrew; Salmassi, Farhad; Liu, Yanwei; Gullikson, Eric M.

2009-09-09T23:59:59.000Z

216

Evaluation of the robustness of the preprocessing technique improving reversible compressibility of CT images: Tested on various CT examinations  

SciTech Connect (OSTI)

Purpose: To modify the preprocessing technique, which was previously proposed, improving compressibility of computed tomography (CT) images to cover the diversity of three dimensional configurations of different body parts and to evaluate the robustness of the technique in terms of segmentation correctness and increase in reversible compression ratio (CR) for various CT examinations.Methods: This study had institutional review board approval with waiver of informed patient consent. A preprocessing technique was previously proposed to improve the compressibility of CT images by replacing pixel values outside the body region with a constant value resulting in maximizing data redundancy. Since the technique was developed aiming at only chest CT images, the authors modified the segmentation method to cover the diversity of three dimensional configurations of different body parts. The modified version was evaluated as follows. In randomly selected 368 CT examinations (352 787 images), each image was preprocessed by using the modified preprocessing technique. Radiologists visually confirmed whether the segmented region covers the body region or not. The images with and without the preprocessing were reversibly compressed using Joint Photographic Experts Group (JPEG), JPEG2000 two-dimensional (2D), and JPEG2000 three-dimensional (3D) compressions. The percentage increase in CR per examination (CR{sub I}) was measured.Results: The rate of correct segmentation was 100.0% (95% CI: 99.9%, 100.0%) for all the examinations. The median of CR{sub I} were 26.1% (95% CI: 24.9%, 27.1%), 40.2% (38.5%, 41.1%), and 34.5% (32.7%, 36.2%) in JPEG, JPEG2000 2D, and JPEG2000 3D, respectively.Conclusions: In various CT examinations, the modified preprocessing technique can increase in the CR by 25% or more without concerning about degradation of diagnostic information.

Jeon, Chang Ho; Kim, Bohyoung; Gu, Bon Seung; Lee, Jong Min [Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707 (Korea, Republic of)] [Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707 (Korea, Republic of); Kim, Kil Joong [Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707, South Korea and Department of Radiation Applied Life Science, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul 110-799 (Korea, Republic of)] [Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707, South Korea and Department of Radiation Applied Life Science, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul 110-799 (Korea, Republic of); Lee, Kyoung Ho [Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707, South Korea and Institute of Radiation Medicine, Seoul National University Medical Research Center, and Clinical Research Institute, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 110-744 (Korea, Republic of)] [Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707, South Korea and Institute of Radiation Medicine, Seoul National University Medical Research Center, and Clinical Research Institute, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 110-744 (Korea, Republic of); Kim, Tae Ki [Medical Information Center, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707 (Korea, Republic of)] [Medical Information Center, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707 (Korea, Republic of)

2013-10-15T23:59:59.000Z

217

DOE - Office of Legacy Management -- Metals Selling Corp - CT 0-01  

Office of Legacy Management (LM)

Selling Corp - CT 0-01 Selling Corp - CT 0-01 FUSRAP Considered Sites Site: METALS SELLING CORP. (CT.0-01 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: Putnam , Connecticut CT.0-01-1 Evaluation Year: 1986 CT.0-01-1 Site Operations: Performed grinding of (non-radioactive) magnesium circa 1950 -1952 as a sub-contractor to Mallinckrodt Corp. CT.0-01-1 Site Disposition: Eliminated - No indication that radioactive materials were handled at this location CT.0-01-1 Radioactive Materials Handled: No Primary Radioactive Materials Handled: None Radiological Survey(s): No Site Status: Eliminated from consideration under FUSRAP Also see Documents Related to METALS SELLING CORP. CT.0-01-1 - DOE Memorandum/Checklist D. Levine to File; Subject -

218

DOE - Office of Legacy Management -- Yale Heavy Ion Linear Accelerator - CT  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Yale Heavy Ion Linear Accelerator - Yale Heavy Ion Linear Accelerator - CT 05 FUSRAP Considered Sites Site: Yale Heavy Ion Linear Accelerator (CT.05) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: New Haven , Connecticut CT.05-1 Evaluation Year: 1987 CT.05-3 Site Operations: Research and development with solvents. CT.05-1 Site Disposition: Eliminated - Potential for contamination remote based on limited amount of materials handled CT.05-3 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium, Radium CT.05-1 Radiological Survey(s): No Site Status: Eliminated from consideration under FUSRAP Also see Documents Related to Yale Heavy Ion Linear Accelerator CT.05-1 - MED Memorandum; To the Files, Thru Ruhoff, et. al.;

219

Patient-size-dependent radiation dose optimisation technique for abdominal CT examinations  

Science Journals Connector (OSTI)

......CT dosimetry and radiation safety. Radiol. Soc...Notification. Reducing radiation risk from computed...gov/cdrh/safety/110201-ct...McCollough C. H. Radiation dose in computed...region of interest software available in both......

J. E. Ngaile; P. Msaki; R. Kazema

2012-01-01T23:59:59.000Z

220

E-Print Network 3.0 - abnormal brain ct Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Powered by Explorit Topic List Advanced Search Sample search results for: abnormal brain ct Page: << < 1 2 3 4 5 > >> 1 Hemorrhage Slices Detection in Brain CT Images Ruizhe...

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

VACT: Visualization-Aware CT Reconstruction Ziyi Zheng and Klaus Mueller, Senior Member, IEEE  

E-Print Network [OSTI]

Abstract-- Computed tomography (CT) reconstruction methods are often unaware of the requirements Medical routine frequently utilizes 3D visualization tools for diagnosis. Computed tomography (CT between the raw projection data and their visualization via vol- ume rendering. Our framework can

Mueller, Klaus

222

Detektion von Phäochromozytomen und rekurrenten medullären Schilddrüsenkarzinomen mit F18 DOPA PET/CT.  

E-Print Network [OSTI]

??Evaluating [18F]dihydroxyphenylalanine (DOPA) in patients with clinical suspicion for a primary or recurrent pheochromocytoma (pheo) by means of whole body PET/CT. In pheos PET/CT detects… (more)

Zeich, Katrin

2009-01-01T23:59:59.000Z

223

march/april 2013, Vol. 89, No. 2 --The ForesTry chroNicle 205 TRANSFOR-M: A unique transatlantic forestry Master program  

E-Print Network [OSTI]

march/april 2013, Vol. 89, No. 2 -- The ForesTry chroNicle 205 TRANSFOR-M: A unique transatlantic Sciences, Umeå, Sweden; and Bangor University, Wales) universities have developed a new transatlantic

Hamann, Andreas

224

EA-1915: Conveyance of Approximately 1,641 Acres of Unimproved Land to the Tri-City Development Council, the Local Community Reuse Organization, Richland, WA  

Broader source: Energy.gov [DOE]

This EA will evaluate the environmental impacts of conveyance of approximately 1,641 acres of unimproved land at DOE’s Hanford Site, Richland, Washington to the Tri-City Development Council (TRIDEC), the local community reuse organization (CRO).

225

Assessment of paediatric CT exposure in a Portuguese hospital  

Science Journals Connector (OSTI)

......paediatric CT exposure in a Portuguese hospital A. Neves 1 * A. Nunes 1 M. Rufino...2 Centro Hospitalar Lisboa Central, Hospital de S. Jose, Rua Jose Antonio Serrano...procedures was performed for a Portuguese hospital. Dosimetric data and technical parameters......

A. Neves; A. Nunes; M. Rufino; P. Madeira; P. Vaz; A. Pascoal

2012-09-01T23:59:59.000Z

226

Status and Promise CT's and Magnetized Target Fusion  

E-Print Network [OSTI]

. Hill (LLNL) #12;CT's: Spheromaks & Field Reversed Configurations At LLNL, the SSPX experiment is investigating spheromak formation, sustainment, and confinement issues. (Hill, Mclean, Wood, Ryutov). At UC-Davis, formation and acceleration of spheromaks. (Hwang) At the U of Washington, field reversed configuration

227

A geometric calibration method for cone beam CT systems  

SciTech Connect (OSTI)

Cone beam CT systems are being deployed in large numbers for small animal imaging, dental imaging, and other specialty applications. A new high-precision method for cone beam CT system calibration is presented in this paper. It uses multiple projection images acquired from rotating point-like objects (metal ball bearings) and the angle information generated from the rotating gantry system is also used. It is assumed that the whole system has a mechanically stable rotation center and that the detector does not have severe out-of-plane rotation (<2 deg.). Simple geometrical relationships between the orbital paths of individual BBs and five system parameters were derived. Computer simulations were employed to validate the accuracy of this method in the presence of noise. Equal or higher accuracy was achieved compared with previous methods. This method was implemented for the geometrical calibration of both a micro CT scanner and a breast CT scanner. The reconstructed tomographic images demonstrated that the proposed method is robust and easy to implement with high precision.

Yang, Kai; Kwan, Alexander L. C.; Miller, DeWitt F.; Boone, John M. [Department of Radiology, University of California, Davis Medical Center, 4701 X Street, Sacramento, California 95817 and Department of Biomedical Engineering, University of California, Davis, California 95616 (United States); Department of Radiology, University of California, Davis Medical Center, 4701 X Street, Sacramento, California 95817 (United States); Department of Radiology, University of California, Davis Medical Center, 4701 X Street, Sacramento, California 95817 and Department of Biomedical Engineering, University of California, Davis, California 95616 (United States)

2006-06-15T23:59:59.000Z

228

On Recent Claims Concerning the R_h=ct Universe  

E-Print Network [OSTI]

The R_h=ct Universe is a Friedmann-Robertson-Walker (FRW) cosmology which, like LCDM, assumes the presence of dark energy in addition to (baryonic and non-luminous) matter and radiation. Unlike LCDM, however, it is also constrained by the equation of state (EOS) p=-rho/3, in terms of the total pressure p and energy density rho. One-on-one comparative tests between R_h=ct and LCDM have been carried out using over 14 different cosmological measurements and observations. In every case, the data have favoured R_h=ct over the standard model, with model selection tools yielding a likelihood ~90-95% that the former is correct, versus only ~5-10% for the latter. In other words, the standard model without the EOS p=-rho/3 does not appear to be the optimal description of nature. Yet in spite of these successes---or perhaps because of them---several concerns have been published recently regarding the fundamental basis of the theory itself. The latest paper on this subject even claims---quite remarkably---that R_h=ct is ...

Melia, Fulvio

2014-01-01T23:59:59.000Z

229

AUTOCORRECTING RECONSTRUCTION FOR FLEXIBLE CT SCANNERS Jeff Orchard  

E-Print Network [OSTI]

revolutionize the world of computed tomography (CT). Tiny x-ray emitters and detectors could be embedded scanners. Index Terms: computed tomography, image reconstruction, entropy, nanotechnology, autofocus 1. An automatic (data-driven) motion-correction method for SPECT (single photon emission computed tomog- raphy

Orchard, Jeffery J.

230

Studies of magnetite nanoparticles synthesized by thermal decomposition of iron (III) acetylacetonate in tri(ethylene glycol)  

Science Journals Connector (OSTI)

In this paper, water-soluble magnetite nanoparticles have been directly synthesized by thermal decomposition of iron (III) acetylacetonate, Fe(acac)3 in tri(ethyleneglycol). Size and morphology of the nanoparticles are determined by transmission electron microscopy (TEM) and dynamic light scattering (DLS) measurements while the crystal structure is identified using X-ray diffraction (XRD). Surface charge and surface coating of the nanoparticles are recognized using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectra (XPS) and zeta potential measurements. Magnetic properties are determined using vibrating sample magnetometer (VSM) and superconducting quantum interference device (SQUID) measurements. The results show that as-prepared magnetite nanoparticles are relatively monodisperse, single crystalline and superparamagnetic in nature with the blocking temperature at around 100 K. The magnetite nanoparticles are found to be highly soluble in water due to steric and electrostatic interactions between the particles arising by the surface adsorbed tri(ethyleneglycol) molecules and associated positive charges, respectively. Cytotoxicity studies on human cervical (SiHa), mouse melanoma (B16F10) and mouse primary fibroblast cells demonstrate that up to a dose of 80 ?g/ml, the magnetic nanoparticles are nontoxic to the cells. Specific absorption rate (SAR) value has been calculated to be 885 and 539 W/gm for samples with the iron concentration of 1 and 0.5 mg/ml, respectively. The high SAR value upon exposure to 20 MHz radiofrequency signifies the applicability of as-prepared magnetite nanoparticles for a feasible magnetic hyperthermia treatment.

Dipak Maity; S.N. Kale; Ruchika Kaul-Ghanekar; Jun-Min Xue; Jun Ding

2009-01-01T23:59:59.000Z

231

Saturday Workshop 2/7/2009 RS: Molly Burke CT's: Roy Center & Lee Kelly  

E-Print Network [OSTI]

Saturday Workshop 2/7/2009 RS: Molly Burke CT's: Roy Center & Lee Kelly Drosophila Handbook page 1 2/7/2009 RS: Molly Burke CT's: Roy Center & Lee Kelly Drosophila Handbook page 2 Table of Contents Standards 22 #12;Saturday Workshop 2/7/2009 RS: Molly Burke CT's: Roy Center & Lee Kelly Drosophila Handbook

Rose, Michael R.

232

X-Ray CT Image Reconstruction via Wavelet Frame Based Regularization and Radon Domain  

E-Print Network [OSTI]

to reconstruct high quality CT images from limited and noisy projection data. One of the common CT systems Bin Dong Jia Li Zuowei Shen December 22, 2011 Abstract X-ray computed tomography (CT) has been,8]. Numerical simulations and comparisons will be presented at the end. Keywords: Computed tomography, wavelet

Zakharov, Vladimir

233

Syngas production in a novel methane dry reformer by utilizing of tri-reforming process for energy supplying: Modeling and simulation  

Science Journals Connector (OSTI)

Abstract In this study, tri-reforming process has been utilized as an energy source for driving highly endothermic process of methane dry reforming process in a multi-tubular recuperative thermally coupled reactor (TCTDR). 184 two-concentric-tubes have been proposed for this configuration. Outer tube sides of the two-concentric-tubes have been considered for the tri-reforming reactions while dry reforming process takes place in inner tube sides. Simulation results of co-current mode have been compared with corresponding predictions of thermally coupled tri- and steam reformer (TCTSR); in which the tri-reforming process has been coupled with steam reforming of methane in same conditions. A mathematical heterogeneous model has been applied to simulate both dry and tri-reforming sides of the TCTDR. Results showed that methane conversion at the output of dry and tri-reforming sides reached to 63% and 93%, respectively. Also, molar flow rate of syngas at the output of DR side of TCTDR reached to 7464 kmol h?1 in comparison to 3912 kmol h?1 for SR side of TCTSR.

Mehdi Farniaei; Mohsen Abbasi; Hamid Rahnama; Mohammad Reza Rahimpour; Alireza Shariati

2014-01-01T23:59:59.000Z

234

Quantitative cone-beam CT imaging in radiation therapy using planning CT as a prior: First patient studies  

SciTech Connect (OSTI)

Purpose: Quantitative cone-beam CT (CBCT) imaging is on increasing demand for high-performance image guided radiation therapy (IGRT). However, the current CBCT has poor image qualities mainly due to scatter contamination. Its current clinical application is therefore limited to patient setup based on only bony structures. To improve CBCT imaging for quantitative use, we recently proposed a correction method using planning CT (pCT) as the prior knowledge. Promising phantom results have been obtained on a tabletop CBCT system, using a correction scheme with rigid registration and without iterations. More challenges arise in clinical implementations of our method, especially because patients have large organ deformation in different scans. In this paper, we propose an improved framework to extend our method from bench to bedside by including several new components. Methods: The basic principle of our correction algorithm is to estimate the primary signals of CBCT projections via forward projection on the pCT image, and then to obtain the low-frequency errors in CBCT raw projections by subtracting the estimated primary signals and low-pass filtering. We improve the algorithm by using deformable registration to minimize the geometry difference between the pCT and the CBCT images. Since the registration performance relies on the accuracy of the CBCT image, we design an optional iterative scheme to update the CBCT image used in the registration. Large correction errors result from the mismatched objects in the pCT and the CBCT scans. Another optional step of gas pocket and couch matching is added into the framework to reduce these effects. Results: The proposed method is evaluated on four prostate patients, of which two cases are presented in detail to investigate the method performance for a large variety of patient geometry in clinical practice. The first patient has small anatomical changes from the planning to the treatment room. Our algorithm works well even without the optional iterations and the gas pocket and couch matching. The image correction on the second patient is more challenging due to the effects of gas pockets and attenuating couch. The improved framework with all new components is used to fully evaluate the correction performance. The enhanced image quality has been evaluated using mean CT number and spatial nonuniformity (SNU) error as well as contrast improvement factor. If the pCT image is considered as the ground truth, on the four patients, the overall mean CT number error is reduced from over 300 HU to below 16 HU in the selected regions of interest (ROIs), and the SNU error is suppressed from over 18% to below 2%. The average soft-tissue contrast is improved by an average factor of 2.6. Conclusions: We further improve our pCT-based CBCT correction algorithm for clinical use. Superior correction performance has been demonstrated on four patient studies. By providing quantitative CBCT images, our approach significantly increases the accuracy of advanced CBCT-based clinical applications for IGRT.

Niu Tianye; Al-Basheer, Ahmad; Zhu Lei [Nuclear and Radiological Engineering and Medical Physics Programs, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Georgia Radiation Therapy Center, Department of Radiology, Georgia Health Sciences University, Augusta, Georgia 30912 (United States); Nuclear and Radiological Engineering and Medical Physics Programs, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)

2012-04-15T23:59:59.000Z

235

Initial experience with single-source dual-energy CT abdominal angiography and comparison with single-energy CT angiography: image quality, enhancement, diagnosis and radiation dose  

Science Journals Connector (OSTI)

To assess image quality of virtual monochromatic spectral (VMS) images, compared to single-energy (SE) CT, and to evaluate the...

Daniella F. Pinho; Naveen M. Kulkarni; Arun Krishnaraj…

2013-02-01T23:59:59.000Z

236

Recent developments of the ion sources at Tri University Meson Factory/Isotope Separator and ACcelerator Facility  

SciTech Connect (OSTI)

This paper describes the recent progresses concerning the on-line ion source at the Tri University Meson Factory/Isotope Separator and ACcelerator (TRIUMF/ISAC) Radioactive Ion-Beam Facility; description of the new design of the surface-ion-source for improved stability of the beam intensity, description of the transport path to the east target station at ISAC, description of the new brazing techniques that solved recurrent problems with water leaks on the target/ion source assembly in the vacuum system, finally, recent developments concerning the Forced Electron Beam Induced Arc Discharge (FEBIAD) ion source are reported. In particular, a study on the effect of the plasma chamber volume on the ionization efficiency was completed.

Bricault, P. G.; Ames, F.; Dombsky, M.; Labrecque, F.; Lassen, J.; Mjos, A.; Minor, G. [TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada); Tigelhoefer, A. [TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada); Department Of Physics, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada)

2012-02-15T23:59:59.000Z

237

Assessment of Summer RBOB Supply for NY & CT  

Gasoline and Diesel Fuel Update (EIA)

Update of Summer Reformulated Gasoline Supply Update of Summer Reformulated Gasoline Supply Assessment for New York and Connecticut May 5, 2004 In October 2003, EIA published a review of the status of the methyl tertiary butyl ether (MTBE) ban transition in New York (NY) and Connecticut (CT) 1 that noted significant uncertainties in gasoline supply for those States for the summer of 2004. To obtain updated information, EIA spoke to major suppliers to the two States over the past several months as the petroleum industry began the switch from winter- to summer-grade gasoline. As discussed on our earlier report, the NY and CT bans on MTBE mainly affect reformulated gasoline (RFG), which in recent years has been provided by domestic refineries on the East Coast (PADD 1) and imports. Our recent findings indicate that

238

Effective dose estimation during conventional and CT urography  

Science Journals Connector (OSTI)

Abstract Intravenous urography (IVU) and CT urography (CTU) are efficient radiological examinations for the evaluation of the urinary system disorders. However patients are exposed to a significant radiation dose. The objectives of this study are to: (i) measure and compare patient radiation dose by computed tomography urography (CTU) and conventional intravenous urography (IVU) and (ii) evaluate organ equivalent dose and cancer risks from CTU and IVU imaging procedures. A total of 141 patients were investigated. A calibrated CT machine (Siemens-Somatom Emotion duo) was used for CTU, while a Shimadzu X ray machine was used for IVU. Thermoluminescence dosimeters (TLD-GR200A) were used to measure patients' entrance surface doses (ESD). \\{TLDs\\} were calibrated under reproducible reference conditions. Patients radiation dose values (DLP) for CTU were 172±61 mGy cm, \\{CTDIvol\\} 4.75±2 mGy and effective dose 2.58±1 mSv. Patient cancer probabilities were estimated to be 1.4 per million per CTU examination. Patients \\{ESDs\\} values for IVU were 21.62±5 mGy, effective dose 1.79±1 mSv. CT involves a higher effective dose than IVU. In this study the radiation dose is considered low compared to previous studies. The effective dose from CTU procedures was 30% higher compared to IVU procedures. Wide dose variation between patient doses suggests that optimization is not fulfilled yet.

K. Alzimami; A. Sulieman; E. Omer; I.I. Suliman; K. Alsafi

2014-01-01T23:59:59.000Z

239

Algae's Second Try  

Science Journals Connector (OSTI)

...says. As a result, despite algae's advantages, he and others...bring those costs down, making algae more efficient by changing the...more energy-rich oils for biodiesel, such as soybean and oil palm...Technology Roadmap. Fast-growing algae, on the other hand, can produce...

Robert F. Service

2011-09-02T23:59:59.000Z

240

Non-medical Uses of Computed Tomography (CT) and Nuclear Magnetic Resonance  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Non-medical Uses of Computed Tomography (CT) Non-medical Uses of Computed Tomography (CT) and Nuclear Magnetic Resonance (NMR) Resources with Additional Information Computed Tomography (CT) Scanner CT Scanner - Courtesy Stanford University Department of Energy Resources Engineering Computed tomography (CT) and Nuclear Magnetic Resonance (NMR) have been used to resolve industrial problems, for materials characterizations, and to provide non-destructive evaluations for discovering flaws in parts before their use, resulting in greater reliability and greater safety for workers; to identify the presence and facilitate the recovery/extraction of oil, water, coal, and/or gas; and to provide non-destructive testing and quality control of fresh fruits and vegetables, enhancing the safety of food. These benefits of non-medical uses of CT and NMR contribute to the economy and improve people's lives.

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Learning from the experiments that never happened: Lessons from trying to conduct randomized evaluations of matching grant programs in Africa  

Science Journals Connector (OSTI)

Abstract Matching grants are one of the most common policy instruments used by developing country governments to try to foster technological upgrading, innovation, exports, use of business development services and other activities leading to firm growth. However, since they involve subsidizing firms, the risk is that they could crowd out private investment, subsidizing activities that firms were planning to undertake anyway, or lead to pure private gains, rather than generating the public gains that justify government intervention. As a result, rigorous evaluation of the effects of such programs is important. We attempted to implement randomized experiments to evaluate the impact of seven matching grant programs offered in six African countries, but in each case we were unable to complete an experimental evaluation. One critique of development research is publication bias, whereby only “interesting” results get published. Our hope is to mitigate this bias by learning from the experiments that never happened. We describe the three main proximate reasons for lack of implementation: continued project delays, politicians not willing to allow random assignment, and low program take-up; and then delve into the underlying causes of these occurring. Political economy, overly stringent eligibility criteria that do not take account of where value-added may be highest, a lack of attention to detail in “last mile” issues, incentives facing project implementation staff, and the way impact evaluations are funded, and all help explain the failure of randomization. We draw lessons from these experiences for both the implementation and the possible evaluation of future projects.

Francisco Campos; Aidan Coville; Ana M. Fernandes; Markus Goldstein; David McKenzie

2014-01-01T23:59:59.000Z

242

A Fossilized Opal A To Opal C-T Transformation On The Northeast...  

Open Energy Info (EERE)

Fossilized Opal A To Opal C-T Transformation On The Northeast Atlantic Margin- Support For A Significantly Elevated Palaeogeothermal Gradient During The Neogene? Jump to:...

243

Quantification of liver iron content with CT—added value of dual-energy  

Science Journals Connector (OSTI)

To evaluate the value of dual-energy CT (DECT) with use of an ... decomposition algorithm for the quantification of liver iron content (LIC).

Michael A. Fischer; Caecilia S. Reiner; Dimitri Raptis; Olivio Donati…

2011-08-01T23:59:59.000Z

244

MIEDER, WOLFGANG. Proverbs: A Handbook. Westport, CT: Greenwood, 2004. 304 pp.  

E-Print Network [OSTI]

selecta bibliografía, Proverbs: A Handbook interesado en unWOLFGANG. Proverbs: A Handbook. Westport, CT: Greenwood,libros de referencia de Handbooks" publicado en el nueva la

Lee, Alejandro

2005-01-01T23:59:59.000Z

245

E-Print Network 3.0 - aided ct image Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

10 ARTICLE IN PRESS Computer-Aided Design ( ) Summary: a limited number of computed tomography (CT) images. The three-dimensional template geometry of a healthy... contour shown...

246

Simultaneous CT and SPECT tomography using CZT detectors  

DOE Patents [OSTI]

A method for simultaneous transmission x-ray computed tomography (CT) and single photon emission tomography (SPECT) comprises the steps of: injecting a subject with a tracer compound tagged with a .gamma.-ray emitting nuclide; directing an x-ray source toward the subject; rotating the x-ray source around the subject; emitting x-rays during the rotating step; rotating a cadmium zinc telluride (CZT) two-sided detector on an opposite side of the subject from the source; simultaneously detecting the position and energy of each pulsed x-ray and each emitted .gamma.-ray captured by the CZT detector; recording data for each position and each energy of each the captured x-ray and .gamma.-ray; and, creating CT and SPECT images from the recorded data. The transmitted energy levels of the x-rays lower are biased lower than energy levels of the .gamma.-rays. The x-ray source is operated in a continuous mode. The method can be implemented at ambient temperatures.

Paulus, Michael J. (Knoxville, TN); Sari-Sarraf, Hamed (Lubbock, TX); Simpson, Michael L. (Knoxville, TN); Britton, Jr., Charles L. (Alcoa, TN)

2002-01-01T23:59:59.000Z

247

Validation of Plaster Endocast Morphology Through 3D CT Image Analysis  

E-Print Network [OSTI]

Validation of Plaster Endocast Morphology Through 3D CT Image Analysis P. Thomas Schoenemann,1 by creating endo- casts out of rubber latex shells filled with plaster. The extent to which the method questions. Pairs of virtual endocasts (VEs) created from high-resolution CT scans of corresponding latex/plaster

Schoenemann, P. Thomas

248

Bone Surface Reconstruction From CT/MR Images Using Fast Marching and Level Set Methods1)  

E-Print Network [OSTI]

Bone Surface Reconstruction From CT/MR Images Using Fast Marching and Level Set Methods1) Istv surfaces reconstructed from MR volumes are shown. 1 Outline of the project One of our current projects steps of bone surface reconstruction from CT/MR slice images. 2 Main steps of reconstruction 2.1

Chetverikov, Dmitry

249

Multi-atlas Segmentation in Head and Neck CT Scans Amelia M. Arbisser  

E-Print Network [OSTI]

Multi-atlas Segmentation in Head and Neck CT Scans by Amelia M. Arbisser B.S., Computer Science of Engineering Thesis Committee #12;2 #12;Multi-atlas Segmentation in Head and Neck CT Scans by Amelia M, we employ an atlas of labeled training images. We register each of these images to the unlabeled

Golland, Polina

250

Accurate model-based high resolution cardiac image reconstruction in dual source CT  

Science Journals Connector (OSTI)

Cardiac imaging represents one of the most challenging imaging problems, requiring high spatial and temporal resolutions along with good tissue contrast. One of the newest clinical cardiac CT scanners incorporates two source-detector pairs in order to ... Keywords: cardiac, dual source CT, iterative method, model-based imaging

Synho Do; Sanghee Cho; W. Clem Karl; Mannudeep K. Kalra; Thomas J. Brady; Homer Pien

2009-06-01T23:59:59.000Z

251

Hemorrhage Slices Detection in Brain CT Images Ruizhe Liu, Chew Lim Tan, Tze Yun Leong  

E-Print Network [OSTI]

Hemorrhage Slices Detection in Brain CT Images Ruizhe Liu, Chew Lim Tan, Tze Yun Leong Department) scans are widely used in today's diagnosis of head traumas. It is effective to disclose the bleeding Tomography (CT) scans are widely used in today's diagnosis of head traumas. It is effective to disclose

Tan, Chew Lim

252

AUTOMATIC HEART ISOLATION FOR CT CORONARY VISUALIZATION USING G. Funka-Lea1  

E-Print Network [OSTI]

AUTOMATIC HEART ISOLATION FOR CT CORONARY VISUALIZATION USING GRAPH-CUTS G. Funka-Lea1 , Y. Boykov3 isolate the outer surface of the entire heart in Computer Tomogra- phy (CT) cardiac scans. Isolating the entire heart allows the coronary vessels on the surface of the heart to be easily visu- alized despite

Boykov, Yuri

253

GPU IMPLEMENTATION OF A 3D BAYESIAN CT ALGORITHM AND ITS APPLICATION ON REAL FOAM RECONSTRUCTION  

E-Print Network [OSTI]

Tomography (CT) [1, 3]. The limits of these meth- ods appear when the number of projections is small, and as well as any iterative algebraic meth- ods is the computation time and especially for projection solve is to reconstruct the object f from the projection data g collected by a cone beam 3D CT. The link

Paris-Sud XI, Université de

254

Searching Effective Parameters for Low-Dose CT Reconstruction by Ant Colony Optimization  

E-Print Network [OSTI]

, Eric Papenhausen and Klaus Mueller Abstract-- Low-dose Computed Tomography (CT) has been gaining. To cope with the limited data collected at 30% of standard radiation, low-dose CT reconstruction algorithms generally require several iterations of forward projection, back-projection and regularization

Mueller, Klaus

255

Locating the Eyes in CT Brain Scan Data Kostis Kaggelides, Peter J. Elliott  

E-Print Network [OSTI]

, a technique for locating the eyes in Computed Tomography brain scan data, is described. The objective and implemented an algorithm which automaticallyidenti es and locates the eyes in a Computed Tomography(CT) brainLocating the Eyes in CT Brain Scan Data Kostis Kaggelides, Peter J. Elliott IBM UK Scienti c Centre

Fisher, Bob

256

A direct method for air kerma–length product measurement in CT for verification of dose display calibrations  

Science Journals Connector (OSTI)

......kerma-length product measurement in CT for verification of dose display calibrations...kerma-length product measurement in CT for verification of dose display calibrations...practice, this means doing measurements in the standard phantoms......

Katja Merimaa; Hannu Järvinen; Mika Kortesniemi; Juhani Karppinen

2010-08-01T23:59:59.000Z

257

Non-medical Uses of Computed Tomography (CT) and Nuclear Magnetic Resonance  

Office of Scientific and Technical Information (OSTI)

Non-medical Uses of Computed Tomography (CT) and Nuclear Magnetic Resonance (NMR) Resources with Additional Information Computed Tomography (CT) Scanner CT Scanner - Courtesy Stanford University Department of Energy Resources Engineering Computed tomography (CT) and Nuclear Magnetic Resonance (NMR) have been used to resolve industrial problems, for materials characterizations, and to provide non-destructive evaluations for discovering flaws in parts before their use, resulting in greater reliability and greater safety for workers; to identify the presence and facilitate the recovery/extraction of oil, water, coal, and/or gas; and to provide non-destructive testing and quality control of fresh fruits and vegetables, enhancing the safety of food. These benefits of non-medical uses of CT and NMR contribute to the economy and improve people's lives.

258

CT effective dose per dose length product using ICRP 103 weighting factors  

SciTech Connect (OSTI)

Purpose: To generate effective dose per unit dose length product (E/DLP) conversion factors incorporating ICRP Publication 103 tissue weighting factors. Methods: Effective doses for CT examinations were obtained using the IMPACT Dosimetry Calculator using all 23 dose data sets that are offered by this spreadsheet. CT examinations were simulated for scans performed along the patient long axis for each dosimetry data set using a 4 cm beam width ranging from the upper thighs to top of the head. Five basic body regions (head, neck, chest, abdomen, and pelvis), as well as combinations of the regions (head/neck, chest/abdomen, abdomen/pelvis, and chest/abdomen/pelvis) and whole body CT scans were investigated. Correction factors were generated that can be applied to convert E/DLP conversion factors based on ICRP 60 data to conversion factors that are valid for ICRP 103 data (i.e., E{sub 103}/E{sub 60}). Results: Use of ICRP 103 weighting factors increase effective doses for head scans by {approx}11%, for chest scans by {approx}20%, and decrease effective doses for pelvis scans by {approx}25%. Current E/DLP conversion factors are estimated to be 2.4 {mu}Sv/mGy cm for head CT examinations and range between 14 and 20 {mu}Sv/mGy cm for body CT examinations. Conclusions: Factors that enable patient CT doses to be adjusted to account for ICRP 103 tissue weighting factors are provided, which result in E/DLP factors that were increased in head and chest CT, reduced in pelvis CT, and showed no marked change in neck and abdomen CT.

Huda, Walter; Magill, Dennise; He Wenjun [Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina 29425 (United States); Department of Bioengineering, Clemson-MUSC Bioengineering Program, Clemson University, Charleston, South Carolina 29425 (United States)

2011-03-15T23:59:59.000Z

259

Joining semi-closed gas turbine cycle and tri-reforming: SCGT-TRIREF as a proposal for low CO2 emissions powerplants  

Science Journals Connector (OSTI)

Methane conversion to a rich H2 fuel by reforming reactions is a largely applied industrial process. Recently, it has been considered for applications combined to gas turbine powerplants, as a mean for (I) chemical recuperation (i.e. chemical looping CRGT) and (II) decarbonising the primary fuel and make the related power cycle a low CO2 releaser. The possibility of enhancing methane conversion by the addition of CO2 to the steam reactant flow (i.e. tri-reforming) has been assessed and showed interesting results. When dealing with gas turbines, the possibility of applying tri-reforming is related to the availability of some CO2 into the fluegas going to the reformer. This happens in semi-closed gas turbine cycles (SCGT), where the fluegas has a typical 14–15% CO2 mass content. The possibility of joining CRGT and SCGT technologies to improve methane reforming and propose an innovative, low CO2 emissions gas turbine cycle was assessed here. One of the key issues of this joining is also the possibility of greatly reduce the external water consumption due to the reforming, as the SCGT is a water producer cycle. The SCGT-TRIREF cycle is an SCGT cycle where fuel tri-reforming is applied. The steam due to the reformer is generated by the vaporization of the condensed water coming out from the fluegas condensing heat exchanger, upstream the main compressor, where the exhausts are cooled down and partially recirculated. The heat due to the steam generation is recuperated from the turbine exhausts cooling. The reforming process is partially sustained by the heat recovered from the turbine exhausts (which generates superheated steam) and partially by the auto thermal reactions of methane with fresh air, coming from the compressor (i.e. partial combustion). The effect of CO2 on methane reforming (tri-reforming effect) increases with decreasing steam/methane ratio: at very low values, around 30% of methane is converted by reactions with CO2. At high values of steam/methane ratio, the steam reforming reactions are dominant and only a marginal fraction of methane is interested to tri-reforming. Under optimised conditions, which can be reached at relatively high pressure ratios (25–30), the power cycle showed a potential efficiency around 46% and specific work at 550 kJ/kg level. When the amine CO2 capture is applied, the specific CO2 emissions range between 45 and 55 g CO 2 / kW h .

Daniele Fiaschi; Andrea Baldini

2009-01-01T23:59:59.000Z

260

10 A.M. CT TODAY: On-the Record Conference Call for Obama Administration to  

Broader source: Energy.gov (indexed) [DOE]

A.M. CT TODAY: On-the Record Conference Call for Obama A.M. CT TODAY: On-the Record Conference Call for Obama Administration to Announce Major Initiative to Enhance America's Energy Security 10 A.M. CT TODAY: On-the Record Conference Call for Obama Administration to Announce Major Initiative to Enhance America's Energy Security August 16, 2011 - 9:52am Addthis White House Rural Economic Council Promotes Production of Next Generation Biofuels, Job Creation and Economic Opportunity WASHINGTON, Aug. 16, 2011 - Today at 10 a.m. CT (11 a.m. ET), the Obama Administration will advance a major initiative to produce next generation aviation and marine biofuels to power military and commercial transportation. The initiative responds to a directive from President Obama issued in March as part of his Blueprint for a Secure Energy Future, the

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While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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261

A Fossilized Opal A To Opal C-T Transformation On The Northeast Atlantic  

Open Energy Info (EERE)

Fossilized Opal A To Opal C-T Transformation On The Northeast Atlantic Fossilized Opal A To Opal C-T Transformation On The Northeast Atlantic Margin- Support For A Significantly Elevated Palaeogeothermal Gradient During The Neogene? Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Fossilized Opal A To Opal C-T Transformation On The Northeast Atlantic Margin- Support For A Significantly Elevated Palaeogeothermal Gradient During The Neogene? Details Activities (0) Areas (0) Regions (0) Abstract: Rock samples-collected from a recent deep-water exploration well drilled in the Faeroe-Shetland Channel, northwest of the UK-confirm that a distinctive high-amplitude seismic reflector that crosscuts the Upper Palaeogene and Neogene succession and covers an area of 10 000 km(2) is an example of a fossilized Opal A to Opal C/T (Cristobalite/Tridymite)

262

American Ref-Fuel of SE CT Biomass Facility | Open Energy Information  

Open Energy Info (EERE)

American Ref-Fuel of SE CT Biomass Facility American Ref-Fuel of SE CT Biomass Facility Jump to: navigation, search Name American Ref-Fuel of SE CT Biomass Facility Facility American Ref-Fuel of SE CT Sector Biomass Facility Type Municipal Solid Waste Location New London County, Connecticut Coordinates 41.5185189°, -72.0468164° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.5185189,"lon":-72.0468164,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

263

Low-Dose Spiral CT Scans for Early Lung Cancer Detection  

Broader source: Energy.gov [DOE]

Low-dose spiral computed tomography (CT) scanning is a noninvasive medical imaging test that has been used for the early detection of lung cancer for over 16 years (Sone et al. 1998; Henschke et.al. 1999).

264

DOE Zero Energy Ready Home Case Study: BPC Green Builders, Danbury, CT  

Broader source: Energy.gov [DOE]

Case study of a DOE Zero Energy Ready home in Danbury, CT, that scored HERS 35 without PV. This 2-story, 1,650-ft2 cabin built by a custom home builder for his own family meets Passive House...

265

RIS-M-2586 ELASTIC-PLASTIC FRACTURE MECHANICS ANALYSIS OF A CT-SPECIMEN  

E-Print Network [OSTI]

RISÃ?-M-2586 ELASTIC-PLASTIC FRACTURE MECHANICS ANALYSIS OF A CT-SPECIMEN - A TWO-DIMENSIONAL APPROACH Gunner C. Larsen Abstract. This report documents the results obtained from an elastic-plastic

266

Dental CT: imaging technique, anatomy, and pathologic conditions of the jaws  

Science Journals Connector (OSTI)

In addition to conventional imaging methods, dental CT has become an established method for anatomic imaging of the jaws prior to dental implant placement. More recently, this high- ... resolution imaging techni...

André Gahleitner; G. Watzek; H. Imhof

2003-02-01T23:59:59.000Z

267

Finite Element Analysis of Ballistic Penetration of Plain Weave Twaron CT709® Fabrics: A Parametric Study  

E-Print Network [OSTI]

The ballistic impact of Twaron CT709® plain weave fabrics is studied using an explicit finite element method. Many existing approximations pertaining to woven fabrics cannot adequately represent strain rate-dependent behavior exhibited by the Twaron...

Gogineni, Sireesha

2011-10-21T23:59:59.000Z

268

The effects of mapping CT images to Monte Carlo materials on GEANT4 proton simulation accuracy  

SciTech Connect (OSTI)

Purpose: Monte Carlo simulations of radiation therapy require conversion from Hounsfield units (HU) in CT images to an exact tissue composition and density. The number of discrete densities (or density bins) used in this mapping affects the simulation accuracy, execution time, and memory usage in GEANT4 and other Monte Carlo code. The relationship between the number of density bins and CT noise was examined in general for all simulations that use HU conversion to density. Additionally, the effect of this on simulation accuracy was examined for proton radiation. Methods: Relative uncertainty from CT noise was compared with uncertainty from density binning to determine an upper limit on the number of density bins required in the presence of CT noise. Error propagation analysis was also performed on continuously slowing down approximation range calculations to determine the proton range uncertainty caused by density binning. These results were verified with Monte Carlo simulations. Results: In the presence of even modest CT noise (5 HU or 0.5%) 450 density bins were found to only cause a 5% increase in the density uncertainty (i.e., 95% of density uncertainty from CT noise, 5% from binning). Larger numbers of density bins are not required as CT noise will prevent increased density accuracy; this applies across all types of Monte Carlo simulations. Examining uncertainty in proton range, only 127 density bins are required for a proton range error of <0.1 mm in most tissue and <0.5 mm in low density tissue (e.g., lung). Conclusions: By considering CT noise and actual range uncertainty, the number of required density bins can be restricted to a very modest 127 depending on the application. Reducing the number of density bins provides large memory and execution time savings in GEANT4 and other Monte Carlo packages.

Barnes, Samuel; McAuley, Grant; Slater, James [Department of Radiation Medicine, Loma Linda University, Loma Linda, California 92350 (United States); Wroe, Andrew [Department of Radiation Medicine, Loma Linda University Medical Center, Loma Linda, California 92350 (United States)

2013-04-15T23:59:59.000Z

269

TriBITS lifecycle model. Version 1.0, a lean/agile software lifecycle model for research-based computational science and engineering and applied mathematical software.  

SciTech Connect (OSTI)

Software lifecycles are becoming an increasingly important issue for computational science and engineering (CSE) software. The process by which a piece of CSE software begins life as a set of research requirements and then matures into a trusted high-quality capability is both commonplace and extremely challenging. Although an implicit lifecycle is obviously being used in any effort, the challenges of this process - respecting the competing needs of research vs. production - cannot be overstated. Here we describe a proposal for a well-defined software lifecycle process based on modern Lean/Agile software engineering principles. What we propose is appropriate for many CSE software projects that are initially heavily focused on research but also are expected to eventually produce usable high-quality capabilities. The model is related to TriBITS, a build, integration and testing system, which serves as a strong foundation for this lifecycle model, and aspects of this lifecycle model are ingrained in the TriBITS system. Here, we advocate three to four phases or maturity levels that address the appropriate handling of many issues associated with the transition from research to production software. The goals of this lifecycle model are to better communicate maturity levels with customers and to help to identify and promote Software Engineering (SE) practices that will help to improve productivity and produce better software. An important collection of software in this domain is Trilinos, which is used as the motivation and the initial target for this lifecycle model. However, many other related and similar CSE (and non-CSE) software projects can also make good use of this lifecycle model, especially those that use the TriBITS system. Indeed this lifecycle process, if followed, will enable large-scale sustainable integration of many complex CSE software efforts across several institutions.

Willenbring, James M.; Bartlett, Roscoe Ainsworth (Oak Ridge National Laboratory, Oak Ridge, TN); Heroux, Michael Allen

2012-01-01T23:59:59.000Z

270

Solvent Extraction Behavior of Neptunium (IV) Ions between Nitric Acid and Diluted 30% Tri-butyl Phosphate in the Presence of Simple Hydroxamic Acids  

SciTech Connect (OSTI)

Formo- and aceto-hydroxamic acids are very effective reagents for stripping tetravalent actinide ions such as Np(IV) and Pu(IV) ions from a tri-butyl phosphate phase into nitric acid. Distribution data for Np(IV) in the presence of these hydroxamate ions have now been accumulated and trends established. Stability constants for aceto-hydroxamate complexes of Np(IV) and Np(V) ions have also been determined in a perchlorate medium, and these reaffirm the affinity of hydroxamate ligands for actinide (IV) ions over actinyl (V,VI) ions.

Taylor, Robin J.; Sinkov, Sergey I.; Choppin, Gregory R.; May, Iain

2008-01-15T23:59:59.000Z

271

Auto calibration of a cone-beam-CT  

SciTech Connect (OSTI)

Purpose: This paper introduces a novel autocalibration method for cone-beam-CTs (CBCT) or flat-panel CTs, assuming a perfect rotation. The method is based on ellipse-fitting. Autocalibration refers to accurate recovery of the geometric alignment of a CBCT device from projection images alone, without any manual measurements. Methods: The authors use test objects containing small arbitrarily positioned radio-opaque markers. No information regarding the relative positions of the markers is used. In practice, the authors use three to eight metal ball bearings (diameter of 1 mm), e.g., positioned roughly in a vertical line such that their projection image curves on the detector preferably form large ellipses over the circular orbit. From this ellipse-to-curve mapping and also from its inversion the authors derive an explicit formula. Nonlinear optimization based on this mapping enables them to determine the six relevant parameters of the system up to the device rotation angle, which is sufficient to define the geometry of a CBCT-machine assuming a perfect rotational movement. These parameters also include out-of-plane rotations. The authors evaluate their method by simulation based on data used in two similar approaches [L. Smekal, M. Kachelriess, S. E, and K. Wa, 'Geometric misalignment and calibration in cone-beam tomography,' Med. Phys. 31(12), 3242-3266 (2004); K. Yang, A. L. C. Kwan, D. F. Miller, and J. M. Boone, 'A geometric calibration method for cone beam CT systems,' Med. Phys. 33(6), 1695-1706 (2006)]. This allows a direct comparison of accuracy. Furthermore, the authors present real-world 3D reconstructions of a dry human spine segment and an electronic device. The reconstructions were computed from projections taken with a commercial dental CBCT device having two different focus-to-detector distances that were both calibrated with their method. The authors compare their reconstruction with a reconstruction computed by the manufacturer of the CBCT device to demonstrate the achievable spatial resolution of their calibration procedure. Results: Compared to the results published in the most closely related work [K. Yang, A. L. C. Kwan, D. F. Miller, and J. M. Boone, 'A geometric calibration method for cone beam CT systems,' Med. Phys. 33(6), 1695-1706 (2006)], the simulation proved the greater accuracy of their method, as well as a lower standard deviation of roughly 1 order of magnitude. When compared to another similar approach [L. Smekal, M. Kachelriess, S. E, and K. Wa, 'Geometric misalignment and calibration in cone-beam tomography,' Med. Phys. 31(12), 3242-3266 (2004)], their results were roughly of the same order of accuracy. Their analysis revealed that the method is capable of sufficiently calibrating out-of-plane angles in cases of larger cone angles when neglecting these angles negatively affects the reconstruction. Fine details in the 3D reconstruction of the spine segment and an electronic device indicate a high geometric calibration accuracy and the capability to produce state-of-the-art reconstructions. Conclusions: The method introduced here makes no requirements on the accuracy of the test object. In contrast to many previous autocalibration methods their approach also includes out-of-plane rotations of the detector. Although assuming a perfect rotation, the method seems to be sufficiently accurate for a commercial CBCT scanner. For devices which require higher dimensional geometry models, the method could be used as a initial calibration procedure.

Gross, Daniel; Heil, Ulrich; Schulze, Ralf; Schoemer, Elmar; Schwanecke, Ulrich [Department of Design, Computer Science and Media, RheinMain University of Applied Sciences, 65195 Wiesbaden, Germany and Institute of Computer Science, Johannes Gutenberg University Mainz, 55128 Mainz (Germany); Department of Oral Surgery (and Oral Radiology), University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz (Germany); Institute of Computer Science, Johannes Gutenberg University Mainz, 55128 Mainz (Germany); Department of Design, Computer Science and Media, RheinMain University of Applied Sciences, 65195 Wiesbaden (Germany)

2012-10-15T23:59:59.000Z

272

Conversion of the energy-subtracted CT number to electron density based on a single linear relationship: an experimental verification using a clinical dual-source CT scanner  

Science Journals Connector (OSTI)

In radiotherapy treatment planning, the conversion of the computed tomography (CT) number to electron density is one of the main processes that determine the accuracy of patient dose calculations. However, in general, the CT number and electron density of tissues cannot be interrelated using a simple one-to-one correspondence. This study aims to experimentally verify the clinical feasibility of an existing novel conversion method proposed by the author of this note, which converts the energy-subtracted CT number (?HU) to the relative electron density (?e) via a single linear relationship by using a dual-energy CT (DECT). The ?HU–?e conversion was performed using a clinical second-generation dual-source CT scanner operated in the dual-energy mode with tube potentials of 80 kV and 140 kV with and without an additional tin filter. The ?HU–?e calibration line was obtained from the DECT image acquisition for tissue substitutes in an electron density phantom. In addition, the effect of object size on ?HU–?e conversion was also experimentally investigated. The plot of the measured ?HU versus nominal ?e values exhibited a single linear relationship over a wide ?e range from 0.00 (air) to 2.35 (aluminum). The ?HU–?e conversion performed with the tin filter yielded a lower dose and more reliable ?e values that were less affected by the object-size variation when compared to the corresponding values obtained for the case without the tin filter.

Masayoshi Tsukihara; Yoshiyuki Noto; Takahide Hayakawa; Masatoshi Saito

2013-01-01T23:59:59.000Z

273

Phenomenology of lepton-nucleus DIS  

E-Print Network [OSTI]

The results of recent phenomenological studies of unpolarized nuclear deep-inelastic scattering are discussed and applied to calculate neutrino charged-current structure functions and cross sections for a number of nuclei.

S. A. Kulagin; R. Petti

2006-02-10T23:59:59.000Z

274

DISEASES OF AQUATIC ORGANISMS Dis Aquat Org  

E-Print Network [OSTI]

, Thomas J. Poorten1 1 Department of Biological Sciences, University of Idaho, Moscow, Idaho 83844, USA 2 to hypothesized strain differences in virulence? The scientific effort targeted toward answering these questions

Rosenblum, Erica Bree

275

Towards small x resummed DIS phenomenology  

E-Print Network [OSTI]

We report on recent progress towards quantitative phenomenology of small x resummation of deep-inelastic structure functions. We compute small x resummed K-factors with realistic PDFs and estimate their impact in the HERA kinematical region. These K-factors, which match smoothly to the fixed order NLO results, approximately reproduce the effect of a small x resummed PDF analysis. Typical corrections are found to be of the same order as the NNLO ones, that is, a few percent, but with opposite sign. These results imply that resummation corrections could be relevant for a global PDF analysis, especially with the very precise combined HERA dataset.

Juan Rojo; Guido Altarelli; Richard D. Ball; Stefano Forte

2009-07-02T23:59:59.000Z

276

First pass cable artefact correction for cardiac C-arm CT imaging  

Science Journals Connector (OSTI)

Cardiac C-arm CT imaging delivers a tomographic region-of-interest reconstruction of the patient's heart during image guided catheter interventions. Due to the limited size of the flat detector a volume image is reconstructed, which is truncated in the cone-beam (along the patient axis) and the fan-beam (in the transaxial plane) direction. To practically address this local tomography problem correction methods, like projection extension, are available for first pass image reconstruction. For second pass correction methods, like metal artefact reduction, alternative correction schemes are required when the field of view is limited to a region-of-interest of the patient. In classical CT imaging metal artefacts are corrected by metal identification in a first volume reconstruction and generation of a corrected projection data set followed by a second reconstruction. This approach fails when the metal structures are located outside the reconstruction field of view. When a C-arm CT is performed during a cardiac intervention pacing leads and other cables are frequently positioned on the patients skin, which results in propagating streak artefacts in the reconstruction volume. A first pass approach to reduce this type of artefact is introduced and evaluated here. It makes use of the fact that the projected position of objects outside the reconstruction volume changes with the projection perspective. It is shown that projection based identification, tracking and removal of high contrast structures like cables, only detected in a subset of the projections, delivers a more consistent reconstruction volume with reduced artefact level. The method is quantitatively evaluated based on 50 simulations using cardiac CT data sets with variable cable positioning. These data sets are forward projected using a C-arm CT system geometry and generate artefacts comparable to those observed in clinical cardiac C-arm CT acquisitions. A C-arm CT simulation of every cardiac CT data set without cables served as a ground truth. The 3D root mean square deviation between the simulated data set with and without cables could be reduced for 96% of the simulated cases by an average of 37% (min ?9%, max 73%) when using the first pass correction method. In addition, image quality improvement is demonstrated for clinical whole heart C-arm CT data sets when the cable removal algorithm was applied.

C Haase; D Schäfer; M Kim; S J Chen; J D Carroll; P Eshuis; O Dössel; M Grass

2014-01-01T23:59:59.000Z

277

Adaptive mean filtering for noise reduction in CT polymer gel dosimetry  

SciTech Connect (OSTI)

X-ray computed tomography (CT) as a method of extracting 3D dose information from irradiated polymer gel dosimeters is showing potential as a practical means to implement gel dosimetry in a radiation therapy clinic. However, the response of CT contrast to dose is weak and noise reduction is critical in order to achieve adequate dose resolutions with this method. Phantom design and CT imaging technique have both been shown to decrease image noise. In addition, image postprocessing using noise reduction filtering techniques have been proposed. This work evaluates in detail the use of the adaptive mean filter for reducing noise in CT gel dosimetry. Filter performance is systematically tested using both synthetic patterns mimicking a range of clinical dose distribution features as well as actual clinical dose distributions. Both low and high signal-to-noise ratio (SNR) situations are examined. For all cases, the effects of filter kernel size and the number of iterations are investigated. Results indicate that adaptive mean filtering is a highly effective tool for noise reduction CT gel dosimetry. The optimum filtering strategy depends on characteristics of the dose distributions and image noise level. For low noise images (SNR {approx}20), the filtered results are excellent and use of adaptive mean filtering is recommended as a standard processing tool. For high noise images (SNR {approx}5) adaptive mean filtering can also produce excellent results, but filtering must be approached with more caution as spatial and dose distortions of the original dose distribution can occur.

Hilts, Michelle; Jirasek, Andrew [Medical Physics, BC Cancer Agency-Vancouver Island Centre, Victoria, British Columbia, V8R6V5 (Canada); Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, V8W2Y2 (Canada)

2008-01-15T23:59:59.000Z

278

Malignant pleural mesothelioma: value of CT and MR imaging in predicting resectability  

SciTech Connect (OSTI)

OBJECTIVE. The objective was to determine if CT or MR imaging findings could be used to accurately predict resectability in patients with biopsy-proved malignant pleural mesotheliomas. SUBJECTS AND METHODS. CT and MR findings in 41 consecutive patients with malignant mesotheliomas who were referred to the thoracic surgery clinic for extrapleural pneumonectomy were studied by thoracic radiologists before surgery. Review of radiologic studies focused on local invasion of three separate regions: the diaphragm, chest wall, and mediastinum. Results of all imaging examinations were carefully correlated with intraoperative, gross, and microscopic pathologic findings. RESULTS. After radiologic and clinical evaluation, 34 patients (83%) had thoracotomy; 24 of these had tumors that were resectable. The sensitivity was high (> 90%) for both CT and MR in each region. Specificity, however, was low, probably because of the small number of patients with unresectable tumors. CONCLUSION. CT and MR provided similar information on resectability in most cases. Sensitivity was high for both procedures. Because CT is more widely available and used, the authors suggest it as the initial study when determining resectability. In difficult cases, important complementary anatomic information can be derived from MR images obtained before surgical intervention.

Patz, E.F. Jr.; Shaffer, K.; Piwnica-Worms, D.R.; Jochelson, M.; Sarin, M.; Sugarbaker, D.J.; Pugatch, R.D. (Department of Radiology, Brigham and Women's Hospital, Boston, MA (United States))

1992-11-01T23:59:59.000Z

279

3D Dose Verification Using Tomotherapy CT Detector Array  

SciTech Connect (OSTI)

Purpose: To evaluate a three-dimensional dose verification method based on the exit dose using the onboard detector of tomotherapy. Methods and Materials: The study included 347 treatment fractions from 24 patients, including 10 prostate, 5 head and neck (HN), and 9 spinal stereotactic body radiation therapy (SBRT) cases. Detector sonograms were retrieved and back-projected to calculate entrance fluence, which was then forward-projected on the CT images to calculate the verification dose, which was compared with ion chamber and film measurement in the QA plans and with the planning dose in patient plans. Results: Root mean square (RMS) errors of 2.0%, 2.2%, and 2.0% were observed comparing the dose verification (DV) and the ion chamber measured point dose in the phantom plans for HN, prostate, and spinal SBRT patients, respectively. When cumulative dose in the entire treatment is considered, for HN patients, the error of the mean dose to the planning target volume (PTV) varied from 1.47% to 5.62% with a RMS error of 3.55%. For prostate patients, the error of the mean dose to the prostate target volume varied from -5.11% to 3.29%, with a RMS error of 2.49%. The RMS error of maximum doses to the bladder and the rectum were 2.34% (-4.17% to 2.61%) and 2.64% (-4.54% to 3.94%), respectively. For the nine spinal SBRT patients, the RMS error of the minimum dose to the PTV was 2.43% (-5.39% to 2.48%). The RMS error of maximum dose to the spinal cord was 1.05% (-2.86% to 0.89%). Conclusions: An excellent agreement was observed between the measurement and the verification dose. In the patient treatments, the agreement in doses to the majority of PTVs and organs at risk is within 5% for the cumulative treatment course doses. The dosimetric error strongly depends on the error in multileaf collimator leaf opening time with a sensitivity correlating to the gantry rotation period.

Sheng Ke, E-mail: ks2mc@virginia.edu [Department of Radiation Oncology, University of Virginia, Charlottesville, VA (United States); Jones, Ryan; Yang Wensha; Saraiya, Siddharth; Schneider, Bernard [Department of Radiation Oncology, University of Virginia, Charlottesville, VA (United States); Chen Quan; Sobering, Geoff; Olivera, Gustavo [TomoTherapy, Inc., Madison, WI (United States); Read, Paul [Department of Radiation Oncology, University of Virginia, Charlottesville, VA (United States)

2012-02-01T23:59:59.000Z

280

Cost, Energy Use, and Emissions of Tri-Generation Systems - DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

7 7 FY 2012 Annual Progress Report DOE Hydrogen and Fuel Cells Program Mark F. Ruth* (Primary Contact), Michael E. Goldsby † , Timothy J. Sa † , Victor Diakov* *National Renewable Energy Laboratory 15013 Denver West Pkwy. Golden, CO 80401 Phone: (303) 817-6160 Email: Mark.Ruth@nrel.gov † Sandia National Laboratories DOE Manager HQ: Fred Joseck Phone: (202) 586-7932 Email: Fred.Joseck@ee.doe.gov Project Start Date: December 1, 2010 Project End Date: October 31, 2011 Fiscal Year (FY) 2012 Objectives Develop a macro-system model (MSM): * Aimed at performing rapid cross-cutting analysis - Utilizing and linking other models - Improving consistency between models - Incorporate tri-generation systems into the MSM and * develop a methodology for MSM users to analyze

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Modeling of the simultaneous extraction of nitric acid and uranyl nitrate with tri-n-butyl phosphate. Application to extraction operation  

SciTech Connect (OSTI)

A mathematical model developed for the equilibrium HNO{sub 3}-UO{sub 2}(NO{sub 3}){sub 2}-tri-n-butyl phosphate (TBP)-diluent is the basis of the computation of distribution isotherms. The isotherms are used to study the influence of TBP concentration on two chosen operation parameters, distribution coefficients and number of theoretical stages, for the selected flow sheets. It is established that an increase in TBP concentration leads to a decrease in the number of theoretical stages for the extraction flow sheets but to their increase for the striping flow sheets. Given diagrams can be used to determine the efficiency of extraction processes. Agreement with available literature calculations on the number of theoretical stages supports the use of the model in the computation of distribution isotherms, of the system quoted above, in a wide range of nitric acid, uranyl nitrate, and TBP concentrations.

Comor, J.J.; Tolic, A.S.; Kopecni, M.M.; Petkovic, D.M. [Vinca Inst. of Nuclear Sciences, Belgrade (Yugoslavia). Chemical Dynamics Lab.] [Vinca Inst. of Nuclear Sciences, Belgrade (Yugoslavia). Chemical Dynamics Lab.

1999-01-01T23:59:59.000Z

282

Application of the optically stimulated luminescence (OSL) technique for mouse dosimetry in micro-CT imaging  

SciTech Connect (OSTI)

Purpose: Micro-CT is considered to be a powerful tool to investigate various models of disease on anesthetized animals. In longitudinal studies, the radiation dose delivered by the micro-CT to the same animal is a major concern as it could potentially induce spurious effects in experimental results. Optically stimulated luminescence dosimeters (OSLDs) are a relatively new kind of detector used in radiation dosimetry for medical applications. The aim of this work was to assess the dose delivered by the CT component of a micro-SPECT (single-photon emission computed tomography)/CT camera during a typical whole-body mouse study, using commercially available OSLDs based on Al{sub 2}O{sub 3}:C crystals.Methods: CTDI (computed tomography dose index) was measured in micro-CT with a properly calibrated pencil ionization chamber using a rat-like phantom (60 mm in diameter) and a mouse-like phantom (30 mm in diameter). OSLDs were checked for reproducibility and linearity in the range of doses delivered by the micro-CT. Dose measurements obtained with OSLDs were compared to those of the ionization chamber to correct for the radiation quality dependence of OSLDs in the low-kV range. Doses to tissue were then investigated in phantoms and cadavers. A 30 mm diameter phantom, specifically designed to insert OSLDs, was used to assess radiation dose over a typical whole-body mouse imaging study. Eighteen healthy female BALB/c mice weighing 27.1 ± 0.8 g (1 SD) were euthanized for small animal measurements. OLSDs were placed externally or implanted internally in nine different locations by an experienced animal technician. Five commonly used micro-CT protocols were investigated.Results: CTDI measurements were between 78.0 ± 2.1 and 110.7 ± 3.0 mGy for the rat-like phantom and between 169.3 ± 4.6 and 203.6 ± 5.5 mGy for the mouse-like phantom. On average, the displayed CTDI at the operator console was underestimated by 1.19 for the rat-like phantom and 2.36 for the mouse-like phantom. OSLDs exhibited a reproducibility of 2.4% and good linearity was found between 60 and 450 mGy. The energy scaling factor was calculated to be between 1.80 ± 0.16 and 1.86 ± 0.16, depending on protocol used. In phantoms, mean doses to tissue over a whole-body CT examination were ranging from 186.4 ± 7.6 to 234.9 ± 7.1 mGy. In mice, mean doses to tissue in the mouse trunk (thorax, abdomen, pelvis, and flanks) were between 213.0 ± 17.0 and 251.2 ± 13.4 mGy. Skin doses (3 OSLDs) were much higher with average doses between 350.6 ± 25.3 and 432.5 ± 34.1 mGy. The dose delivered during a topogram was found to be below 10 mGy. Use of the multimouse bed of the system gave a significantly 20%–40% lower dose per animal (p < 0.05).Conclusions: Absorbed doses in micro-CT were found to be relatively high. In micro-SPECT/CT imaging, the micro-CT unit is mainly used to produce a localization frame. As a result, users should pay attention to adjustable CT parameters so as to minimize the radiation dose and avoid any adverse radiation effects which may interfere with biological parameters studied.

Vrigneaud, Jean-Marc; Courteau, Alan; Oudot, Alexandra; Collin, Bertrand [Department of Nuclear Medicine, Centre Georges-François Leclerc, 1 rue Professeur Marion, Dijon 21079 Cedex (France)] [Department of Nuclear Medicine, Centre Georges-François Leclerc, 1 rue Professeur Marion, Dijon 21079 Cedex (France); Ranouil, Julien [Landauer Europe, 33 avenue du Général Leclerc, Fontenay-aux-Roses 92266 Cedex (France)] [Landauer Europe, 33 avenue du Général Leclerc, Fontenay-aux-Roses 92266 Cedex (France); Morgand, Loïc; Raguin, Olivier [Oncodesign, 20 rue Jean Mazen, Dijon 21076 Cedex (France)] [Oncodesign, 20 rue Jean Mazen, Dijon 21076 Cedex (France); Walker, Paul [LE2i CNRS UMR 5158, Faculty of Medicine, BP 87900, 21079 Dijon Cedex (France)] [LE2i CNRS UMR 5158, Faculty of Medicine, BP 87900, 21079 Dijon Cedex (France); Brunotte, François [Department of Nuclear Medicine, Centre Georges-François Leclerc, 1 rue Professeur Marion, Dijon 21079 Cedex, France and LE2i CNRS UMR 5158, Faculty of Medicine, BP 87900, 21079 Dijon Cedex (France)] [Department of Nuclear Medicine, Centre Georges-François Leclerc, 1 rue Professeur Marion, Dijon 21079 Cedex, France and LE2i CNRS UMR 5158, Faculty of Medicine, BP 87900, 21079 Dijon Cedex (France)

2013-12-15T23:59:59.000Z

283

Dynamic cone beam CT angiography of carotid and cerebral arteries using canine model  

SciTech Connect (OSTI)

Purpose: This research is designed to develop and evaluate a flat-panel detector-based dynamic cone beam CT system for dynamic angiography imaging, which is able to provide both dynamic functional information and dynamic anatomic information from one multirevolution cone beam CT scan. Methods: A dynamic cone beam CT scan acquired projections over four revolutions within a time window of 40 s after contrast agent injection through a femoral vein to cover the entire wash-in and wash-out phases. A dynamic cone beam CT reconstruction algorithm was utilized and a novel recovery method was developed to correct the time-enhancement curve of contrast flow. From the same data set, both projection-based subtraction and reconstruction-based subtraction approaches were utilized and compared to remove the background tissues and visualize the 3D vascular structure to provide the dynamic anatomic information. Results: Through computer simulations, the new recovery algorithm for dynamic time-enhancement curves was optimized and showed excellent accuracy to recover the actual contrast flow. Canine model experiments also indicated that the recovered time-enhancement curves from dynamic cone beam CT imaging agreed well with that of an IV-digital subtraction angiography (DSA) study. The dynamic vascular structures reconstructed using both projection-based subtraction and reconstruction-based subtraction were almost identical as the differences between them were comparable to the background noise level. At the enhancement peak, all the major carotid and cerebral arteries and the Circle of Willis could be clearly observed. Conclusions: The proposed dynamic cone beam CT approach can accurately recover the actual contrast flow, and dynamic anatomic imaging can be obtained with high isotropic 3D resolution. This approach is promising for diagnosis and treatment planning of vascular diseases and strokes.

Cai Weixing; Zhao Binghui; Conover, David; Liu Jiangkun; Ning Ruola [Department of Imaging Sciences, University of Rochester, 601 Elmwood Avenue, Rochester, New York 14642 (United States); Department of Radiology, Shanghai 6th People's Hospital, 600 Yishan Road, Xuhui, Shanghai (China); Koning Corporation, Lennox Tech Enterprise Center, 150 Lucius Gordon Drive Suite 112, West Henrietta, New York 14586 (United States); Department of Imaging Sciences, University of Rochester, 601 Elmwood Avenue, Rochester, New York 14642 (United States); Department of Imaging Sciences, University of Rochester, 601 Elmwood Avenue, Rochester, New York 14642 (United States) and Koning Corporation, Lennox Tech Enterprise Center, 150 Lucius Gordon Drive Suite 112, West Henrietta, New York 14586 (United States)

2012-01-15T23:59:59.000Z

284

Correction of CT artifacts and its influence on Monte Carlo dose calculations  

SciTech Connect (OSTI)

Computed tomography (CT) images of patients having metallic implants or dental fillings exhibit severe streaking artifacts. These artifacts may disallow tumor and organ delineation and compromise dose calculation outcomes in radiotherapy. We used a sinogram interpolation metal streaking artifact correction algorithm on several phantoms of exact-known compositions and on a prostate patient with two hip prostheses. We compared original CT images and artifact-corrected images of both. To evaluate the effect of the artifact correction on dose calculations, we performed Monte Carlo dose calculation in the EGSnrc/DOSXYZnrc code. For the phantoms, we performed calculations in the exact geometry, in the original CT geometry and in the artifact-corrected geometry for photon and electron beams. The maximum errors in 6 MV photon beam dose calculation were found to exceed 25% in original CT images when the standard DOSXYZnrc/CTCREATE calibration is used but less than 2% in artifact-corrected images when an extended calibration is used. The extended calibration includes an extra calibration point for a metal. The patient dose volume histograms of a hypothetical target irradiated by five 18 MV photon beams in a hypothetical treatment differ significantly in the original CT geometry and in the artifact-corrected geometry. This was found to be mostly due to miss-assignment of tissue voxels to air due to metal artifacts. We also developed a simple Monte Carlo model for a CT scanner and we simulated the contribution of scatter and beam hardening to metal streaking artifacts. We found that whereas beam hardening has a minor effect on metal artifacts, scatter is an important cause of these artifacts.

Bazalova, Magdalena; Beaulieu, Luc; Palefsky, Steven; Verhaegen, Frank [Medical Physics Department, McGill University, Montreal General Hospital, 1650 Cedar Avenue, Montreal, Quebec, H3G1A4 (Canada); Department de Physique, de Genie Physique et d'Optique, Universite Laval, Quebec City, Quebec, G1K7P4 (Canada) and Department de Radio-Oncologie, Hotel Dieu de Quebec, Centre Hospitalier Universitaire de Quebec, Quebec City, Quebec, G1R2J6 (Canada); Medical Physics Department, McGill University, Montreal General Hospital, 1650 Cedar Avenue, Montreal, Quebec, H3G1A4 (Canada)

2007-06-15T23:59:59.000Z

285

Resolution enhancement of lung 4D-CT data using multiscale interphase iterative nonlocal means  

SciTech Connect (OSTI)

Purpose: Four-dimensional computer tomography (4D-CT) has been widely used in lung cancer radiotherapy due to its capability in providing important tumor motion information. However, the prolonged scanning duration required by 4D-CT causes considerable increase in radiation dose. To minimize the radiation-related health risk, radiation dose is often reduced at the expense of interslice spatial resolution. However, inadequate resolution in 4D-CT causes artifacts and increases uncertainty in tumor localization, which eventually results in extra damages of healthy tissues during radiotherapy. In this paper, the authors propose a novel postprocessing algorithm to enhance the resolution of lung 4D-CT data. Methods: The authors' premise is that anatomical information missing in one phase can be recovered from the complementary information embedded in other phases. The authors employ a patch-based mechanism to propagate information across phases for the reconstruction of intermediate slices in the longitudinal direction, where resolution is normally the lowest. Specifically, the structurally matching and spatially nearby patches are combined for reconstruction of each patch. For greater sensitivity to anatomical details, the authors employ a quad-tree technique to adaptively partition the image for more fine-grained refinement. The authors further devise an iterative strategy for significant enhancement of anatomical details. Results: The authors evaluated their algorithm using a publicly available lung data that consist of 10 4D-CT cases. The authors' algorithm gives very promising results with significantly enhanced image structures and much less artifacts. Quantitative analysis shows that the authors' algorithm increases peak signal-to-noise ratio by 3-4 dB and the structural similarity index by 3%-5% when compared with the standard interpolation-based algorithms. Conclusions: The authors have developed a new algorithm to improve the resolution of 4D-CT. It outperforms the conventional interpolation-based approaches by producing images with the markedly improved structural clarity and greatly reduced artifacts.

Zhang Yu [School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China and Department of Radiology and BRIC, University of North Carolina, Chapel Hill, North Carolina 27599 (United States); Yap, Pew-Thian; Wu Guorong [Department of Radiology and BRIC, University of North Carolina, Chapel Hill, North Carolina 27599 (United States); Feng Qianjin; Chen Wufan [School of Biomedical Engineering, Southern Medical University, Guangzhou 510515 (China); Lian Jun [Department of Radiation Oncology, University of North Carolina, Chapel Hill, North Carolina 27599 (United States); Shen Dinggang [Department of Radiology and BRIC, University of North Carolina, Chapel Hill, North Carolina 27599 (United States); Department of Brain and Cognitive Engineering, Korea University, Seoul 136-713 (Korea, Republic of)

2013-05-15T23:59:59.000Z

286

Resolution enhancement of lung 4D-CT via group-sparsity  

SciTech Connect (OSTI)

Purpose: 4D-CT typically delivers more accurate information about anatomical structures in the lung, over 3D-CT, due to its ability to capture visual information of the lung motion across different respiratory phases. This helps to better determine the dose during radiation therapy for lung cancer. However, a critical concern with 4D-CT that substantially compromises this advantage is the low superior-inferior resolution due to less number of acquired slices, in order to control the CT radiation dose. To address this limitation, the authors propose an approach to reconstruct missing intermediate slices, so as to improve the superior-inferior resolution.Methods: In this method the authors exploit the observation that sampling information across respiratory phases in 4D-CT can be complimentary due to lung motion. The authors’ approach uses this locally complimentary information across phases in a patch-based sparse-representation framework. Moreover, unlike some recent approaches that treat local patches independently, the authors’ approach employs the group-sparsity framework that imposes neighborhood and similarity constraints between patches. This helps in mitigating the trade-off between noise robustness and structure preservation, which is an important consideration in resolution enhancement. The authors discuss the regularizing ability of group-sparsity, which helps in reducing the effect of noise and enables better structural localization and enhancement.Results: The authors perform extensive experiments on the publicly available DIR-Lab Lung 4D-CT dataset [R. Castillo, E. Castillo, R. Guerra, V. Johnson, T. McPhail, A. Garg, and T. Guerrero, “A framework for evaluation of deformable image registration spatial accuracy using large landmark point sets,” Phys. Med. Biol. 54, 1849–1870 (2009)]. First, the authors carry out empirical parametric analysis of some important parameters in their approach. The authors then demonstrate, qualitatively as well as quantitatively, the ability of their approach to achieve more accurate and better localized results over bicubic interpolation as well as a related state-of-the-art approach. The authors also show results on some datasets with tumor, to further emphasize the clinical importance of their method.Conclusions: The authors have proposed to improve the superior-inferior resolution of 4D-CT by estimating intermediate slices. The authors’ approach exploits neighboring constraints in the group-sparsity framework, toward the goal of achieving better localization and noise robustness. The authors’ results are encouraging, and positively demonstrate the role of group-sparsity for 4D-CT resolution enhancement.

Bhavsar, Arnav; Wu, Guorong; Shen, Dinggang [Department of Radiology and BRIC, University of North Carolina, Chapel Hill, North Carolina 27599 (United States)] [Department of Radiology and BRIC, University of North Carolina, Chapel Hill, North Carolina 27599 (United States); Lian, Jun [Department of Radiation Oncology, University of North Carolina, Chapel Hill, North Carolina 27599 (United States)] [Department of Radiation Oncology, University of North Carolina, Chapel Hill, North Carolina 27599 (United States)

2013-12-15T23:59:59.000Z

287

Tri-Generation Success World's First Tri-Gen  

E-Print Network [OSTI]

station uses anaerobically digested biogas from the municipal wastewater treatment plant as the fuel SAE protocols for rapid 3-minute complete tank refueling. Gas or Biogas H2 is produced at anode Gas the versatility of fuel cells to utilize multiple feedstocks, such as biogas and natural gas, to produce power

288

Phase I and Pharmacokinetic Study of CT-322 (BMS-844203), a Targeted Adnectin Inhibitor of VEGFR-2 Based on a Domain of Human Fibronectin  

Science Journals Connector (OSTI)

...Bristol-Myers Squibb, Princeton, New Jersey Note: Supplementary...or biweekly (q2w). Plasma samples were assayed for CT-322 concentrations, plasma VEGF-A concentrations...kg qw or q2w. CT-322 plasma concentrations increased...

Anthony W. Tolcher; Christopher J. Sweeney; Kyri Papadopoulos; Amita Patnaik; Elena G. Chiorean; Alain C. Mita; Kamalesh Sankhala; Eric Furfine; Jochem Gokemeijer; Lisa Iacono; Cheryl Eaton; Bruce A. Silver; and Monica Mita

2011-01-15T23:59:59.000Z

289

Patterns of Colorectal Cancer Test Use, Including CT Colonography, in the 2010 National Health Interview Survey  

Science Journals Connector (OSTI)

...Trial of the American College of Radiology Imaging Network (ACRIN), CT...for one type of service such as dental care, vision care, or prescriptions...Cancer, and American College of Radiology.Radiology 2008;248:717-20. 9. Johnson...

Jean A. Shapiro; Carrie N. Klabunde; Trevor D. Thompson; Marion R. Nadel; Laura C. Seeff; and Arica White

2012-06-01T23:59:59.000Z

290

DOE Zero Energy Ready Home Case Study: Brookside Development, Derby, CT  

Broader source: Energy.gov [DOE]

Case study of a DOE Zero Energy Ready home in Derby, CT, that achieves a HERS score of 45 without PV or HERS 26 with PV. The production home is one of a development of 7 two-story, 4,000+-ft2...

291

A semi-automatic semantic method for mapping SNOMED CT concepts to VCM icons  

E-Print Network [OSTI]

A semi-automatic semantic method for mapping SNOMED CT concepts to VCM icons Jean-Baptiste Lamya of Concept in Medicine) is an iconic lan- guage for representing key medical concepts by icons. How- ever icons to the terms of these terminologies. Here, we present and evaluate a semi-automatic semantic

Paris-Sud XI, Université de

292

DAWN: A JOURNEY TO THE BEGINNING OF THE SOLAR SYSTEM C.T. Russell(1)  

E-Print Network [OSTI]

-ray/neutron spectrometer, a magnetometer and a gravity investigation. Dawn uses solar arrays to power its xenon ion engine solar panels roughly 21 m tip-to-tip, a 5 m magnetometer boom and three ion thrusters, one of whichDAWN: A JOURNEY TO THE BEGINNING OF THE SOLAR SYSTEM C.T. Russell(1) , A. Coradini(2) , W

Zuber, Maria

293

Multi-energy CT Based on a Prior Rank, Intensity and Sparsity Model (PRISM)  

E-Print Network [OSTI]

Multi-energy CT Based on a Prior Rank, Intensity and Sparsity Model (PRISM) Hao Gao1 , Hengyong Yu2 spectrum. Besides, the energy-dependent intensity information can be incorporated into the PRISM in terms on the generalized rank and sparsity of a multi-energy image, and intensity/spectral characteristics of base

Soatto, Stefano

294

Investigation of energy weighting using an energy discriminating photon counting detector for breast CT  

SciTech Connect (OSTI)

Purpose: Breast CT is an emerging imaging technique that can portray the breast in 3D and improve visualization of important diagnostic features. Early clinical studies have suggested that breast CT has sufficient spatial and contrast resolution for accurate detection of masses and microcalcifications in the breast, reducing structural overlap that is often a limiting factor in reading mammographic images. For a number of reasons, image quality in breast CT may be improved by use of an energy resolving photon counting detector. In this study, the authors investigate the improvements in image quality obtained when using energy weighting with an energy resolving photon counting detector as compared to that with a conventional energy integrating detector.Methods: Using computer simulation, realistic CT images of multiple breast phantoms were generated. The simulation modeled a prototype breast CT system using an amorphous silicon (a-Si), CsI based energy integrating detector with different x-ray spectra, and a hypothetical, ideal CZT based photon counting detector with capability of energy discrimination. Three biological signals of interest were modeled as spherical lesions and inserted into breast phantoms; hydroxyapatite (HA) to represent microcalcification, infiltrating ductal carcinoma (IDC), and iodine enhanced infiltrating ductal carcinoma (IIDC). Signal-to-noise ratio (SNR) of these three lesions was measured from the CT reconstructions. In addition, a psychophysical study was conducted to evaluate observer performance in detecting microcalcifications embedded into a realistic anthropomorphic breast phantom.Results: In the energy range tested, improvements in SNR with a photon counting detector using energy weighting was higher (than the energy integrating detector method) by 30%–63% and 4%–34%, for HA and IDC lesions and 12%–30% (with Al filtration) and 32%–38% (with Ce filtration) for the IIDC lesion, respectively. The average area under the receiver operating characteristic curve (AUC) for detection of microcalcifications was higher by greater than 19% (for the different energy weighting methods tested) as compared to the AUC obtained with an energy integrating detector.Conclusions: This study showed that breast CT with a CZT photon counting detector using energy weighting can provide improvements in pixel SNR, and detectability of microcalcifications as compared to that with a conventional energy integrating detector. Since a number of degrading physical factors were not modeled into the photon counting detector, this improvement should be considered as an upper bound on achievable performance.

Kalluri, Kesava S. [Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts 01655 and Biomedical Engineering and Biotechnology Program, University of Massachusetts, Lowell, One University Avenue, Lowell, Massachusetts 01854 (United States)] [Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts 01655 and Biomedical Engineering and Biotechnology Program, University of Massachusetts, Lowell, One University Avenue, Lowell, Massachusetts 01854 (United States); Mahd, Mufeed [Biomedical Engineering and Biotechnology Program, University of Massachusetts, Lowell, One University Avenue, Lowell, Massachusetts 01854 (United States)] [Biomedical Engineering and Biotechnology Program, University of Massachusetts, Lowell, One University Avenue, Lowell, Massachusetts 01854 (United States); Glick, Stephen J. [Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts 01655 (United States)] [Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts 01655 (United States)

2013-08-15T23:59:59.000Z

295

Comparison of blood flow models and acquisitions for quantitative myocardial perfusion estimation from dynamic CT  

Science Journals Connector (OSTI)

Myocardial blood flow (MBF) can be estimated from dynamic contrast enhanced (DCE) cardiac CT acquisitions, leading to quantitative assessment of regional perfusion. The need for low radiation dose and the lack of consensus on MBF estimation methods motivates this study to refine the selection of acquisition protocols and models for CT-derived MBF. DCE cardiac CT acquisitions were simulated for a range of flow states (MBF = 0.5, 1, 2, 3 ml (min g)?1, cardiac output = 3, 5, 8 L min?1). Patient kinetics were generated by a mathematical model of iodine exchange incorporating numerous physiological features including heterogenenous microvascular flow, permeability and capillary contrast gradients. CT acquisitions were simulated for multiple realizations of realistic x-ray flux levels. CT acquisitions that reduce radiation exposure were implemented by varying both temporal sampling (1, 2, and 3 s sampling intervals) and tube currents (140, 70, and 25 mAs). For all acquisitions, we compared three quantitative MBF estimation methods (two-compartment model, an axially-distributed model, and the adiabatic approximation to the tissue homogeneous model) and a qualitative slope-based method. In total, over 11 000 time attenuation curves were used to evaluate MBF estimation in multiple patient and imaging scenarios. After iodine-based beam hardening correction, the slope method consistently underestimated flow by on average 47.5% and the quantitative models provided estimates with less than 6.5% average bias and increasing variance with increasing dose reductions. The three quantitative models performed equally well, offering estimates with essentially identical root mean squared error (RMSE) for matched acquisitions. MBF estimates using the qualitative slope method were inferior in terms of bias and RMSE compared to the quantitative methods. MBF estimate error was equal at matched dose reductions for all quantitative methods and range of techniques evaluated. This suggests that there is no particular advantage between quantitative estimation methods nor to performing dose reduction via tube current reduction compared to temporal sampling reduction. These data are important for optimizing implementation of cardiac dynamic CT in clinical practice and in prospective CT MBF trials.

Michael Bindschadler; Dimple Modgil; Kelley R Branch; Patrick J La Riviere; Adam M Alessio

2014-01-01T23:59:59.000Z

296

Lack of Correlation Between External Fiducial Positions and Internal Tumor Positions During Breath-Hold CT  

SciTech Connect (OSTI)

Purpose: For thoracic tumors, if four-dimensional computed tomography (4DCT) is unavailable, the internal margin can be estimated by use of breath-hold (BH) CT scans acquired at end inspiration (EI) and end expiration (EE). By use of external surrogates for tumor position, BH accuracy is estimated by minimizing the difference between respiratory extrema BH and mean equivalent-phase free breathing (FB) positions. We tested the assumption that an external surrogate for BH accuracy correlates with internal tumor positional accuracy during BH CT. Methods and Materials: In 16 lung cancer patients, 4DCT images, as well as BH CT images at EI and EE, were acquired. Absolute differences between BH and mean equivalent-phase (FB) positions were calculated for both external fiducials and gross tumor volume (GTV) centroids as metrics of external and internal BH accuracy, respectively, and the results were correlated. Results: At EI, the absolute difference between mean FB and BH fiducial displacement correlated poorly with the absolute difference between FB and BH GTV centroid positions on CT images (R{sup 2} = 0.11). Similarly, at EE, the absolute difference between mean FB and BH fiducial displacements correlated poorly with the absolute difference between FB and BH GTV centroid positions on CT images (R{sup 2} = 0.18). Conclusions: External surrogates for tumor position are not an accurate metric of BH accuracy for lung cancer patients. This implies that care should be taken when using such an approach because an incorrect internal margin could be generated.

Hunjan, Sandeep, E-mail: shunjan@mdanderson.or [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Starkschall, George; Prado, Karl; Dong Lei; Balter, Peter [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States)

2010-04-15T23:59:59.000Z

297

Transport study of hafnium(IV) and zirconium(IV) ions mutual separation by using Tri-n-butyl phosphate-xylene-based supported liquid membranes  

SciTech Connect (OSTI)

A Hf transport study through supported liquid membranes has been carried out to determine flux and permeability data for this metal ion. Tri-n-butyl phosphate (TBP)-xylene-based liquid membranes supported in polypropylene hydrophobic microporous film have been used. These data for hafnium and the previous data for zirconium have furnished the Zr to Hf flux ratio (S) as a function of nitric acid and TBP concentrations of the order of 12 in a single stage at room temperature. Optimum conditions for the separation of these two metal ions appear to 5-6 TBP mol/dm{sup 3} HNO{sub 3}, concentrations {le} 2.93 mol/dm{sup 3}, and 10C. The value of S from an aqueous solution containing 2.4% Hf with respect to Zr has been found to be >125 at 10C and 1.78 mol/dm{sup 3} TBP concentration in the membrane. The technique appears to be feasible for purification of Zr respect to Hf or vice versa.

Chaudry, M.A.; Ahmed, B. (Pakistan Inst. of Nuclear Science and Technology, Islamabad (Pakistan))

1992-02-01T23:59:59.000Z

298

Interfractional Prostate Shifts: Review of 1870 Computed Tomography (CT) Scans Obtained During Image-Guided Radiotherapy Using CT-on-Rails for the Treatment of Prostate Cancer  

SciTech Connect (OSTI)

Purpose: To review 1870 CT scans of interfractional prostate shift obtained during image-guided radiotherapy. Methods and Materials: A total of 1870 pretreatment CT scans were acquired with CT-on-rails, and the corresponding shift data for 329 patients with prostate cancer were analyzed. Results: Of the 1870 scans reviewed, 44% required no setup adjustments in the anterior-posterior (AP) direction, 14% had shifts of 3-5 mm, 29% had shifts of 6-10 mm, and 13% had shifts of >10 mm. In the superior-inferior direction, 81% had no adjustments, 2% had shifts of 3-5 mm, 15% had shifts of 6-10 mm, and 2% had shifts of >10 mm. In the left-right direction, 65% had no adjustment, 13% had shifts of 3-5 mm, 17% had shifts of 6-10 mm, and 5% had shifts of >10 mm. Further analysis of the first 66 consecutive patients divided into three groups according to body mass index indicates that the shift in the AP direction for the overweight subgroup was statistically larger than those for the control and obese subgroups (p < 0.05). The interfractional shift in the lateral direction for the obese group (1 SD, 5.5 mm) was significantly larger than those for the overweight and control groups (4.1 and 2.9 mm, respectively) (p < 0.001). Conclusions: These data demonstrate that there is a significantly greater shift in the AP direction than in the lateral and superior-inferior directions for the entire patient group. Overweight and obese patient groups show a significant difference from the control group in terms of prostate shift.

Wong, James R. [Department of Radiation Oncology, Carol G. Simon Cancer Center, Morristown Memorial Hospital, Morristown, NJ (United States)], E-mail: james.wong@atlantichealth.org; Gao Zhanrong [Department of Radiation Oncology, Carol G. Simon Cancer Center, Morristown Memorial Hospital, Morristown, NJ (United States); Uematsu, Minoru [Department of Radiation Oncology, UAS Oncology Center, Kagoshima (Japan); Merrick, Scott; Machernis, Nolan P.; Chen, Timothy; Cheng, C.W. [Department of Radiation Oncology, The Carol G. Simon Cancer Center, Morristown Memorial Hospital, Morristown, NJ (United States)

2008-12-01T23:59:59.000Z

299

Reference dosimetry during diagnostic CT examination using XR-QA radiochromic film model  

SciTech Connect (OSTI)

Purpose: The authors applied 2D reference dosimetry protocol for dose measurements using XR-QA radiochromic film model during diagnostic computed tomography (CT) examinations carried out on patients and humanoid Rando phantom. Methods: Response of XR-QA model GAFCHROMIC film reference dosimetry system was calibrated in terms of Air-Kerma in air. Four most commonly used CT protocols were selected on their CT scanner (GE Lightspeed VCT 64), covering three anatomical sites (head, chest, and abdomen). For each protocol, 25 patients ongoing planned diagnostic CT examination were recruited. Surface dose was measured using four or eight film strips taped on patients' skin and on Rando phantom. Film pieces were scanned prior to and after irradiation using Epson Expression 10000XL document scanner. Optical reflectance of the unexposed film piece was subtracted from exposed one to obtain final net reflectance change, which is subsequently converted to dose using previously established calibration curves. Results: The authors' measurements show that body skin dose variation has a sinusoidal pattern along the scanning axis due to the helical movement of the x-ray tube, and a comb pattern for head dose measurements due to its axial movement. Results show that the mean skin dose at anterior position for patients is (51 {+-} 6) mGy, (29 {+-} 11) mGy, (45 {+-} 13) mGy and (38 {+-} 20) mGy for head, abdomen, angio Abdomen, and chest and abdomen protocol (UP position), respectively. The obtained experimental dose length products (DLP) show higher values than CT based DLP taken from the scanner console for body protocols, but lower values for the head protocol. Internal dose measurements inside the phantom's head indicate nonuniformity of dose distribution within scanned volume. Conclusions: In this work, the authors applied an Air-Kerma in air based radiochromic film reference dosimetry protocol for in vivo skin dose measurements. In this work, they employed green channel extracted from the scanned RGB image for dose measurements in the range from 0 to 200 mGy. Measured skin doses and corresponding DLPs were higher than DLPs provided by the CT scanner manufacturer as they were measured on patients' skin.

Boivin, Jonathan; Tomic, Nada; Fadlallah, Bassam; DeBlois, Francois; Devic, Slobodan [Institut de Genie Biomedical, Universite de Montreal, Montreal, Quebec H3C 3J7 (Canada); Medical Physics Unit, McGill University, Montral, Quebec H3G 1A4, Canada and Department of Radiation Oncology, SMBD Jewish General Hospital, McGill University, 3755 chemin de la Cote-Sainte-Catherine, Montreal, Quebec H3T 1E2 (Canada); Department of Biomedical Engineering, SMBD Jewish General Hospital, McGill University, Montreal, Quebec H3T 1E2 (Canada); Medical Physics Unit, McGill University, Montreal, Quebec H3G 1A4, Canada and Department of Radiation Oncology, SMBD Jewish General Hospital, McGill University, Montreal, Quebec H3T 1E2 (Canada)

2011-09-15T23:59:59.000Z

300

MecE 390 How come Matlab gives a whole bunch of errors when I try to run one of the files from the course homepage on a computer  

E-Print Network [OSTI]

MecE 390 ­ How come Matlab gives a whole bunch of errors when I try to run one of the files from starting a new Matlab session, change your current folder to the newly created directory. This can be done by looking to the top of the Matlab terminal window to the small window that reads "Current Folder

Flynn, Morris R.

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301

Graystone Group Advertising, 2710 North Ave, Suite 200 Bridgeport, CT 06604 Phone: 8005440005 or 2035490060 Fax: 2035490061  

E-Print Network [OSTI]

Graystone Group Advertising, 2710 North Ave, Suite 200 Bridgeport, CT 06604 Phone: 8005440005 or 2035490060 Fax: 2035490061 Email: ads@graystoneadv.com Placing Recruitment Advertising To assist University departments with all recruitment and advertising needs, Clemson is now partnered

Bolding, M. Chad

302

Supplementary testing is not required on the cobas 4800 CT/NG test for Neisseria gonorrhoeae weak positive urogenital samples.  

Science Journals Connector (OSTI)

...not required on the cobas 4800 CT/NG test for Neisseria gonorrhoeae weak positive...gonorrhoeae (NG) nucleic acid amplification test (NAAT) results are difficult to interpret...treatment should be based on clinical pre-test probability.

Collette Bromhead; Nadika Liyanarachchy; Julia Mayes; Arlo Upton; Michelle Balm

2014-11-12T23:59:59.000Z

303

A method for measuring joint kinematics designed for accurate registration of kinematic data to models constructed from CT data  

E-Print Network [OSTI]

A method for measuring three-dimensional kinematics that incorporates the direct cross-registration of experimental kinematics with anatomic geometry from Computed Tomography (CT) data has been developed. Plexiglas ...

Fischer, Kenneth J.; Manson, T. T.; Pfaeffle, H. J.; Tomaino, M. M.; Woo, S. L-Y

2001-03-01T23:59:59.000Z

304

PET/CT com FDG-18 F em pacientes com suspeita de recidiva de carcinoma de ovário.  

E-Print Network [OSTI]

??O exame PET/CT com FDG-18F é um método de diagnóstico por imagem, útil em oncologia. O câncer de ovário é o câncer ginecológico de maior… (more)

Sanja Dragosavac

2011-01-01T23:59:59.000Z

305

Coronary artery wall imaging in mice using osmium tetroxide and micro-computed tomography (micro-CT)  

SciTech Connect (OSTI)

The high spatial resolution of micro-computed tomography (micro-CT) is ideal for 3D imaging of coronary arteries in intact mouse heart specimens. Previously, micro-CT of mouse heart specimens utilized intravascular contrast agents that hardened within the vessel lumen and allowed a vascular cast to be made. However, for mouse coronary artery disease models, it is highly desirable to image coronary artery walls and highlight plaques. For this purpose, we describe an ex vivo contrast-enhanced micro-CT imaging technique based on tissue staining with osmium tetroxide (OsO{sub 4}) solution. As a tissue-staining contrast agent, OsO{sub 4} is retained in the vessel wall and surrounding tissue during the fixation process and cleared from the vessel lumens. Its high X-ray attenuation makes the artery wall visible in CT. Additionally, since OsO{sub 4} preferentially binds to lipids, it highlights lipid deposition in the artery wall. We performed micro-CT of heart specimens of 5- to 25-week-old C57BL/6 wild-type mice and 5- to 13-week-old apolipoprotein E knockout (apoE{sup -/-}) mice at 10 {mu}m resolution. The results show that walls of coronary arteries as small as 45 {mu}m in diameter are visible using a table-top micro-CT scanner. Similar image clarity was achieved with 1/2000th the scan time using a synchrotron CT scanner. In 13-week-old apoE mice, lipid-rich plaques are visible in the aorta. Our study shows that the combination of OsO{sub 4} and micro-CT permits the visualization of the coronary artery wall in intact mouse hearts.

Pai, Vinay M.; Kozlowski, Megan; Donahue, Danielle; Miller, Elishiah; Xiao, Xianghui; Chen, Marcus Y.; Yu, Zu-Xi; Connelly, Patricia; Jeffries, Kenneth; Wen, Han (NIH)

2012-05-10T23:59:59.000Z

306

CT-Guided Interventions Using a Free-Hand, Optical Tracking System: Initial Clinical Experience  

SciTech Connect (OSTI)

PurposeThe present study was designed to evaluate the geometrical accuracy and clinical applicability of a new, free-hand, CT-guided, optical navigation system.MethodsFifteen procedures in 14 consecutive patients were retrospectively analyzed. The navigation system was applied for interventional procedures on small target lesions, in cases with long needle paths, narrow access windows, or when an out-of-plane access was expected. Mean lesion volume was 27.9 ml, and mean distance to target measured was 107.5 mm. Eleven of 15 needle trajectories were planned as out-of-plane approaches regarding the axial CT plane.ResultsNinety-one percent of the biopsies were diagnostic. All therapeutic interventions were technically successful. Targeting precision was high with a mean distance of the needle tip from planned target of 1.98 mm. Mean intervention time was 1:12 h. A statistically significant correlation between angular needle deviation and intervention time (p = 0.007), respiratory movement of the target (p = 0.008), and body mass index (p = 0.02) was detected. None of the evaluated parameters correlated significantly with the distance from the needle tip to the planned target.ConclusionsThe application of a navigation system for complex CT-guided procedures provided safe and effective targeting within a reasonable intervention time in our series.

Schubert, Tilman, E-mail: TSchubert@uhbs.ch; Jacob, Augustinus L.; Pansini, Michele [University Hospital Basel, Department of Radiology and Nuclear Medicine (Switzerland); Liu, David [Vancouver General Hospital, University of British Columbia, Department of Radiology (Canada); Gutzeit, Andreas [Winterthur Cantonal Hospital, Department of Radiology (Switzerland); Kos, Sebastian [University Hospital Basel, Department of Radiology and Nuclear Medicine (Switzerland)

2013-08-01T23:59:59.000Z

307

Development of a dynamic quality assurance testing protocol for multisite clinical trial DCE-CT accreditation  

SciTech Connect (OSTI)

Purpose: Credentialing can have an impact on whether or not a clinical trial produces useful quality data that is comparable between various institutions and scanners. With the recent increase of dynamic contrast enhanced-computed tomography (DCE-CT) usage as a companion biomarker in clinical trials, effective quality assurance, and control methods are required to ensure there is minimal deviation in the results between different scanners and protocols at various institutions. This paper attempts to address this problem by utilizing a dynamic flow imaging phantom to develop and evaluate a DCE-CT quality assurance (QA) protocol.Methods: A previously designed flow phantom, capable of producing predictable and reproducible time concentration curves from contrast injection was fully validated and then utilized to design a DCE-CT QA protocol. The QA protocol involved a set of quantitative metrics including injected and total mass error, as well as goodness of fit comparison to the known truth concentration curves. An additional region of interest (ROI) sensitivity analysis was also developed to provide additional details on intrascanner variability and determine appropriate ROI sizes for quantitative analysis. Both the QA protocol and ROI sensitivity analysis were utilized to test variations in DCE-CT results using different imaging parameters (tube voltage and current) as well as alternate reconstruction methods and imaging techniques. The developed QA protocol and ROI sensitivity analysis was then applied at three institutions that were part of clinical trial involving DCE-CT and results were compared.Results: The inherent specificity of robustness of the phantom was determined through calculation of the total intraday variability and determined to be less than 2.2 ± 1.1% (total calculated output contrast mass error) with a goodness of fit (R{sup 2}) of greater than 0.99 ± 0.0035 (n= 10). The DCE-CT QA protocol was capable of detecting significant deviations from the expected phantom result when scanning at low mAs and low kVp in terms of quantitative metrics (Injected Mass Error 15.4%), goodness of fit (R{sup 2}) of 0.91, and ROI sensitivity (increase in minimum input function ROI radius by 146 ± 86%). These tests also confirmed that the ASIR reconstruction process was beneficial in reducing noise without substantially increasing partial volume effects and that vendor specific modes (e.g., axial shuttle) did not significantly affect the phantom results. The phantom and QA protocol were finally able to quickly (<90 min) and successfully validate the DCE-CT imaging protocol utilized at the three separate institutions of a multicenter clinical trial; thereby enhancing the confidence in the patient data collected.Conclusions: A DCE QA protocol was developed that, in combination with a dynamic multimodality flow phantom, allows the intrascanner variability to be separated from other sources of variability such as the impact of injection protocol and ROI selection. This provides a valuable resource that can be utilized at various clinical trial institutions to test conformance with imaging protocols and accuracy requirements as well as ensure that the scanners are performing as expected for dynamic scans.

Driscoll, B. [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9 (Canada)] [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9 (Canada); Keller, H. [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9, Canada and Department of Radiation Oncology, University of Toronto, 150 College Street, Toronto, Ontario M5S 3E2 (Canada)] [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9, Canada and Department of Radiation Oncology, University of Toronto, 150 College Street, Toronto, Ontario M5S 3E2 (Canada); Jaffray, D.; Coolens, C. [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9 (Canada) [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9 (Canada); Department of Radiation Oncology, University of Toronto, 150 College Street, Toronto, Ontario M5S 3E2 (Canada); Techna Institute, University Health Network, 124-100 College Street, Toronto, Ontario M5G 1L5 (Canada)

2013-08-15T23:59:59.000Z

308

PET/CT for Radiotherapy Treatment Planning in Patients With Soft Tissue Sarcomas  

SciTech Connect (OSTI)

Purpose: To study the possibility of incorporating positron emission tomography/computed tomography (PET/CT) information into radiotherapy treatment planning in patients with high-grade soft tissue sarcomas (STS). Methods and Materials: We studied 17 patients treated with preoperative radiotherapy at our institution from 2005 to 2007. All patients had a high-grade STS and had had a staging PET/CT scan. For each patient, an MRI-based gross tumor volume (GTV), considered to be the contemporary standard for radiotherapy treatment planning, was outlined on a T1-gadolinium enhanced axial MRI (GTV{sub MRI}), and a second set of GTVs were outlined using different threshold values on PET images (GTV{sub PET}). PET-based target volumes were compared with the MRI-based GTV. Threshold values for target contouring were determined as a multiple (from 2 to 10 times) of the background soft tissue uptake values (B) sampled over healthy tissue. Results: PET-based GTVs contoured using a threshold value of 2 or 2.5 most closely resembled the GTV{sub MRI} volumes. Higher threshold values lead to PET volumes much smaller than the GTV{sub MRI}. The standard deviations between the average volumes of GTV{sub PET} and GTV{sub MRI} ratios for all thresholds were large, ranging from 36% for 2 xB up to 93% for 10 xB. Maximum uptake-to-background ratio correlated poorly with the maximum standardized uptake values. Conclusions: It is unlikely that PET/CT will make a significant contribution in GTV definition for radiotherapy treatment planning in patients with STS using threshold methods on PET images. Future studies will focus on molecular imaging and tumor physiology.

Karam, Irene [Department of Radiation Oncology, McGill University Health Centre, Montreal, Quebec (Canada); Devic, Slobodan [Department of Medical Physics, McGill University Health Centre, Montreal, Quebec (Canada); Hickeson, Marc [Department of Nuclear Medicine, McGill University Health Centre, Montreal, Quebec (Canada); Roberge, David [Department of Radiation Oncology, McGill University Health Centre, Montreal, Quebec (Canada); Turcotte, Robert E. [Department of Orthopedic Surgery, McGill University Health Centre, Montreal, Quebec (Canada); Freeman, Carolyn R., E-mail: carolyn.freeman@muhc.mcgill.c [Department of Radiation Oncology, McGill University Health Centre, Montreal, Quebec (Canada)

2009-11-01T23:59:59.000Z

309

Reference-free ground truth metric for metal artifact evaluation in CT images  

SciTech Connect (OSTI)

Purpose: In computed tomography (CT), metal objects in the region of interest introduce data inconsistencies during acquisition. Reconstructing these data results in an image with star shaped artifacts induced by the metal inconsistencies. To enhance image quality, the influence of the metal objects can be reduced by different metal artifact reduction (MAR) strategies. For an adequate evaluation of new MAR approaches a ground truth reference data set is needed. In technical evaluations, where phantoms can be measured with and without metal inserts, ground truth data can easily be obtained by a second reference data acquisition. Obviously, this is not possible for clinical data. Here, an alternative evaluation method is presented without the need of an additionally acquired reference data set. Methods: The proposed metric is based on an inherent ground truth for metal artifacts as well as MAR methods comparison, where no reference information in terms of a second acquisition is needed. The method is based on the forward projection of a reconstructed image, which is compared to the actually measured projection data. Results: The new evaluation technique is performed on phantom and on clinical CT data with and without MAR. The metric results are then compared with methods using a reference data set as well as an expert-based classification. It is shown that the new approach is an adequate quantification technique for artifact strength in reconstructed metal or MAR CT images. Conclusions: The presented method works solely on the original projection data itself, which yields some advantages compared to distance measures in image domain using two data sets. Beside this, no parameters have to be manually chosen. The new metric is a useful evaluation alternative when no reference data are available.

Kratz, Baerbel; Ens, Svitlana; Mueller, Jan; Buzug, Thorsten M. [Institute of Medical Engineering, University of Luebeck, 23538 Luebeck (Germany)

2011-07-15T23:59:59.000Z

310

Cost-Effectiveness of CT Screening in the National Lung Screening Trial  

Science Journals Connector (OSTI)

Lung cancer is the leading cause of cancer-related deaths in the United States; however, until recently, no method of screening had been shown to reduce mortality from lung cancer. The National Lung Screening Trial (NLST) showed that screening with low-dose helical computed tomography (CT) of the... The screening of persons at risk for lung cancer may reduce lung-cancer mortality by 20%. Although cost-effectiveness estimates vary widely depending on assumptions, a careful analysis indicates that the cost is $81,000 per quality-adjusted life-year.

Black W.C.; Gareen I.F.; Soneji S.S.

2014-11-06T23:59:59.000Z

311

Probability of Cancer in Pulmonary Nodules Detected on First Screening CT  

Science Journals Connector (OSTI)

...nodules; one-sided 97.5% CI, 0 to 0.006). The location of a nodule was evaluated according to lobar distribution. A larger number of nodules and a larger number of cancers were observed in the left upper and right upper lobes than in the left or right lower lobes or the right middle lobe (Table 1). For... Using data from two large data sets of lung-cancer screening by CT, the authors identified factors that increased the likelihood that a nodule was malignant, including older age, female sex, nodule location in the upper lobe, lower nodule count, and certain nodule features.

McWilliams A.; Tammemagi M.C.; Mayo J.R.

2013-09-05T23:59:59.000Z

312

Improving best-phase image quality in cardiac CT by motion correction with MAM optimization  

SciTech Connect (OSTI)

Purpose: Research in image reconstruction for cardiac CT aims at using motion correction algorithms to improve the image quality of the coronary arteries. The key to those algorithms is motion estimation, which is currently based on 3-D/3-D registration to align the structures of interest in images acquired in multiple heart phases. The need for an extended scan data range covering several heart phases is critical in terms of radiation dose to the patient and limits the clinical potential of the method. Furthermore, literature reports only slight quality improvements of the motion corrected images when compared to the most quiet phase (best-phase) that was actually used for motion estimation. In this paper a motion estimation algorithm is proposed which does not require an extended scan range but works with a short scan data interval, and which markedly improves the best-phase image quality. Methods: Motion estimation is based on the definition of motion artifact metrics (MAM) to quantify motion artifacts in a 3-D reconstructed image volume. The authors use two different MAMs, entropy, and positivity. By adjusting the motion field parameters, the MAM of the resulting motion-compensated reconstruction is optimized using a gradient descent procedure. In this way motion artifacts are minimized. For a fast and practical implementation, only analytical methods are used for motion estimation and compensation. Both the MAM-optimization and a 3-D/3-D registration-based motion estimation algorithm were investigated by means of a computer-simulated vessel with a cardiac motion profile. Image quality was evaluated using normalized cross-correlation (NCC) with the ground truth template and root-mean-square deviation (RMSD). Four coronary CT angiography patient cases were reconstructed to evaluate the clinical performance of the proposed method. Results: For the MAM-approach, the best-phase image quality could be improved for all investigated heart phases, with a maximum improvement of the NCC value by 100% and of the RMSD value by 81%. The corresponding maximum improvements for the registration-based approach were 20% and 40%. In phases with very rapid motion the registration-based algorithm obtained better image quality, while the image quality of the MAM algorithm was superior in phases with less motion. The image quality improvement of the MAM optimization was visually confirmed for the different clinical cases. Conclusions: The proposed method allows a software-based best-phase image quality improvement in coronary CT angiography. A short scan data interval at the target heart phase is sufficient, no additional scan data in other cardiac phases are required. The algorithm is therefore directly applicable to any standard cardiac CT acquisition protocol.

Rohkohl, Christopher; Bruder, Herbert; Stierstorfer, Karl [Siemens AG, Healthcare Sector, Siemensstrasse 1, 91301 Forchheim (Germany); Flohr, Thomas [Siemens AG, Healthcare Sector, Siemensstrasse 1, 91301 Forchheim (Germany); Institute of Diagnostic Radiology, Eberhard Karls University, Hoppe-Seyler-Str. 3, 72076 Tuebingen (Germany)

2013-03-15T23:59:59.000Z

313

DOE Zero Energy Ready Home Case Study, Preferred Builders, Old Greenwich, CT, Custom  

Broader source: Energy.gov [DOE]

Case study of a DOE Zero Energy Ready Home in Old Greenwich CT, that scored HERS 42 without PV or HERS 20 with PV. This 2,700 ft2 custom home has advanced framed walls with R-24 blown cellulose plus R-7.5 EPS rigid foam, membrane-coated OSB, a close-cell spray foamed attic, R-13 closed-cell spray foam under the slab and on basement walls, an ERV, and a gas boiler for forced air and radiant floor heat.

314

MRI- Versus CT-Based Volume Delineation of Lumpectomy Cavity in Supine Position in Breast-Conserving Therapy: An Exploratory Study  

SciTech Connect (OSTI)

Purpose: To examine magnetic resonance imaging (MRI) and computed tomography (CT) for lumpectomy cavity (LC) volume delineation in supine radiotherapy treatment position and to assess the interobserver variability. Methods and Materials: A total of 15 breast cancer patients underwent a planning CT and directly afterward MRI in supine radiotherapy treatment position. Then, 4 observers (2 radiation oncologists and 2 radiologists) delineated the LC on the CT and MRI scans and assessed the cavity visualization score (CVS). The CVS, LC volume, conformity index (CI), mean shift of the center of mass (COM), with the standard deviation, were quantified for both CT and MRI. Results: The CVS showed that MRI and CT provide about equal optimal visibility of the LC. If the CVS was high, magnetic resonance imaging provided more detail of the interfaces of the LC seroma with the unaffected GBT. MRI also pictured in more detail the interfaces of axillary seromas (if present) with their surroundings and their relationship to the LC. Three observers delineated smaller, and one observer larger, LC volumes comparing the MRI- and CT-derived delineations. The mean {+-} standard deviation CI was 32% {+-} 25% for MRI and 52% {+-} 21% for CT. The mean {+-} standard deviation COM shift was 11 {+-} 10 mm (range 1-36) for MRI and 4 {+-} 3 mm (range 1-10) for CT. Conclusions: MRI does not add additional information to CT in cases in which the CVS is assessed as low. The conformity (CI) is lower for MRI than for CT, especially at a low CVS owing to greater COM shifts for MRI, probably caused by inadequate visibility of the surgical clips on magnetic resonance (MR) images. The COM shifts seriously dictate a decline in the CI more than the variability of the LC volumes does. In cases in which MRI provides additional information, MRI must be combined with the CT/surgical clip data.

Giezen, Marina, E-mail: marinagiezen@zonnet.nl [Radiotherapy Center West, Medical Center Haaglanden, The Hague (Netherlands); Kouwenhoven, Erik [Radiotherapy Center West, Medical Center Haaglanden, The Hague (Netherlands); Scholten, Astrid N. [Department of Clinical Oncology, Leiden University Medical Center, Leiden (Netherlands); Coerkamp, Emile G.; Heijenbrok, Mark [Department of Radiology, Medical Center Haaglanden, The Hague (Netherlands); Jansen, Wim P.A. [Department of Clinical Oncology, Leiden University Medical Center, Leiden (Netherlands); Mast, Mirjam E.; Petoukhova, Anna L. [Radiotherapy Center West, Medical Center Haaglanden, The Hague (Netherlands); Struikmans, Henk [Radiotherapy Center West, Medical Center Haaglanden, The Hague (Netherlands); Department of Clinical Oncology, Leiden University Medical Center, Leiden (Netherlands)

2012-03-15T23:59:59.000Z

315

MRI and CT image indexing and retrieval using local mesh peak valley edge patterns  

Science Journals Connector (OSTI)

Abstract In this paper, a new pattern based feature, local mesh peak valley edge pattern (LMePVEP) is proposed for biomedical image indexing and retrieval. The standard LBP extracts the gray scale relationship between the center pixel and its surrounding neighbors in an image. Whereas the proposed method extracts the gray scale relationship among the neighbors for a given center pixel in an image. The relations among the neighbors are peak/valley edges which are obtained by performing the first-order derivative. The performance of the proposed method (LMePVEP) is tested by conducting two experiments on two benchmark biomedical databases. Further, it is mentioned that the databases used for experiments are OASIS?MRI database which is the magnetic resonance imaging (MRI) database and VIA/I–ELCAP-CT database which includes region of interest computer tomography (CT) images. The results after being investigated show a significant improvement in terms average retrieval precision (ARP) and average retrieval rate (ARR) as compared to LBP and LBP variant features.

Subrahmanyam Murala; Q.M. Jonathan Wu

2014-01-01T23:59:59.000Z

316

Comparative dosimetry of dental CBCT devices and 64-slice CT for oral and maxillofacial radiology  

Science Journals Connector (OSTI)

Objectives This study compares 2 measures of effective dose, E1990 and E2007, for 8 dentoalveolar and maxillofacial cone-beam computerized tomography (CBCT) units and a 64-slice multidetector CT (MDCT) unit. Study design Average tissue-absorbed dose, equivalent dose, and effective dose were calculated using thermoluminescent dosimeter chips in a radiation analog dosimetry phantom. Effective doses were derived using 1990 and the superseding 2007 International Commission on Radiological Protection (ICRP) recommendations. Results Large-field of view (FOV) CBCT E2007 ranged from 68 to 1,073 ?Sv. Medium-FOV CBCT E2007 ranged from 69 to 560 ?Sv, whereas a similar-FOV MDCT produced 860 ?Sv. The E2007 calculations were 23% to 224% greater than E1990. Conclusions The 2007 recommendations of the ICRP, which include salivary glands, extrathoracic region, and oral mucosa in the calculation of effective dose, result in an upward reassessment of fatal cancer risk from oral and maxillofacial radiographic examinations. Dental CBCT can be recommended as a dose-sparing technique in comparison with alternative medical CT scans for common oral and maxillofacial radiographic imaging tasks.

John B. Ludlow; Marija Ivanovic

2008-01-01T23:59:59.000Z

317

Dose calculation software for helical tomotherapy, utilizing patient CT data to calculate an independent three-dimensional dose cube  

SciTech Connect (OSTI)

Purpose: Treatment plans for the TomoTherapy unit are produced with a planning system that is integral to the unit. The authors have produced an independent dose calculation system, to enable plans to be recalculated in three dimensions, using the patient's CT data. Methods: Software has been written using MATLAB. The DICOM-RT plan object is used to determine the treatment parameters used, including the treatment sinogram. Each projection of the sinogram is segmented and used to calculate dose at multiple calculation points in a three-dimensional grid using tables of measured beam data. A fast ray-trace algorithm is used to determine effective depth for each projection angle at each calculation point. Calculations were performed on a standard desktop personal computer, with a 2.6 GHz Pentium, running Windows XP. Results: The time to perform a calculation, for 3375 points averaged 1 min 23 s for prostate plans and 3 min 40 s for head and neck plans. The mean dose within the 50% isodose was calculated and compared with the predictions of the TomoTherapy planning system. When the modified CT (which includes the TomoTherapy couch) was used, the mean difference for ten prostate patients, was -0.4% (range -0.9% to +0.3%). With the original CT (which included the CT couch), the mean difference was -1.0% (range -1.7% to 0.0%). The number of points agreeing with a gamma 3%/3 mm averaged 99.2% with the modified CT, 96.3% with the original CT. For ten head and neck patients, for the modified and original CT, respectively, the mean difference was +1.1% (range -0.4% to +3.1%) and 1.1% (range -0.4% to +3.0%) with 94.4% and 95.4% passing a gamma 4%/4 mm. The ability of the program to detect a variety of simulated errors has been tested. Conclusions: By using the patient's CT data, the independent dose calculation performs checks that are not performed by a measurement in a cylindrical phantom. This enables it to be used either as an additional check or to replace phantom measurements for some patients. The software has potential to be used in any application where one wishes to model changes to patient conditions.

Thomas, Simon J.; Eyre, Katie R.; Tudor, G. Samuel J.; Fairfoul, Jamie [Medical Physics Department, Addenbrooke's Hospital, Cambridge CB2 0QQ (United Kingdom)

2012-01-15T23:59:59.000Z

318

Verh. Zool.-Bot. Ges. sterreich 147, 2010, 9398 Value-adding application of micro-CT  

E-Print Network [OSTI]

. Keywords: Pragmites australis, knot sections, transverse sections, micro-tomography. Introduction rigid plant tissues: Phragmites australis (Cav.) Trin. Ex Steud. knot sections Gabriele OkOrn, Brian australis Cav. Trin ex Steud.), grown in natural habitats and in constructed wetlands, authors tried

Metscher, Brian

319

"2. Craig","Coal","Tri-State G & T Assn, Inc",1304 "3. Fort St Vrain","Gas","Public Service Co of Colorado",969  

U.S. Energy Information Administration (EIA) Indexed Site

Colorado" Colorado" "1. Comanche","Coal","Public Service Co of Colorado",1426 "2. Craig","Coal","Tri-State G & T Assn, Inc",1304 "3. Fort St Vrain","Gas","Public Service Co of Colorado",969 "4. Cherokee","Coal","Public Service Co of Colorado",717 "5. Rawhide","Coal","Platte River Power Authority",666 "6. Rocky Mountain Energy Center","Gas","Rocky Mountain Energy Ctr LLC",601 "7. Pawnee","Coal","Public Service Co of Colorado",505 "8. Front Range Power Project","Gas","Colorado Springs City of",462 "9. Hayden","Coal","Public Service Co of Colorado",446

320

Predicting the fidelity of JPEG2000 compressed CT images using DICOM header information  

SciTech Connect (OSTI)

Purpose: To propose multiple logistic regression (MLR) and artificial neural network (ANN) models constructed using digital imaging and communications in medicine (DICOM) header information in predicting the fidelity of Joint Photographic Experts Group (JPEG) 2000 compressed abdomen computed tomography (CT) images. Methods: Our institutional review board approved this study and waived informed patient consent. Using a JPEG2000 algorithm, 360 abdomen CT images were compressed reversibly (n = 48, as negative control) or irreversibly (n = 312) to one of different compression ratios (CRs) ranging from 4:1 to 10:1. Five radiologists independently determined whether the original and compressed images were distinguishable or indistinguishable. The 312 irreversibly compressed images were divided randomly into training (n = 156) and testing (n = 156) sets. The MLR and ANN models were constructed regarding the DICOM header information as independent variables and the pooled radiologists' responses as dependent variable. As independent variables, we selected the CR (DICOM tag number: 0028, 2112), effective tube current-time product (0018, 9332), section thickness (0018, 0050), and field of view (0018, 0090) among the DICOM tags. Using the training set, an optimal subset of independent variables was determined by backward stepwise selection in a four-fold cross-validation scheme. The MLR and ANN models were constructed with the determined independent variables using the training set. The models were then evaluated on the testing set by using receiver-operating-characteristic (ROC) analysis regarding the radiologists' pooled responses as the reference standard and by measuring Spearman rank correlation between the model prediction and the number of radiologists who rated the two images as distinguishable. Results: The CR and section thickness were determined as the optimal independent variables. The areas under the ROC curve for the MLR and ANN predictions were 0.91 (95% CI; 0.86, 0.95) and 0.92 (0.87, 0.96), respectively. The correlation coefficients of the MLR and ANN predictions with the number of radiologists who responded as distinguishable were 0.76 (0.69, 0.82, p < 0.001) and 0.78 (0.71, 0.83, p < 0.001), respectively. Conclusions: The MLR and ANN models constructed using the DICOM header information offer promise in predicting the fidelity of JPEG2000 compressed abdomen CT images.

Kim, Kil Joong; Kim, Bohyoung; Lee, Hyunna; Choi, Hosik; Jeon, Jong-June; Ahn, Jeong-Hwan; Lee, Kyoung Ho [Department of Radiation Applied Life Science, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul, 110-744 (Korea, Republic of); School of Computer Science and Engineering, Seoul National University, 599 Kwanak-Ro, Kwanak-Gu, Seoul, 151-742 (Korea, Republic of); Department of Informational Statistics, Hoseo University, 165, Sechul-ri, Baebang-myeon, Asan-si, Chungcheongnam-do, 336-795 (Korea, Republic of); Department of Statistics, Seoul National University, 599 Kwanak-Ro, Kwanak-Gu, Seoul, 151-742 (Korea, Republic of); Korean Intellectual Property Office, Government Complex-Daejeon, 139 Seonsa-ro, Seo-gu, Daejeon, 302-701 (Korea, Republic of); Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Institute of Radiation Medicine, and Seoul National University Medical Research Center, 300 Gumi-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-707 (Korea, Republic of)

2011-12-15T23:59:59.000Z

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321

A hybrid approach for rapid, accurate, and direct kilovoltage radiation dose calculations in CT voxel space  

SciTech Connect (OSTI)

Purpose: To develop and validate a fast and accurate method that uses computed tomography (CT) voxel data to estimate absorbed radiation dose at a point of interest (POI) or series of POIs from a kilovoltage (kV) imaging procedure. Methods: The authors developed an approach that computes absorbed radiation dose at a POI by numerically evaluating the linear Boltzmann transport equation (LBTE) using a combination of deterministic and Monte Carlo (MC) techniques. This hybrid approach accounts for material heterogeneity with a level of accuracy comparable to the general MC algorithms. Also, the dose at a POI is computed within seconds using the Intel Core i7 CPU 920 2.67 GHz quad core architecture, and the calculations are performed using CT voxel data, making it flexible and feasible for clinical applications. To validate the method, the authors constructed and acquired a CT scan of a heterogeneous block phantom consisting of a succession of slab densities: Tissue (1.29 cm), bone (2.42 cm), lung (4.84 cm), bone (1.37 cm), and tissue (4.84 cm). Using the hybrid transport method, the authors computed the absorbed doses at a set of points along the central axis and x direction of the phantom for an isotropic 125 kVp photon spectral point source located along the central axis 92.7 cm above the phantom surface. The accuracy of the results was compared to those computed with MCNP, which was cross-validated with EGSnrc, and served as the benchmark for validation. Results: The error in the depth dose ranged from -1.45% to +1.39% with a mean and standard deviation of -0.12% and 0.66%, respectively. The error in the x profile ranged from -1.3% to +0.9%, with standard deviations of -0.3% and 0.5%, respectively. The number of photons required to achieve these results was 1x10{sup 6}. Conclusions: The voxel-based hybrid method evaluates the LBTE rapidly and accurately to estimate the absorbed x-ray dose at any POI or series of POIs from a kV imaging procedure.

Kouznetsov, Alexei; Tambasco, Mauro [Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4 (Canada); Department of Physics and Astronomy and Department of Oncology, University of Calgary and Tom Baker Cancer Centre, 1331-29 Street NW Calgary, Alberta T2N 4N2 (Canada)

2011-03-15T23:59:59.000Z

322

A Backprojection-Filtration Algorithm for Nonstandard Spiral Cone-beam CT with an N-PI Window  

E-Print Network [OSTI]

triangulation. Then, they proposed a quasi-exact FBP reconstruction algorithm [9] using three sets of filter1 A Backprojection-Filtration Algorithm for Nonstandard Spiral Cone-beam CT with an N-PI Window in the nonstandard spiral scanning case. In this paper, we design an n-PI-window-based BPF algorithm, and report

Ye, Yangbo

323

Methods for reduced platen compression (RPC) test specimen cutting locations using micro-CT and planar radiographs  

E-Print Network [OSTI]

to complete an RPC analysis and improving the quality of the obtained results. High-resolution micro-CT scans are used to gain a better understanding of rat long bone anatomy by quantifying the location, shape, and orientation of the growth plate, primary...

Lemmon, Heber

2004-09-30T23:59:59.000Z

324

Abstract-Proton Computed Tomography (CT) has important implications for both image-guided diagnosis and radiation  

E-Print Network [OSTI]

-guided diagnosis and radiation therapy. For diagnosis, the fact that the patient dose committed by proton CT only render approximate stopping power estimates, limiting the power of proton radiation therapy radiation therapy is one of the most precise forms of image-guided cancer therapy since the sharp dose peak

California at Santa Cruz, University of

325

Model-based image reconstruction for dual-energy X-ray CT with fast KVP switching  

Science Journals Connector (OSTI)

The most recent generation of X-ray CT systems can collect dual energy (DE) sinograms by rapidly switching the X-ray tube voltage between two levels for alternate projection views. This reduces motion artifacts in DE imaging, but yields sinograms that ... Keywords: dualenergy X-ray computed tomography, model-based image reconstruction, penalized likelihood

Wonseok Huh; Jeffrey A. Fessler

2009-06-01T23:59:59.000Z

326

A resource for the assessment of lung nodule size estimation methods: database of thoracic CT scans of an anthropomorphic phantom  

Science Journals Connector (OSTI)

A number of interrelated factors can affect the precision and accuracy of lung nodule size estimation. To quantify the effect of these factors, we have been conducting phantom CT... Full-Text PDF contains links to datasets. See ISP homepage for software requirements and other information.

Gavrielides, Marios A; Kinnard, Lisa M; Myers, Kyle J; Peregoy, Jennifer; Pritchard, William F; Zeng, Rongping; Esparza, Juan; Karanian, John; Petrick, Nicholas

2010-01-01T23:59:59.000Z

327

Multi-GPU parallelization of a 3D Bayesian CT algorithm and its application on real foam reconstruction with incomplete  

E-Print Network [OSTI]

Tomography (CT) [1,2]. The limits of these methods appear when the number of projections is small, and for example, the data set are not complete due to the limited acquistion time. In this specific context is the computation time and especially for projection and backprojection steps. In this study, first we show how we

Paris-Sud XI, Université de

328

DOE Challenge Home Case Study, Preferred Builders, Old Greenwhich, CT, Custom  

Broader source: Energy.gov (indexed) [DOE]

Preferred Preferred Builders, Inc. Old Greenwich, CT BUILDING TECHNOLOGIES OFFICE DOE Challenge Home builders are in the top 1% of builders in the country meeting the extraordinary levels of excellence and quality specifi ed by the U.S. Department of Energy. Every DOE Challenge Home starts with ENERGY STAR for Homes Version 3 for an energy-effi cient home built on a solid foundation of building science research. Then, even more advanced technologies are designed in for a home that goes above and beyond current code to give you the superior quality construction, HVAC, appliances, indoor air quality, safety, durability, comfort, and solar-ready components along with ultra-low or no utility bills. This provides homeowners with a quality home that will last for generations to come.

329

DOE Challenge Home Case Study, BPC Green Builders, Custom Home, New Fairfield, CT  

Broader source: Energy.gov (indexed) [DOE]

BPC Green BPC Green Builders New Fairfi eld, CT BUILDING TECHNOLOGIES OFFICE DOE Challenge Home builders are in the top 1% of builders in the country meeting the extraordinary levels of excellence and quality specifi ed by the U.S. Department of Energy. Every DOE Challenge Home starts with ENERGY STAR for Homes Version 3 for an energy-effi cient home built on a solid foundation of building science research. Then, even more advanced technologies are designed in for a home that goes above and beyond current code to give you the superior quality construction, HVAC, appliances, indoor air quality, safety, durability, comfort, and solar-ready components along with ultra-low or no utility bills. This provides homeowners with a quality home that will last for generations to come.

330

Dynamic Multiscale Boundary Conditions for 4D CT Images of Healthy and Emphysematous Rat  

SciTech Connect (OSTI)

Changes in the shape of the lung during breathing determine the movement of airways and alveoli, and thus impact airflow dynamics. Modeling airflow dynamics in health and disease is a key goal for predictive multiscale models of respiration. Past efforts to model changes in lung shape during breathing have measured shape at multiple breath-holds. However, breath-holds do not capture hysteretic differences between inspiration and expiration resulting from the additional energy required for inspiration. Alternatively, imaging dynamically – without breath-holds – allows measurement of hysteretic differences. In this study, we acquire multiple micro-CT images per breath (4DCT) in live rats, and from these images we develop, for the first time, dynamic volume maps. These maps show changes in local volume across the entire lung throughout the breathing cycle and accurately predict the global pressure-volume (PV) hysteresis.

Jacob, Rick E.; Carson, James P.; Thomas, Mathew; Einstein, Daniel R.

2013-06-14T23:59:59.000Z

331

Simulation of Cone Beam CT System Based on Monte Carlo Method  

E-Print Network [OSTI]

Adaptive Radiation Therapy (ART) was developed based on Image-guided Radiation Therapy (IGRT) and it is the trend of photon radiation therapy. To get a better use of Cone Beam CT (CBCT) images for ART, the CBCT system model was established based on Monte Carlo program and validated against the measurement. The BEAMnrc program was adopted to the KV x-ray tube. Both IOURCE-13 and ISOURCE-24 were chosen to simulate the path of beam particles. The measured Percentage Depth Dose (PDD) and lateral dose profiles under 1cm water were compared with the dose calculated by DOSXYZnrc program. The calculated PDD was better than 1% within the depth of 10cm. More than 85% points of calculated lateral dose profiles was within 2%. The correct CBCT system model helps to improve CBCT image quality for dose verification in ART and assess the CBCT image concomitant dose risk.

Wang, Yu; Cao, Ruifen; Hu, Liqin; Li, Bingbing

2014-01-01T23:59:59.000Z

332

Fast Scatter Artifacts Correction for Cone-Beam CT without System Modification and Repeat Scan  

E-Print Network [OSTI]

We provide a fast and accurate scatter artifacts correction algorithm for cone beam CT (CBCT) imaging. The method starts with an estimation of coarse scatter profile for a set of CBCT images. A total-variation denoising algorithm designed specifically for Poisson signal is then applied to derive the final scatter distribution. Qualitatively and quantitatively evaluations using Monte Carlo (MC) simulations, experimental CBCT phantom data, and \\emph{in vivo} human data acquired for a clinical image guided radiation therapy were performed. Results show that the proposed algorithm can significantly reduce scatter artifacts and recover the correct HU within either projection domain or image domain. Further test shows the method is robust with respect to segmentation procedure.

Zhao, Wei; Wang, Luyao

2015-01-01T23:59:59.000Z

333

Contouring Variability of the Penile Bulb on CT Images: Quantitative Assessment Using a Generalized Concordance Index  

SciTech Connect (OSTI)

Purpose: Within a multicenter study (DUE-01) focused on the search of predictors of erectile dysfunction and urinary toxicity after radiotherapy for prostate cancer, a dummy run exercise on penile bulb (PB) contouring on computed tomography (CT) images was carried out. The aim of this study was to quantitatively assess interobserver contouring variability by the application of the generalized DICE index. Methods and Materials: Fifteen physicians from different Institutes drew the PB on CT images of 10 patients. The spread of DICE values was used to objectively select those observers who significantly disagreed with the others. The analyses were performed with a dedicated module in the VODCA software package. Results: DICE values were found to significantly change among observers and patients. The mean DICE value was 0.67, ranging between 0.43 and 0.80. The statistics of DICE coefficients identified 4 of 15 observers who systematically showed a value below the average (p value range, 0.013 - 0.059): Mean DICE values were 0.62 for the 4 'bad' observers compared to 0.69 of the 11 'good' observers. For all bad observers, the main cause of the disagreement was identified. Average DICE values were significantly worse from the average in 2 of 10 patients (0.60 vs. 0.70, p < 0.05) because of the limited visibility of the PB. Excluding the bad observers and the 'bad' patients,' the mean DICE value increased from 0.67 to 0.70; interobserver variability, expressed in terms of standard deviation of DICE spread, was also reduced. Conclusions: The obtained values of DICE around 0.7 shows an acceptable agreement, considered the small dimension of the PB. Additional strategies to improve this agreement are under consideration and include an additional tutorial of the so-called bad observers with a recontouring procedure, or the recontouring by a single observer of the PB for all patients included in the DUE-01 study.

Carillo, Viviana [Department of Medical Physics, San Raffaele Scientific Institute, Milano (Italy)] [Department of Medical Physics, San Raffaele Scientific Institute, Milano (Italy); Cozzarini, Cesare [Department of Radiotherapy, San Raffaele Scientific Institute, Milano (Italy)] [Department of Radiotherapy, San Raffaele Scientific Institute, Milano (Italy); Perna, Lucia; Calandra, Mauro [Department of Medical Physics, San Raffaele Scientific Institute, Milano (Italy)] [Department of Medical Physics, San Raffaele Scientific Institute, Milano (Italy); Gianolini, Stefano [Medical Software Solutions GmbH, Hagendorn (Switzerland)] [Medical Software Solutions GmbH, Hagendorn (Switzerland); Rancati, Tiziana [Prostate Cancer Program, IRCCS National Institute of Cancer, Milano (Italy)] [Prostate Cancer Program, IRCCS National Institute of Cancer, Milano (Italy); Spinelli, Antonello Enrico [Department of Medical Physics, San Raffaele Scientific Institute, Milano (Italy)] [Department of Medical Physics, San Raffaele Scientific Institute, Milano (Italy); Vavassori, Vittorio [Department of Radiotherapy, Cliniche Gavazzeni Humanitas, Bergamo (Italy)] [Department of Radiotherapy, Cliniche Gavazzeni Humanitas, Bergamo (Italy); Villa, Sergio [Department of Radiotherapy 1, IRCCS National Institute of Cancer, Milano (Italy)] [Department of Radiotherapy 1, IRCCS National Institute of Cancer, Milano (Italy); Valdagni, Riccardo [Prostate Cancer Program, IRCCS National Institute of Cancer, Milano (Italy) [Prostate Cancer Program, IRCCS National Institute of Cancer, Milano (Italy); Department of Radiotherapy 1, IRCCS National Institute of Cancer, Milano (Italy); Fiorino, Claudio, E-mail: fiorino.claudio@hsr.it [Department of Medical Physics, San Raffaele Scientific Institute, Milano (Italy)] [Department of Medical Physics, San Raffaele Scientific Institute, Milano (Italy)

2012-11-01T23:59:59.000Z

334

Statistical CT noise reduction with multiscale decomposition and penalized weighted least squares in the projection domain  

SciTech Connect (OSTI)

Purposes: The suppression of noise in x-ray computed tomography (CT) imaging is of clinical relevance for diagnostic image quality and the potential for radiation dose saving. Toward this purpose, statistical noise reduction methods in either the image or projection domain have been proposed, which employ a multiscale decomposition to enhance the performance of noise suppression while maintaining image sharpness. Recognizing the advantages of noise suppression in the projection domain, the authors propose a projection domain multiscale penalized weighted least squares (PWLS) method, in which the angular sampling rate is explicitly taken into consideration to account for the possible variation of interview sampling rate in advanced clinical or preclinical applications. Methods: The projection domain multiscale PWLS method is derived by converting an isotropic diffusion partial differential equation in the image domain into the projection domain, wherein a multiscale decomposition is carried out. With adoption of the Markov random field or soft thresholding objective function, the projection domain multiscale PWLS method deals with noise at each scale. To compensate for the degradation in image sharpness caused by the projection domain multiscale PWLS method, an edge enhancement is carried out following the noise reduction. The performance of the proposed method is experimentally evaluated and verified using the projection data simulated by computer and acquired by a CT scanner. Results: The preliminary results show that the proposed projection domain multiscale PWLS method outperforms the projection domain single-scale PWLS method and the image domain multiscale anisotropic diffusion method in noise reduction. In addition, the proposed method can preserve image sharpness very well while the occurrence of 'salt-and-pepper' noise and mosaic artifacts can be avoided. Conclusions: Since the interview sampling rate is taken into account in the projection domain multiscale decomposition, the proposed method is anticipated to be useful in advanced clinical and preclinical applications where the interview sampling rate varies.

Tang Shaojie; Tang Xiangyang [Imaging and Medical Physics, Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1701 Uppergate Dr., C-5018, Atlanta, Georgia 30322 (United States); School of Automation, Xi'an University of Posts and Telecommunications, Xi'an, Shaanxi 710121 (China); Imaging and Medical Physics, Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1701 Uppergate Dr., C-5018, Atlanta, Georgia 30322 (United States)

2012-09-15T23:59:59.000Z

335

Best fit refractive index of matching liquid for 3D NIPAM gel dosimeters using optical CT  

Science Journals Connector (OSTI)

Abstract The accuracy of an optical computed tomography (CT)-based dosimeter is significantly affected by the refractive index (RI) of the matching liquid. Mismatched RI induces reflection and refraction as the laser beam passes through the gel phantom. Moreover, the unwanted light rays collected by the photodetector produce image artifacts after image reconstruction from the collected data. To obtain the best image quality, this study investigates the best-fit RI of the matching liquid for a 3D NIPAM gel dosimeter. The three recipes of NIPAM polymer gel used in this study consisted of 5% gelatin, 5% NIPAM and 3% N,N'-methylene bisacrylamide, which were combined with three compositions (5, 10, and 20 mM) of Tetrakis (hydroxymethyl) phosphonium chloride. Results were evaluated using a quantitative evaluation method of the gamma evaluation technique. Results showed that the best-fit RI for the non-irradiated NIPAM gel ranges from 1.340 to 1.346 for various NIPAM recipes with sensitivities ranging from 0.0113 to 0.0227. The greatest pass rate of 88.00% is achieved using best-fit RI=1.346 of the matching liquid. The adoption of mismatching RI decreases the gamma pass rate by 2.63% to 16.75% for all three recipes of NIPAM gel dosimeters. In addition, the maximum average deviation is less than 0.1% for the red and transparent matching liquids. Thus, the color of the matching liquid does not affect the measurement accuracy of the NIPAM gel dosimeter, as measured by optical CT.

Chin-Hsing Chen; Jay Wu; Bor-Tsung Hsieh; De-Shiou Chen; Tzu-Hwei Wang; Sou-Hsin Chien; Yuan-Jen Chang

2014-01-01T23:59:59.000Z

336

Supercritical CO2 core flooding and imbibition in Berea sandstone — CT imaging and numerical simulation  

Science Journals Connector (OSTI)

This paper reports a numerical simulation study of a full CO2 core flooding and imbibition cycle on a Berea sandstone core (measured 14.45 cm long and 3.67 cm in diameter). During the test, supercritical CO2 (at 10 MPa and 40 °C) and CO2-saturated brine was injected into one end of the horizontal core and a X-ray CT scanner (with a resolution of 0.35 mm × 0.35 mm) was employed to monitor and record changes in the fluid saturations, which enabled 3D mapping of the saturation profiles throughout the core during the course of core flooding test. From the digital CT saturation data, mean saturation profiles along the core length were plotted with time. A 1D model of the core was constructed to simulate the core flooding test and attempt was made to history match core test results, particularly the evolution of the mean CO2 saturation profiles during CO2 injection. Curve-fitting of the centrifugal air-water capillary pressure data (drainage) for the Berea core showed that the core test data could be adequately described by the Van Genuchten equation. The matched set of parameters ( S l r , P 0 , m ) were 0.09, 20 KPa, 0.425 respectively. In the absence of the relative permeability for the Berea core, it was decided to use the parameters obtained from matching the air-water capillary pressure data as a first approximation for the CO2-brine system in the model.

Ji-Quan Shi; Ziqiu Xue; Sevket Durucan

2011-01-01T23:59:59.000Z

337

Reducing metal artifacts in cone-beam CT images by preprocessing projection data  

SciTech Connect (OSTI)

Purpose: Computed tomography (CT) streak artifacts caused by metallic implants remain a challenge for the automatic processing of image data. The impact of metal artifacts in the soft-tissue region is magnified in cone-beam CT (CBCT), because the soft-tissue contrast is usually lower in CBCT images. The goal of this study was to develop an effective offline processing technique to minimize the effect. Methods and Materials: The geometry calibration cue of the CBCT system was used to track the position of the metal object in projection views. The three-dimensional (3D) representation of the object can be established from only two user-selected viewing angles. The position of the shadowed region in other views can be tracked by projecting the 3D coordinates of the object. Automatic image segmentation was used followed by a Laplacian diffusion method to replace the pixels inside the metal object with the boundary pixels. The modified projection data were then used to reconstruct a new CBCT image. The procedure was tested in phantoms, prostate cancer patients with implanted gold markers and metal prosthesis, and a head-and-neck patient with dental amalgam in the teeth. Results: Both phantom and patient studies demonstrated that the procedure was able to minimize the metal artifacts. Soft-tissue visibility was improved near or away from the metal object. The processing time was 1-2 s per projection. Conclusion: We have implemented an effective metal artifact-suppressing algorithm to improve the quality of CBCT images.

Zhang Yongbin [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Zhang Lifei [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Zhu, X. Ronald [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Lee, Andrew K. [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Chambers, Mark [Department of Dental Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States); Dong Lei [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, TX (United States)]. E-mail: ldong@mdanderson.org

2007-03-01T23:59:59.000Z

338

Automatic tracking of implanted fiducial markers in cone beam CT projection images  

SciTech Connect (OSTI)

Purpose: This paper describes a novel method for simultaneous intrafraction tracking of multiple fiducial markers. Although the proposed method is generic and can be adopted for a number of applications including fluoroscopy based patient position monitoring and gated radiotherapy, the tracking results presented in this paper are specific to tracking fiducial markers in a sequence of cone beam CT projection images. Methods: The proposed method is accurate and robust thanks to utilizing the mean shift and random sampling principles, respectively. The performance of the proposed method was evaluated with qualitative and quantitative methods, using data from two pancreatic and one prostate cancer patients and a moving phantom. The ground truth, for quantitative evaluation, was calculated based on manual tracking preformed by three observers. Results: The average dispersion of marker position error calculated from the tracking results for pancreas data (six markers tracked over 640 frames, 3840 marker identifications) was 0.25 mm (at iscoenter), compared with an average dispersion for the manual ground truth estimated at 0.22 mm. For prostate data (three markers tracked over 366 frames, 1098 marker identifications), the average error was 0.34 mm. The estimated tracking error in the pancreas data was < 1 mm (2 pixels) in 97.6% of cases where nearby image clutter was detected and in 100.0% of cases with no nearby image clutter. Conclusions: The proposed method has accuracy comparable to that of manual tracking and, in combination with the proposed batch postprocessing, superior robustness. Marker tracking in cone beam CT (CBCT) projections is useful for a variety of purposes, such as providing data for assessment of intrafraction motion, target tracking during rotational treatment delivery, motion correction of CBCT, and phase sorting for 4D CBCT.

Marchant, T. E.; Skalski, A.; Matuszewski, B. J. [Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester M20 4BX, United Kingdom and Manchester Academic Health Science Centre, University of Manchester, Manchester M20 4BX (United Kingdom); AGH University of Science and Technology, al. A. Mickiewicza 30, Krakow 30-059 (Poland); School of Computing, Engineering and Physical Sciences, University of Central Lancashire, Preston PR1 2HE (United Kingdom)

2012-03-15T23:59:59.000Z

339

Patient radiation dose in prospectively gated axial CT coronary angiography and retrospectively gated helical technique with a 320-detector row CT scanner  

SciTech Connect (OSTI)

Purpose: The aim of this study was to evaluate radiation dose to patients undergoing computed tomography coronary angiography (CTCA) for prospectively gated axial (PGA) technique and retrospectively gated helical (RGH) technique. Methods: Radiation doses were measured for a 320-detector row CT scanner (Toshiba Aquilion ONE) using small sized silicon-photodiode dosimeters, which were implanted at various tissue and organ positions within an anthropomorphic phantom for a standard Japanese adult male. Output signals from photodiode dosimeters were read out on a personal computer, from which organ and effective doses were computed according to guidelines published in the International Commission on Radiological Protection Publication 103. Results: Organs that received high doses were breast, followed by lung, esophagus, and liver. Breast doses obtained with PGA technique and a phase window width of 16% at a simulated heart rate of 60 beats per minute were 13 mGy compared to 53 mGy with RGH technique using electrocardiographically dependent dose modulation at the same phase window width as that in PGA technique. Effective doses obtained in this case were 4.7 and 20 mSv for the PGA and RGH techniques, respectively. Conversion factors of dose length product to the effective dose in PGA and RGH were 0.022 and 0.025 mSv mGy{sup -1} cm{sup -1} with a scan length of 140 mm. Conclusions: CTCA performed with PGA technique provided a substantial effective dose reduction, i.e., 70%-76%, compared to RGH technique using the dose modulation at the same phase windows as those in PGA technique. Though radiation doses in CTCA with RGH technique were the same level as, or some higher than, those in conventional coronary angiography (CCA), the use of PGA technique reduced organ and effective doses to levels less than CCA except for breast dose.

Seguchi, Shigenobu; Aoyama, Takahiko; Koyama, Shuji; Fujii, Keisuke; Yamauchi-Kawaura, Chiyo [Graduate School of Medicine, Nagoya University, Daikominami, Higashi-ku, Nagoya 461-8673 (Japan) and Department of Medical Technology, Nagoya Daini Red Cross Hospital, Myouken-chou, Showa-ku, Nagoya 466-8650 (Japan); Graduate School of Medicine, Nagoya University, Daikominami, Higashi-ku, Nagoya 461-8673 (Japan); Section of Radiological Protection, National Institute of Radiological Sciences, Anagawa, Inage-ku, Chiba 263-8555 (Japan); Graduate School of Medicine, Nagoya University, Daikominami, Higashi-ku, Nagoya 461-8673 (Japan)

2010-11-15T23:59:59.000Z

340

Inter-slice bidirectional registration-based segmentation of the prostate gland in MR and CT image sequences  

SciTech Connect (OSTI)

Purpose: Accurate segmentation and volume estimation of the prostate gland in magnetic resonance (MR) and computed tomography (CT) images are necessary steps in diagnosis, treatment, and monitoring of prostate cancer. This paper presents an algorithm for the prostate gland volume estimation based on the semiautomated segmentation of individual slices in T2-weighted MR and CT image sequences. Methods: The proposedInter-Slice Bidirectional Registration-based Segmentation (iBRS) algorithm relies on interslice image registration of volume data to segment the prostate gland without the use of an anatomical atlas. It requires the user to mark only three slices in a given volume dataset, i.e., the first, middle, and last slices. Next, the proposed algorithm uses a registration algorithm to autosegment the remaining slices. We conducted comprehensive experiments to measure the performance of the proposed algorithm using three registration methods (i.e., rigid, affine, and nonrigid techniques). Results: The results with the proposed technique were compared with manual marking using prostate MR and CT images from 117 patients. Manual marking was performed by an expert user for all 117 patients. The median accuracies for individual slices measured using the Dice similarity coefficient (DSC) were 92% and 91% for MR and CT images, respectively. The iBRS algorithm was also evaluated regarding user variability, which confirmed that the algorithm was robust to interuser variability when marking the prostate gland. Conclusions: The proposed algorithm exploits the interslice data redundancy of the images in a volume dataset of MR and CT images and eliminates the need for an atlas, minimizing the computational cost while producing highly accurate results which are robust to interuser variability.

Khalvati, Farzad, E-mail: farzad.khalvati@uwaterloo.ca; Tizhoosh, Hamid R. [Department of Systems Design Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada)] [Department of Systems Design Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); Salmanpour, Aryan; Rahnamayan, Shahryar [Department of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Ontario L1H 7K4 (Canada)] [Department of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Ontario L1H 7K4 (Canada); Rodrigues, George [Department of Radiation Oncology, London Regional Cancer Program, London, Ontario N6C 2R6, Canada and Department of Epidemiology/Biostatistics, University of Western Ontario, London, Ontario N6A 3K7 (Canada)] [Department of Radiation Oncology, London Regional Cancer Program, London, Ontario N6C 2R6, Canada and Department of Epidemiology/Biostatistics, University of Western Ontario, London, Ontario N6A 3K7 (Canada)

2013-12-15T23:59:59.000Z

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341

Experimental evaluation of actual delivered dose using mega-voltage cone-beam CT and direct point dose measurement  

SciTech Connect (OSTI)

Radiation therapy in patients is planned by using computed tomography (CT) images acquired before start of the treatment course. Here, tumor shrinkage or weight loss or both, which are common during the treatment course for patients with head-and-neck (H and N) cancer, causes unexpected differences from the plan, as well as dose uncertainty with the daily positional error of patients. For accurate clinical evaluation, it is essential to identify these anatomical changes and daily positional errors, as well as consequent dosimetric changes. To evaluate the actual delivered dose, the authors proposed direct dose measurement and dose calculation with mega-voltage cone-beam CT (MVCBCT). The purpose of the present study was to experimentally evaluate dose calculation by MVCBCT. Furthermore, actual delivered dose was evaluated directly with accurate phantom setup. Because MVCBCT has CT-number variation, even when the analyzed object has a uniform density, a specific and simple CT-number correction method was developed and applied for the H and N site of a RANDO phantom. Dose distributions were calculated with the corrected MVCBCT images of a cylindrical polymethyl methacrylate phantom. Treatment processes from planning to beam delivery were performed for the H and N site of the RANDO phantom. The image-guided radiation therapy procedure was utilized for the phantom setup to improve measurement reliability. The calculated dose in the RANDO phantom was compared to the measured dose obtained by metal-oxide-semiconductor field-effect transistor detectors. In the polymethyl methacrylate phantom, the calculated and measured doses agreed within about +3%. In the RANDO phantom, the dose difference was less than +5%. The calculated dose based on simulation-CT agreed with the measured dose within±3%, even in the region with a high dose gradient. The actual delivered dose was successfully determined by dose calculation with MVCBCT, and the point dose measurement with the image-guided radiation therapy procedure.

Matsubara, Kana, E-mail: matsubara-kana@hs.tmu.ac.jp [Graduate School of Human Health Sciences, Tokyo Metropolitan University, Arakawa-ku Tokyo (Japan); Kohno, Ryosuke [National Cancer Center Hospital East, Chiba (Japan); National Cancer Center Research Institute, Chiba (Japan); Nishioka, Shie; Shibuya, Toshiyuki; Ariji, Takaki; Akimoto, Tetsuo [National Cancer Center Hospital East, Chiba (Japan); Saitoh, Hidetoshi [Graduate School of Human Health Sciences, Tokyo Metropolitan University, Arakawa-ku Tokyo (Japan)

2013-07-01T23:59:59.000Z

342

Potential of dual-energy subtraction for converting CT numbers to electron density based on a single linear relationship  

SciTech Connect (OSTI)

Purpose: The conversion of the computed tomography (CT) number to electron density is one of the main processes that determine the accuracy of patient dose calculations in radiotherapy treatment planning. However, the CT number and electron density of tissues cannot be generally interrelated via a simple one-to-one correspondence because the CT number depends on the effective atomic number as well as the electron density. The purpose of this study is to present a simple conversion from the energy-subtracted CT number ({Delta}HU) by means of dual-energy CT (DECT) to the relative electron density ({rho}{sub e}) via a single linear relationship. Methods: The {Delta}HU-{rho}{sub e} conversion method was demonstrated by performing analytical DECT image simulations that were intended to imitate a second-generation dual-source CT (DSCT) scanner with an additional tin filtration for the high-kV tube. The {Delta}HU-{rho}{sub e} calibration line was obtained from the image simulation with a 33 cm-diameter electron density calibration phantom equipped with 16 inserts including polytetrafluoroethylene, polyvinyl chloride, and aluminum; the elemental compositions of these three inserts were quite different to those of body tissues. The {Delta}HU-{rho}{sub e} conversion method was also applied to previously published experimental CT data, which were measured using two different CT scanners, to validate the clinical feasibility of the present approach. In addition, the effect of object size on {rho}{sub e}-calibrated images was investigated by image simulations using a 25 cm-diameter virtual phantom for two different filtrations: with and without the tin filter for the high-kV tube. Results: The simulated {Delta}HU-{rho}{sub e} plot exhibited a predictable linear relationship over a wide range of {rho}{sub e} from 0.00 (air) to 2.35 (aluminum). Resultant values of the coefficient of determination, slope, and intercept of the linear function fitted to the data were close to those of the ideal case. The maximum difference between the ideal and simulated {rho}{sub e} values was -0.7%. The satisfactory linearity of {Delta}HU-{rho}{sub e} was also confirmed from analyses of the experimental CT data. In the experimental cases, the maximum difference between the nominal and simulated {rho}{sub e} values was found to be 2.5% after two outliers were excluded. When compared with the case without the tin filter, the {Delta}HU-{rho}{sub e} conversion performed with the tin filter yielded a lower dose and more reliable {rho}{sub e} values that were less affected by the object-size variation. Conclusions: The {Delta}HU-{rho}{sub e} calibration line with a simple one-to-one correspondence would facilitate the construction of a well-calibrated {rho}{sub e} image from acquired dual-kV images, and currently, second generation DSCT may be a feasible modality for the clinical use of the {Delta}HU-{rho}{sub e} conversion method.

Saito, Masatoshi [Department of Radiological Technology, School of Health Sciences, Faculty of Medicine, Niigata University, Niigata 951-8518 (Japan)

2012-04-15T23:59:59.000Z

343

A One-Step Cone-Beam CT-Enabled Planning-to-Treatment Model for Palliative Radiotherapy-From Development to Implementation  

SciTech Connect (OSTI)

Purpose: To develop a cone-beam computed tomography (CT)-enabled one-step simulation-to-treatment process for the treatment of bone metastases. Methods and Materials: A three-phase prospective study was conducted. Patients requiring palliative radiotherapy to the spine, mediastinum, or abdomen/pelvis suitable for treatment with simple beam geometry ({<=}2 beams) were accrued. Phase A established the accuracy of cone-beam CT images for the purpose of gross tumor target volume (GTV) definition. Phase B evaluated the feasibility of implementing the cone-beam CT-enabled planning process at the treatment unit. Phase C evaluated the online cone-beam CT-enabled process for the planning and treatment of patients requiring radiotherapy for bone metastases. Results: Eighty-four patients participated in this study. Phase A (n = 9) established the adequacy of cone-beam CT images for target definition. Phase B (n = 45) established the quality of treatment plans to be adequate for clinical implementation for bone metastases. When the process was applied clinically in bone metastases (Phase C), the degree of overlap between planning computed tomography (PCT) and cone-beam CT for GTV and between PCT and cone-beam CT for treatment field was 82% {+-} 11% and 97% {+-} 4%, respectively. The oncologist's decision to accept the plan under a time-pressured environment remained of high quality, with the cone-beam CT-generated treatment plan delivering at least 90% of the prescribed dose to 100% {+-} 0% of the cone-beam CT planning target volume (PTV). With the assumption that the PCT PTV is the gold-standard target, the cone-beam CT-generated treatment plan delivered at least 90% and at least 95% of dose to 98% {+-} 2% and 97% {+-} 5% of the PCT PTV, respectively. The mean time for the online planning and treatment process was 32.7 {+-} 4.0 minutes. Patient satisfaction was high, with a trend for superior satisfaction with the cone-beam CT-enabled process. Conclusions: The cone-beam CT-enabled palliative treatment process is feasible and is ready for clinical implementation for the treatment of bone metastases using simple beam geometry, providing a streamlined one-step process toward palliative radiotherapy.

Wong, Rebecca K.S., E-mail: rebecca.wong@rmp.uhn.on.ca [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada); Department of Radiation Oncology, University of Toronto, Toronto, Ontario (Canada); Letourneau, Daniel; Varma, Anita [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada) [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada); Department of Radiation Oncology, University of Toronto, Toronto, Ontario (Canada); Bissonnette, Jean Pierre; Fitzpatrick, David; Grabarz, Daniel; Elder, Christine [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada)] [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada); Martin, Melanie; Bezjak, Andrea [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada) [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada); Department of Radiation Oncology, University of Toronto, Toronto, Ontario (Canada); Panzarella, Tony [Department of Biostatistics, Princess Margaret Hospital, Toronto, Ontario (Canada)] [Department of Biostatistics, Princess Margaret Hospital, Toronto, Ontario (Canada); Gospodarowicz, Mary [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada) [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada); Department of Radiation Oncology, University of Toronto, Toronto, Ontario (Canada); Jaffray, David A. [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada) [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario (Canada); Department of Radiation Oncology, University of Toronto, Toronto, Ontario (Canada); Department of Medical Biophysics, University of Toronto, Toronto, Ontario (Canada)

2012-11-01T23:59:59.000Z

344

Effects of ray profile modeling on resolution recovery in clinical CT  

SciTech Connect (OSTI)

Purpose: Iterative image reconstruction gains more and more interest in clinical routine, as it promises to reduce image noise (and thereby patient dose), to reduce artifacts, or to improve spatial resolution. However, among vendors and researchers, there is no consensus of how to best achieve these goals. The authors are focusing on the aspect of geometric ray profile modeling, which is realized by some algorithms, while others model the ray as a straight line. The authors incorporate ray-modeling (RM) in nonregularized iterative reconstruction. That means, instead of using one simple single needle beam to represent the x-ray, the authors evaluate the double integral of attenuation path length over the finite source distribution and the finite detector element size in the numerical forward projection. Our investigations aim at analyzing the resolution recovery (RR) effects of RM. Resolution recovery means that frequencies can be recovered beyond the resolution limit of the imaging system. In order to evaluate, whether clinical CT images can benefit from modeling the geometrical properties of each x-ray, the authors performed a 2D simulation study of a clinical CT fan-beam geometry that includes the precise modeling of these geometrical properties. Methods: All simulations and reconstructions are performed in native fan-beam geometry. A water phantom with resolution bar patterns and a Forbild thorax phantom with circular resolution patterns representing calcifications in the heart region are simulated. An FBP reconstruction with a Ram–Lak kernel is used as a reference reconstruction. The FBP is compared to iterative reconstruction techniques with and without RM: An ordered subsets convex (OSC) algorithm without any RM (OSC), an OSC where the forward projection is modeled concerning the finite focal spot and detector size (OSC-RM) and an OSC with RM and with a matched forward and backprojection pair (OSC-T-RM, T for transpose). In all cases, noise was matched to be able to focus on comparing spatial resolution. The authors use two different simulation settings. Both are based on the geometry of a typical clinical CT system (0.7 mm detector element size at isocenter, 1024 projections per rotation). Setting one has an exaggerated source width of 5.0 mm. Setting two has a realistically small source width of 0.5 mm. The authors also investigate the transition from setting one to two. To quantify image quality, the authors analyze line profiles through the resolution patterns to define a contrast factor (CF) for contrast-resolution plots, and the authors compare the normalized cross-correlation (NCC) with respect to the ground truth of the circular resolution patterns. To independently analyze whether RM is of advantage, the authors implemented several iterative reconstruction algorithms: The statistical iterative reconstruction algorithm OSC, the ordered subsets simultaneous algebraic reconstruction technique (OSSART) and another statistical iterative reconstruction algorithm, denoted with ordered subsets maximum likelihood (OSML) algorithm. All algorithms were implemented both without RM (denoted as OSC, OSSART, and OSML) and with RM (denoted as OSC-RM, OSSART-RM, and OSML-RM). Results: For the unrealistic case of a 5.0 mm focal spot the CF can be improved by a factor of two due to RM: the 4.2 LP/cm bar pattern, which is the first bar pattern that cannot be resolved without RM, can be easily resolved with RM. For the realistic case of a 0.5 mm focus, all results show approximately the same CF. The NCC shows no significant dependency on RM when the source width is smaller than 2.0 mm (as in clinical CT). From 2.0 mm to 5.0 mm focal spot size increasing improvements can be observed with RM. Conclusions: Geometric RM in iterative reconstruction helps improving spatial resolution, if the ray cross-section is significantly larger than the ray sampling distance. In clinical CT, however, the ray is not much thicker than the distance between neighboring ray centers, as the focal spot size is small and detector crosstalk is negligi

Hofmann, Christian [Institute of Medical Physics, Friedrich–Alexander University (FAU), Erlangen, Bavaria 91052 (Germany)] [Institute of Medical Physics, Friedrich–Alexander University (FAU), Erlangen, Bavaria 91052 (Germany); Knaup, Michael [Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg 69120 (Germany)] [Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg 69120 (Germany); Kachelrieß, Marc, E-mail: marc.kachelriess@dkfz-heidelberg.de [Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg 69120, Germany and Institute of Medical Physics, Friedrich–Alexander University (FAU), Erlangen, Bavaria 91052 (Germany)] [Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg 69120, Germany and Institute of Medical Physics, Friedrich–Alexander University (FAU), Erlangen, Bavaria 91052 (Germany)

2014-02-15T23:59:59.000Z

345

Three-dimensional anisotropic adaptive filtering of projection data for noise reduction in cone beam CT  

SciTech Connect (OSTI)

Purpose: The combination of quickly rotating C-arm gantry with digital flat panel has enabled the acquisition of three-dimensional data (3D) in the interventional suite. However, image quality is still somewhat limited since the hardware has not been optimized for CT imaging. Adaptive anisotropic filtering has the ability to improve image quality by reducing the noise level and therewith the radiation dose without introducing noticeable blurring. By applying the filtering prior to 3D reconstruction, noise-induced streak artifacts are reduced as compared to processing in the image domain. Methods: 3D anisotropic adaptive filtering was used to process an ensemble of 2D x-ray views acquired along a circular trajectory around an object. After arranging the input data into a 3D space (2D projections + angle), the orientation of structures was estimated using a set of differently oriented filters. The resulting tensor representation of local orientation was utilized to control the anisotropic filtering. Low-pass filtering is applied only along structures to maintain high spatial frequency components perpendicular to these. The evaluation of the proposed algorithm includes numerical simulations, phantom experiments, and in-vivo data which were acquired using an AXIOM Artis dTA C-arm system (Siemens AG, Healthcare Sector, Forchheim, Germany). Spatial resolution and noise levels were compared with and without adaptive filtering. A human observer study was carried out to evaluate low-contrast detectability. Results: The adaptive anisotropic filtering algorithm was found to significantly improve low-contrast detectability by reducing the noise level by half (reduction of the standard deviation in certain areas from 74 to 30 HU). Virtually no degradation of high contrast spatial resolution was observed in the modulation transfer function (MTF) analysis. Although the algorithm is computationally intensive, hardware acceleration using Nvidia's CUDA Interface provided an 8.9-fold speed-up of the processing (from 1336 to 150 s). Conclusions: Adaptive anisotropic filtering has the potential to substantially improve image quality and/or reduce the radiation dose required for obtaining 3D image data using cone beam CT.

Maier, Andreas; Wigstroem, Lars; Hofmann, Hannes G.; Hornegger, Joachim; Zhu Lei; Strobel, Norbert; Fahrig, Rebecca [Department of Radiology, Stanford University, Stanford, California 94305 (United States); Department of Radiology, Stanford University, Stanford, California 94305 (United States) and Center for Medical Image Science and Visualization, Linkoeping University, Linkoeping (Sweden); Pattern Recognition Laboratory, Department of Computer Science, Friedrich-Alexander University of Erlangen-Nuremberg, 91054, Erlangen (Germany); Nuclear and Radiological Engineering and Medical Physics Programs, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Siemens AG Healthcare, Forchheim 91301 (Germany); Department of Radiology, Stanford University, Stanford, California 94305 (United States)

2011-11-15T23:59:59.000Z

346

Methane hydrate distribution from prolonged and repeated formation in natural and compacted sand samples: X-ray CT observations  

SciTech Connect (OSTI)

To study physical properties of methane gas hydrate-bearing sediments, it is necessary to synthesize laboratory samples due to the limited availability of cores from natural deposits. X-ray computed tomography (CT) and other observations have shown gas hydrate to occur in a number of morphologies over a variety of sediment types. To aid in understanding formation and growth patterns of hydrate in sediments, methane hydrate was repeatedly formed in laboratory-packed sand samples and in a natural sediment core from the Mount Elbert Stratigraphic Test Well. CT scanning was performed during hydrate formation and decomposition steps, and periodically while the hydrate samples remained under stable conditions for up to 60 days. The investigation revealed the impact of water saturation on location and morphology of hydrate in both laboratory and natural sediments during repeated hydrate formations. Significant redistribution of hydrate and water in the samples was observed over both the short and long term.

Rees, E.V.L.; Kneafsey, T.J.; Seol, Y.

2010-07-01T23:59:59.000Z

347

Fusion of Immunoscintigraphy Single Photon Emission Computed Tomography (SPECT) with CT of the Chest in Patients with Non-Small Cell Lung Cancer  

Science Journals Connector (OSTI)

...the eighth patient, fusion demonstrated the absence...image registration or fusion of oefunctional studies...were acquired with dual energy windows to provide anatomic and landmark...the other. The 5761s FUSION OF CHEST SPECT AND CT...

Sanjeev Katyal; Elissa Lipcon Kramer; Marilyn E. Noz; Dorothy McCauley; Abraham Chachoua; and Alan Steinfeld

1995-12-01T23:59:59.000Z

348

Bone scintigraphy (BS) may no longer be relevant in the era of integrated PET/CT for women undergoing evaluation for suspected metastatic breast cancer (MBC).  

Science Journals Connector (OSTI)

...women undergoing extent-of-disease (EOD) evaluation for suspected MBC. Methods: Women undergoing EOD evaluation for suspected MBC with integrated...CT in detecting osseous metastases when EOD evaluation for suspected MBC is considered...

HL McArthur; C Lynch; P Morris; S Larson; K Grabski; J Howard; S Patil; CA Hudis; MN Dickler

2009-02-19T23:59:59.000Z

349

PREFECTURE-WIDE MULTI-CENTRE RADIATION DOSE SURVEY AS A USEFUL TOOL FOR CT DOSE OPTIMISATION: REPORT OF GUNMA RADIATION DOSE STUDY  

Science Journals Connector (OSTI)

......as two or more different patients with each undergoing a single CT session. The anatomical regions were divided into head (brain), face, neck, chest, upper abdomen, pelvis (lower abdomen) and coronary. When a patient was scanned in two or more......

Yasuhiro Fukushima; Ayako Taketomi-Takahashi; Takahito Nakajima; Yoshito Tsushima

2014-10-01T23:59:59.000Z

350

Application of X-ray CT for investigating fluid flow and conformance control during CO2 injection in highly heterogeneous media  

E-Print Network [OSTI]

were performed using homogeneous and heterogeneous cores and a 4th generation X-Ray CT scanner was used to visualize heterogeneity and fluid flow in the core. Porosity and saturation measurements were made during the course of the experiment...

Chakravarthy, Deepak

2005-08-29T23:59:59.000Z

351

Effects of ceftriaxone on ethanol intake: a possible role for xCT and GLT-1 isoforms modulation of glutamate levels in P rats  

Science Journals Connector (OSTI)

Evidence suggests that glutamate transporter 1 (GLT-1) and cystine/glutamate exchanger transporter (xCT) are critical in maintaining glutamate homeostasis. We have recently demonstrated that ceftriaxone treatment...

Hasan Alhaddad; Sujan C. Das; Youssef Sari

2014-10-01T23:59:59.000Z

352

PET Motion Compensation for Radiation Therapy Using a CT-Based Mid-Position Motion Model: Methodology and Clinical Evaluation  

SciTech Connect (OSTI)

Purpose: Four-dimensional positron emission tomography (4D PET) imaging of the thorax produces sharper images with reduced motion artifacts. Current radiation therapy planning systems, however, do not facilitate 4D plan optimization. When images are acquired in a 2-minute time slot, the signal-to-noise ratio of each 4D frame is low, compromising image quality. The purpose of this study was to implement and evaluate the construction of mid-position 3D PET scans, with motion compensated using a 4D computed tomography (CT)-derived motion model. Methods and Materials: All voxels of 4D PET were registered to the time-averaged position by using a motion model derived from the 4D CT frames. After the registration the scans were summed, resulting in a motion-compensated 3D mid-position PET scan. The method was tested with a phantom dataset as well as data from 27 lung cancer patients. Results: PET motion compensation using a CT-based motion model improved image quality of both phantoms and patients in terms of increased maximum SUV (SUV{sub max}) values and decreased apparent volumes. In homogenous phantom data, a strong relationship was found between the amplitude-to-diameter ratio and the effects of the method. In heterogeneous patient data, the effect correlated better with the motion amplitude. In case of large amplitudes, motion compensation may increase SUV{sub max} up to 25% and reduce the diameter of the 50% SUV{sub max} volume by 10%. Conclusions: 4D CT-based motion-compensated mid-position PET scans provide improved quantitative data in terms of uptake values and volumes at the time-averaged position, thereby facilitating more accurate radiation therapy treatment planning of pulmonary lesions.

Kruis, Matthijs F.; Kamer, Jeroen B. van de; Houweling, Antonetta C.; Sonke, Jan-Jakob; Belderbos, José S.A.; Herk, Marcel van, E-mail: m.v.herk@nki.nl

2013-10-01T23:59:59.000Z

353

Exposure to Ionizing Radiation and Estimate of Secondary Cancers in the Era of High-Speed CT Scanning: Projections From the Medicare Population  

Science Journals Connector (OSTI)

Purpose The aims of this study were to analyze the distribution and amount of ionizing radiation delivered by CT scans in the modern era of high-speed CT and to estimate cancer risk in the elderly, the patient group most frequently imaged using CT scanning. Methods A retrospective cohort study was conducted using Medicare claims spanning 8 years (1998-2005) to assess CT use. The data were analyzed in two 4-year cohorts, 1998 to 2001 (n = 5,267,230) and 2002 to 2005 (n = 5,555,345). The number and types of CT scans each patient received over the 4-year periods were analyzed to determine the percentage of patients exposed to threshold radiation of 50 to 100 mSv (defined as low) and >100 mSv (defined as high). The National Research Council's Biological Effects of Ionizing Radiation VII models were used to estimate the number of radiation-induced cancers. Results CT scans of the head were the most common examinations in both Medicare cohorts, but abdominal imaging delivered the greatest proportion (43% in the first cohort and 40% in the second cohort) of radiation. In the 1998 to 2001 cohort, 42% of Medicare patients underwent CT scans, with 2.2% and 0.5% receiving radiation doses in the low and high ranges, respectively. In the 2002 to 2005 cohort, 50% of Medicare patients received CT scans, with 4.2% and 1.2% receiving doses in the low and high ranges. In the two populations, 1,659 (0.03%) and 2,185 (0.04%) cancers related to ionizing radiation were estimated, respectively. Conclusions Although radiation doses have been increasing along with the increasing reliance on CT scans for diagnosis and therapy, using conservative estimates with worst-case scenario methodology, the authors found that the risk for secondary cancers is low in older adults, the group subjected to the most frequent CT scanning. Trends showing increasing use, however, underscore the importance of monitoring CT utilization and its consequences.

Aabed B. Meer; Pat A. Basu; Laurence C. Baker; Scott W. Atlas

2012-01-01T23:59:59.000Z

354

CT Scan Not Only a Medical Technique NETL Wins Two 2008  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

S . D e p a r t m e n t o f E n e r g y * O f f i c e o f F o s s i l E n e r g y * N a t i o n a l E n e r g y Te c h n o l o g y L a b o r a t o r y S . D e p a r t m e n t o f E n e r g y * O f f i c e o f F o s s i l E n e r g y * N a t i o n a l E n e r g y Te c h n o l o g y L a b o r a t o r y CT Scan Not Only a Medical Technique NETL Wins Two 2008 R&D 100 Awards First Measurements at Oxy-Fuel Flame Test Facility NETL's R&D newsletter January 2008 / issue 8 October 2008, Issue 11 CONTENTS Medical Technique Adopted to Study Mobility of CO 2 in Coal ____________________________________________ 2 Two Technologies Chosen for 2008 R&D 100 Awards _____ 3 Computer Code for Geologic Sequestration Modified for Parallel Computers ________________________________

355

Introduction of heat map to fidelity assessment of compressed CT images  

SciTech Connect (OSTI)

Purpose: This study aimed to introduce heat map, a graphical data presentation method widely used in gene expression experiments, to the presentation and interpretation of image fidelity assessment data of compressed computed tomography (CT) images. Methods: The authors used actual assessment data that consisted of five radiologists' responses to 720 computed tomography images compressed using both Joint Photographic Experts Group 2000 (JPEG2000) 2D and JPEG2000 3D compressions. They additionally created data of two artificial radiologists, which were generated by partly modifying the data from two human radiologists. Results: For each compression, the entire data set, including the variations among radiologists and among images, could be compacted into a small color-coded grid matrix of the heat map. A difference heat map depicted the advantage of 3D compression over 2D compression. Dendrograms showing hierarchical agglomerative clustering results were added to the heat maps to illustrate the similarities in the data patterns among radiologists and among images. The dendrograms were used to identify two artificial radiologists as outliers, whose data were created by partly modifying the responses of two human radiologists. Conclusions: The heat map can illustrate a quick visual extract of the overall data as well as the entirety of large complex data in a compact space while visualizing the variations among observers and among images. The heat map with the dendrograms can be used to identify outliers or to classify observers and images based on the degree of similarity in the response patterns.

Lee, Hyunna; Kim, Bohyoung; Seo, Jinwook; Park, Seongjin; Shin, Yeong-Gil [School of Computer Science and Engineering, Seoul National University, 599 Kwanak-ro, Kwanak-gu, Seoul 151-742 (Korea, Republic of); Kim, Kil Joong [Department of Radiation Applied Life Science, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744 (Korea, Republic of); Lee, Kyoung Ho [Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Institute of Radiation Medicine and Seoul National University Medical Research Center, 300 Gumi-dong, Bundang-gu, Seongnam-si, Gyeonggi-do 463-707 (Korea, Republic of)

2011-08-15T23:59:59.000Z

356

Combined iterative reconstruction and image-domain decomposition for dual energy CT using total-variation regularization  

SciTech Connect (OSTI)

Purpose: Dual-energy CT (DECT) is being increasingly used for its capability of material decomposition and energy-selective imaging. A generic problem of DECT, however, is that the decomposition process is unstable in the sense that the relative magnitude of decomposed signals is reduced due to signal cancellation while the image noise is accumulating from the two CT images of independent scans. Direct image decomposition, therefore, leads to severe degradation of signal-to-noise ratio on the resultant images. Existing noise suppression techniques are typically implemented in DECT with the procedures of reconstruction and decomposition performed independently, which do not explore the statistical properties of decomposed images during the reconstruction for noise reduction. In this work, the authors propose an iterative approach that combines the reconstruction and the signal decomposition procedures to minimize the DECT image noise without noticeable loss of resolution. Methods: The proposed algorithm is formulated as an optimization problem, which balances the data fidelity and total variation of decomposed images in one framework, and the decomposition step is carried out iteratively together with reconstruction. The noise in the CT images from the proposed algorithm becomes well correlated even though the noise of the raw projections is independent on the two CT scans. Due to this feature, the proposed algorithm avoids noise accumulation during the decomposition process. The authors evaluate the method performance on noise suppression and spatial resolution using phantom studies and compare the algorithm with conventional denoising approaches as well as combined iterative reconstruction methods with different forms of regularization. Results: On the Catphan©600 phantom, the proposed method outperforms the existing denoising methods on preserving spatial resolution at the same level of noise suppression, i.e., a reduction of noise standard deviation by one order of magnitude. This improvement is mainly attributed to the high noise correlation in the CT images reconstructed by the proposed algorithm. Iterative reconstruction using different regularization, including quadratic orq-generalized Gaussian Markov random field regularization, achieves similar noise suppression from high noise correlation. However, the proposed TV regularization obtains a better edge preserving performance. Studies of electron density measurement also show that our method reduces the average estimation error from 9.5% to 7.1%. On the anthropomorphic head phantom, the proposed method suppresses the noise standard deviation of the decomposed images by a factor of ?14 without blurring the fine structures in the sinus area. Conclusions: The authors propose a practical method for DECT imaging reconstruction, which combines the image reconstruction and material decomposition into one optimization framework. Compared to the existing approaches, our method achieves a superior performance on DECT imaging with respect to decomposition accuracy, noise reduction, and spatial resolution.

Dong, Xue; Niu, Tianye; Zhu, Lei, E-mail: leizhu@gatech.edu [Nuclear and Radiological Engineering and Medical Physics Programs, The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)] [Nuclear and Radiological Engineering and Medical Physics Programs, The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)

2014-05-15T23:59:59.000Z

357

One of the remarkable dis-coveries in astrophysics has  

E-Print Network [OSTI]

, the galaxies, and everything we know." With the discovery of dark energy ten years ago, a better understanding as dark energy, a uniform background field that is accelerating the expansion of the universe. The pres- ence of dark energy suggests a fundamental gap in our current understanding of the basic forces

358

Visualizing Mathematics Modules 1 (Dis)Orientation--Getting Started  

E-Print Network [OSTI]

-Ray, http://www.povray.org · SketchUp, http://www.sketchup.com 4. Mathematical tools for describing three your own computer, install the software listed above. Start playing with SketchUp, GeoGebra, and Open

Lee, Carl

359

Simultaneous QCD analysis of diffractive and inclusive DIS data  

E-Print Network [OSTI]

We perform a NLO QCD analysis of deep-inelastic scattering data, in which we account for absorptive corrections. These corrections are determined from a simultaneous analysis of diffractive deep-inelastic data. The absorptive effects are found to enhance the size of the gluon distribution at small x, such that a negative input gluon distribution at Q^2 = 1 GeV^2 is no longer required. We discuss the problem that the gluon distribution is valence-like at low scales, whereas the sea quark distribution grows with decreasing x. Our study hints at the possible importance of power corrections for Q^2 \\simeq 1--2 GeV^2.

Martin, A D; Watt, G

2004-01-01T23:59:59.000Z

360

DisProt: a database of protein disorder  

Science Journals Connector (OSTI)

......intrinsically disordered proteins or regions...as dynamic ensembles in which...intrinsically disordered proteins fail to form...instead as ensembles of conformations...intrinsically disordered proteins or regions...as dynamic ensembles in which......

Slobodan Vucetic; Zoran Obradovic; Vladimir Vacic; Predrag Radivojac; Kang Peng; Lilia M. Iakoucheva; Marc S. Cortese; J. David Lawson; Celeste J. Brown; Jason G. Sikes; Crystal D. Newton; A. Keith Dunker

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

News from the proton - recent DIS results from HERA  

SciTech Connect (OSTI)

Recent results from the two large general-purpose detectors H1 and ZEUS at HERA (DESY, Hamburg, Germany) are presented. Emphasis is given to the analysis of deep inelastic scattering defined by the observation of the scattered electron or positron in the main calorimeters. Results on purely inclusive cross sections lead to a determination of the charged (quarks) parton distribution F{sub 2}(x, Q{sup 2}). Access to the electrically neutral parton content (gluons) is obtained indirectly by an analysis of the expected scaling violation behavior of F{sub 2} or directly from multijet rates originating from well-defined initial parton configurations. Finally, the recently uncovered subclass of large rapidity gap (LRG) events has been analyzed in terms of F{sub 2}. The result supports the concept of a color neutral object (Pomeron IP) being probed by a hard scattering electron. Evidence for factorization of the Pomeron radiation process as well as for scaling in the inclusive IP structure functions has been found.

Meier, K. [Heidelberg Univ. (Germany)

1997-01-01T23:59:59.000Z

362

Investigations of hadronization process in DIS at CLAS  

SciTech Connect (OSTI)

Hadronization is the process through which partons, created in an elementary reaction, turn into hadrons. This phenomena has been studied for decades, however, the space-time features of this fundamentally non-perturbative process is not clearly understood. Semi-inclusive measurements of deep inelastic electron scattering from nuclei provide a unique testing ground to study the process of hadron formation. The space-time features and the nuclear dependence of quark propagation and hadronization can be extracted by comparing the production of various hadronic species from a number of target nuclei under different kinematic conditions. The CLAS experiment E02-104 was run with a variety of nuclear targets using a 5 GeV beam energy. The goal of this experiment is to measure observables related to propagation of a quark through cold nuclear matter.

A. Daniel, K. Hicks

2010-04-01T23:59:59.000Z

363

Institutes and Centers.DIS 1 Weizmann Institute of Science  

E-Print Network [OSTI]

Center for the Biology of Aging Prof Head, The Carl and Micaela Einhorn-Dominic Center for Brain Research and Immunological Disorders Prof Head, The Murray H. & Meyer Grodetsky Center for Research of High Brain Functions Center for Brain Imaging Prof Head, The Willner Family Center for Vascular Biology Prof #12;Institutes

Shapiro, Ehud

364

Construction, Concentration, and (Dis)Continuities in Social Valuations  

E-Print Network [OSTI]

I review and integrate recent sociological research that makes progress on three interrelated questions pertaining to social valuation: (a) the degree of social construction relative to objective constraints; (b) the degree ...

Zuckerman Sivan, Ezra W.

365

A robust and efficient approach to detect 3D rectal tubes from CT colonography  

SciTech Connect (OSTI)

Purpose: The rectal tube (RT) is a common source of false positives (FPs) in computer-aided detection (CAD) systems for CT colonography. A robust and efficient detection of RT can improve CAD performance by eliminating such ''obvious'' FPs and increase radiologists' confidence in CAD. Methods: In this paper, we present a novel and robust bottom-up approach to detect the RT. Probabilistic models, trained using kernel density estimation on simple low-level features, are employed to rank and select the most likely RT tube candidate on each axial slice. Then, a shape model, robustly estimated using random sample consensus (RANSAC), infers the global RT path from the selected local detections. Subimages around the RT path are projected into a subspace formed from training subimages of the RT. A quadratic discriminant analysis (QDA) provides a classification of a subimage as RT or non-RT based on the projection. Finally, a bottom-top clustering method is proposed to merge the classification predictions together to locate the tip position of the RT. Results: Our method is validated using a diverse database, including data from five hospitals. On a testing data with 21 patients (42 volumes), 99.5% of annotated RT paths have been successfully detected. Evaluated with CAD, 98.4% of FPs caused by the RT have been detected and removed without any loss of sensitivity. Conclusions: The proposed method demonstrates a high detection rate of the RT path, and when tested in a CAD system, reduces FPs caused by the RT without the loss of sensitivity.

Yang Xiaoyun; Slabaugh, Greg [Medicsight PLC, Kensington Centre, 66 Hammersmith Road, London (United Kingdom)

2011-11-15T23:59:59.000Z

366

1 Get Onto Matlab 2 Try This....  

E-Print Network [OSTI]

MATLAB is an interactive, matrix-based system for scienti c and engineering ... matrix analysis, solver for ordinary and partial di erential equations, graph plotter

2006-08-22T23:59:59.000Z

367

Summon [ try out ] How to use Summon  

E-Print Network [OSTI]

'). The terms you enter may occur in the publication loose from one another. Put your search terms between: advanced search: enter search terms as words from publication titles #12;3 Type * to search for all endings: advanced search: enter search terms in specific search boxes Full-text linking in Summon Clicking

Franssen, Michael

368

Constrained tri-sphere kinematic positioning system  

DOE Patents [OSTI]

A scalable and adaptable, six-degree-of-freedom, kinematic positioning system is described. The system can position objects supported on top of, or suspended from, jacks comprising constrained joints. The system is compatible with extreme low temperature or high vacuum environments. When constant adjustment is not required a removable motor unit is available.

Viola, Robert J (Jackson, WY)

2010-12-14T23:59:59.000Z

369

Tsukuba Science City: Japan Tries Planned Innovation  

Science Journals Connector (OSTI)

...including part of Raw Silk and/_\\ Reors Horticulture Bureau) (48)/s_(53) Mtooia National...surface condition, traffic control, and lighting are studied in the context of kinematics...used for experi-ments in ventilation, lighting, fire pre-vention and control, and...

Justin L. Bloom; Shinsuke Asano

1981-06-12T23:59:59.000Z

370

Tri-Party Agreement Project Manager's List  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

As of December 17, 2014 Prepared by MSA TPA Site-Wide Integration Milestone EPA PM Ecology PM DOE PM Assistant Manager Lead Regulatory Agency (See Footnote) Type Milestone...

371

Endangered Species: Diplomacy Tries Building an Ark  

Science Journals Connector (OSTI)

...generous in issuing export per-mits. For...the issuance of an export per-mit until an...certified promise of an import permit from another...in gas or domestic petroleum explora-tion at...scrapping the oil import quota system. And...People's Republic of China) under one roof...

Robert Gillette

1973-02-23T23:59:59.000Z

372

Establishing a process of irradiating small animal brain using a CyberKnife and a microCT scanner  

SciTech Connect (OSTI)

Purpose: Establish and validate a process of accurately irradiating small animals using the CyberKnife G4 System (version 8.5) with treatment plans designed to irradiate a hemisphere of a mouse brain based on microCT scanner images. Methods: These experiments consisted of four parts: (1) building a mouse phantom for intensity modulated radiotherapy (IMRT) quality assurance (QA), (2) proving usability of a microCT for treatment planning, (3) fabricating a small animal positioning system for use with the CyberKnife's image guided radiotherapy (IGRT) system, and (4)in vivo verification of targeting accuracy. A set of solid water mouse phantoms was designed and fabricated, with radiochromic films (RCF) positioned in selected planes to measure delivered doses. After down-sampling for treatment planning compatibility, a CT image set of a phantom was imported into the CyberKnife treatment planning system—MultiPlan (ver. 3.5.2). A 0.5 cm diameter sphere was contoured within the phantom to represent a hemispherical section of a mouse brain. A nude mouse was scanned in an alpha cradle using a microCT scanner (cone-beam, 157 × 149 pixels slices, 0.2 mm longitudinal slice thickness). Based on the results of our positional accuracy study, a planning treatment volume (PTV) was created. A stereotactic body mold of the mouse was “printed” using a 3D printer laying UV curable acrylic plastic. Printer instructions were based on exported contours of the mouse's skin. Positional reproducibility in the mold was checked by measuring ten CT scans. To verify accurate dose delivery in vivo, six mice were irradiated in the mold with a 4 mm target contour and a 2 mm PTV margin to 3 Gy and sacrificed within 20 min to avoid DNA repair. The brain was sliced and stained for analysis. Results: For the IMRT QA using a set of phantoms, the planned dose (6 Gy to the calculation point) was compared to the delivered dose measured via film and analyzed using Gamma analysis (3% and 3 mm). A passing rate of 99% was measured in areas of above 40% of the prescription dose. The final inverse treatment plan was comprised of 43 beams ranging from 5 to 12.5 mm in diameter (2.5 mm size increments are available up to 15 mm in diameter collimation). Using the Xsight Spine Tracking module, the CyberKnife system could not reliably identify and track the tiny mouse spine; however, the CyberKnife system could identify and track the fiducial markers on the 3D mold.In vivo positional accuracy analysis using the 3D mold generated a mean error of 1.41 mm ± 0.73 mm when fiducial markers were used for position tracking. Analysis of the dissected brain confirmed the ability to target the correct brain volume. Conclusions: With the use of a stereotactic body mold with fiducial markers, microCT imaging, and resolution down-sampling, the CyberKnife system can successfully perform small-animal radiotherapy studies.

Kim, Haksoo; Welford, Scott [Department of Radiation Oncology, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106 (United States)] [Department of Radiation Oncology, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106 (United States); Fabien, Jeffrey; Zheng, Yiran; Yuan, Jake; Brindle, James; Yao, Min; Lo, Simon; Wessels, Barry; Machtay, Mitchell; Sohn, Jason W., E-mail: jason.sohn@case.edu [Department of Radiation Oncology, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106 and University Hospitals of Cleveland, 11100 Euclid Avenue, Cleveland, Ohio 44106 (United States); Sloan, Andrew [Department of Neurosurgery, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106 (United States)] [Department of Neurosurgery, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106 (United States)

2014-02-15T23:59:59.000Z

373

Fuel saving, carbon dioxide emission avoidance, and syngas production by tri-reforming of flue gases from coal- and gas-fired power stations, and by the carbothermic reduction of iron oxide  

Science Journals Connector (OSTI)

Flue gases from coal, gas, or oil-fired power stations, as well as from several heavy industries, such as the production of iron, lime and cement, are major anthropogenic sources of global CO2 emissions. The newly proposed process for syngas production based on the tri-reforming of such flue gases with natural gas could be an important route for CO2 emission avoidance. In addition, by combining the carbothermic reduction of iron oxide with the partial oxidation of the carbon source, an overall thermoneutral process can be designed for the co-production of iron and syngas rich in CO. Water-gas shift (WGS) of CO to H2 enables the production of useful syngas. The reaction process heat, or the conditions for thermoneutrality, are derived by thermochemical equilibrium calculations. The thermodynamic constraints are determined for the production of syngas suitable for methanol, hydrogen, or ammonia synthesis. The environmental and economic consequences are assessed for large-scale commercial production of these chemical commodities. Preliminary evaluations with natural gas, coke, or coal as carbon source indicate that such combined processes should be economically competitive, as well as promising significant fuel saving and CO2 emission avoidance. The production of ammonia in the above processes seems particularly attractive, as it consumes the nitrogen in the flue gases.

M. Halmann; A. Steinfeld

2006-01-01T23:59:59.000Z

374

Tumor Tracking Method Based on a Deformable 4D CT Breathing Motion Model Driven by an External Surface Surrogate  

SciTech Connect (OSTI)

Purpose: To develop a tumor tracking method based on a surrogate-driven motion model, which provides noninvasive dynamic localization of extracranial targets for the compensation of respiration-induced intrafraction motion in high-precision radiation therapy. Methods and Materials: The proposed approach is based on a patient-specific breathing motion model, derived a priori from 4-dimensional planning computed tomography (CT) images. Model parameters (respiratory baseline, amplitude, and phase) are retrieved and updated at each treatment fraction according to in-room radiography acquisition and optical surface imaging. The baseline parameter is adapted to the interfraction variations obtained from the daily cone beam (CB) CT scan. The respiratory amplitude and phase are extracted from an external breathing surrogate, estimated from the displacement of the patient thoracoabdominal surface, acquired with a noninvasive surface imaging device. The developed method was tested on a database of 7 lung cancer patients, including the synchronized information on internal and external respiratory motion during a CBCT scan. Results: About 30 seconds of simultaneous acquisition of CBCT and optical surface images were analyzed for each patient. The tumor trajectories identified in CBCT projections were used as reference and compared with the target trajectories estimated from surface displacement with the a priori motion model. The resulting absolute differences between the reference and estimated tumor motion along the 2 image dimensions ranged between 0.7 and 2.4 mm; the measured phase shifts did not exceed 7% of the breathing cycle length. Conclusions: We investigated a tumor tracking method that integrates breathing motion information provided by the 4-dimensional planning CT with surface imaging at the time of treatment, representing an alternative approach to point-based external–internal correlation models. Although an in-room radiograph-based assessment of the reliability of the motion model is envisaged, the developed technique does not involve the estimation and continuous update of correlation parameters, thus requiring a less intense use of invasive imaging.

Fassi, Aurora, E-mail: aurora.fassi@mail.polimi.it [Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milano (Italy); Schaerer, Joël; Fernandes, Mathieu [CREATIS, CNRS UMR 5220, INSERM U1044, Université Lyon 1, INSA-Lyon, Villeurbanne (France); Department of Radiotherapy, Centre Léon Bérard, Lyon (France); Riboldi, Marco [Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milano (Italy); Bioengineering Unit, CNAO Foundation, Pavia (Italy); Sarrut, David [CREATIS, CNRS UMR 5220, INSERM U1044, Université Lyon 1, INSA-Lyon, Villeurbanne (France); Department of Radiotherapy, Centre Léon Bérard, Lyon (France); Baroni, Guido [Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milano (Italy); Bioengineering Unit, CNAO Foundation, Pavia (Italy)

2014-01-01T23:59:59.000Z

375

Screening of mixed surfactant systems: Phase behavior studies and CT imaging of surfactant-enhanced oil recovery experiments  

SciTech Connect (OSTI)

A systematic chemical screening study was conducted on selected anionic-nonionic and nonionic-nonionic systems. The objective of the study was to evaluate and determine combinations of these surfactants that would exhibit favorable phase behavior and solubilization capacity. The effects of different parameters including (a) salinity, (b) temperature, (c) alkane carbon number, (c) hydrophilic/lipophilic balance (HLB) of nonionic component, and (d) type of surfactant on the behavior of the overall chemical system were evaluated. The current work was conducted using a series of ethoxylated nonionic surfactants in combinations of several anionic systems with various hydrocarbons. Efforts to correlate the behavior of these mixed systems led to the development of several models for the chemical systems tested. The models were used to compare the different systems and provided some guidelines for formulating them to account for variations in salinity, oil hydrocarbon number, and temperature. The models were also evaluated to determine conformance with the results from experimental measurements. The models provided good agreement with experimental results. X-ray computed tomography (CT) was used to study fluid distributions during chemical enhanced oil recovery experiments. CT-monitored corefloods were conducted to examine the effect of changing surfactant slug size injection on oil bank formation and propagation. Reducing surfactant slug size resulted in lower total oil production. Oil recovery results, however, did not correlate with slug size for the low-concentration, alkaline, mixed surfactant system used in these tests. The CT measurements showed that polymer mobility control and core features also affected the overall oil recovery results.

Llave, F.M.; Gall, B.L.; Lorenz, P.B.; Cook, I.M.; Scott, L.J.

1993-11-01T23:59:59.000Z

376

TH?D?201C?08: Multi?Modal MRI SPECT and CT Imaging of Theranostic Nanoplatforms  

Science Journals Connector (OSTI)

Purpose: The development of non?invasive imaging techniques for the assessment of cancer treatment is rapidly becoming highly important. Magnetic Cationic Liposomes (MCL) that carry a cargo of anti?cancer drugs and magnetic nanoparticles that will selectively target primary and metastatic cancertumorsdeliver drugs to them and visualize their effects through magnetic resonance imaging(MRI)single photon emission computed tomography(SPECT) and fluorescence spectroscopy. The aim of the present study is to evaluate MCL as a versatile theranostic nanoplatform for enhanced drug deliveryimaging and monitoring of cancer treatment. Materials and Method: Poly?ethyleneglycol (PEG) coated cationic liposomes are loaded with superparamagnetic iron oxide nanoparticles (SPIONS) and tagged with the radioisotope Indium?111. MCL was administered to SCID mouse with metastatic (B16?F10) melanoma grown in the right flank. Pre?injection and post?injection MR and SPECT/CT images were used to assess response to magnetic targeting effects and tumor and organ distribution. Results:Tumor signal intensities in T2 weighted images decreased an average of 20±5% and T2* values decreased and average of 14±7ms in the absence of magnetic targeting. This compares to an average signal decrease of 57±12% and a decrease in T2* relaxation times of 27±8ms with the aid of external magnet showing up to 2?fold greater accumulation by magnetic targeting. SPECT/CT images showed the localization and distribution of MCL in the tumor.Conclusion: MR SPECT/CT and biodistribution analyses clearly show the efficacy of MCL as MRI contrast agents prove the use of magnetic guidance and demonstrate the potential of MCL as agents for imaging guidance and therapeutic delivery.

F Reynoso; E Gultepe; A Jhaveri; P Kulkarni; B Gershman; C Ferris; R Campbell; M Harisinghani; S Sridhar

2010-01-01T23:59:59.000Z

377

Image-guided radiotherapy for prostate cancer by CT-linear accelerator combination: Prostate movements and dosimetric considerations  

SciTech Connect (OSTI)

Purpose: Multiple studies have indicated that the prostate is not stationary and can move as much as 2 cm. Such prostate movements are problematic for intensity-modulated radiotherapy, with its associated tight margins and dose escalation. Because of these intrinsic daily uncertainties, a relative generous 'margin' is necessary to avoid marginal misses. Using the CT-linear accelerator combination in the treatment suite (Primatom, Siemens), we found that the daily intrinsic prostate movements can be easily corrected before each radiotherapy session. Dosimetric calculations were performed to evaluate the amount of discrepancy of dose to the target if no correction was done for prostate movement. Methods and materials: The Primatom consists of a Siemens Somatom CT scanner and a Siemens Primus linear accelerator installed in the same treatment suite and sharing a common table/couch. The patient is scanned by the CT scanner, which is movable on a pair of horizontal rails. During scanning, the couch does not move. The exact location of the prostate, seminal vesicles, and rectum are identified and localized. These positions are then compared with the planned positions. The daily movement of the prostate and rectum were corrected for and a new isocenter derived. The patient was treated immediately using the new isocenter. Results: Of the 108 patients with primary prostate cancer studied, 540 consecutive daily CT scans were performed during the last part of the cone down treatment. Of the 540 scans, 46% required no isocenter adjustments for the AP-PA direction, 54% required a shift of {>=}3 mm, 44% required a shift of >5 mm, and 15% required a shift of >10 mm. In the superoinferior direction, 27% required a shift of >3 mm, 25% required a shift of >5 mm, and 4% required a shift of >10 mm. In the right-left direction, 34% required a shift of >3 mm, 24% required a shift of >5 mm, and 5% required a shift of >10 mm. Dosimetric calculations for a typical case of prostate cancer using intensity-modulated radiotherapy with 5-mm margin coverage from the clinical target volume (prostate gland) was performed. With a posterior shift of 10 mm for the prostate, the dose coverage dropped from 95-107% to 71-100% coverage. Conclusion: We have described a technique that corrects for the daily prostate motion, allowing for extremely precise prostate cancer treatment. This technique has significant implications for dose escalation and for decreasing rectal complications in the treatment of prostate cancer.

Wong, James R. [Carol G. Simon Cancer Center, Morristown Memorial Hospital/Atlantic Health System, Morristown, NJ (United States); Department of Radiation Oncology, New York Presbyterian Hospital, Columbia University College of Physicians and Surgeons, New York, NY (United States); Grimm, Lisa [Carol G. Simon Cancer Center, Morristown Memorial Hospital/Atlantic Health System, Morristown, NJ (United States); Uematsu, Minoru [National Defense Medical College, Namiki, Tokorozawa (Japan); Oren, Reva [Carol G. Simon Cancer Center, Morristown Memorial Hospital/Atlantic Health System, Morristown, NJ (United States); Cheng, C.W. [Carol G. Simon Cancer Center, Morristown Memorial Hospital/Atlantic Health System, Morristown, NJ (United States); Merrick, Scott; Schiff, Peter [Department of Radiation Oncology, New York Presbyterian Hospital, Columbia University College of Physicians and Surgeons, New York, NY (United States)

2005-02-01T23:59:59.000Z

378

A prototype fan-beam optical CT scanner for 3D dosimetry  

SciTech Connect (OSTI)

Purpose: The objective of this work is to introduce a prototype fan-beam optical computed tomography scanner for three-dimensional (3D) radiation dosimetry. Methods: Two techniques of fan-beam creation were evaluated: a helium-neon laser (HeNe, {lambda} = 543 nm) with line-generating lens, and a laser diode module (LDM, {lambda} = 635 nm) with line-creating head module. Two physical collimator designs were assessed: a single-slot collimator and a multihole collimator. Optimal collimator depth was determined by observing the signal of a single photodiode with varying collimator depths. A method of extending the dynamic range of the system is presented. Two sample types were used for evaluations: nondosimetric absorbent solutions and irradiated polymer gel dosimeters, each housed in 1 liter cylindrical plastic flasks. Imaging protocol investigations were performed to address ring artefacts and image noise. Two image artefact removal techniques were performed in sinogram space. Collimator efficacy was evaluated by imaging highly opaque samples of scatter-based and absorption-based solutions. A noise-based flask registration technique was developed. Two protocols for gel manufacture were examined. Results: The LDM proved advantageous over the HeNe laser due to its reduced noise. Also, the LDM uses a wavelength more suitable for the PRESAGE{sup TM} dosimeter. Collimator depth of 1.5 cm was found to be an optimal balance between scatter rejection, signal strength, and manufacture ease. The multihole collimator is capable of maintaining accurate scatter-rejection to high levels of opacity with scatter-based solutions (T < 0.015%). Imaging protocol investigations support the need for preirradiation and postirradiation scanning to reduce reflection-based ring artefacts and to accommodate flask imperfections and gel inhomogeneities. Artefact removal techniques in sinogram space eliminate streaking artefacts and reduce ring artefacts of up to {approx}40% in magnitude. The flask registration technique was shown to achieve submillimetre and subdegree placement accuracy. Dosimetry protocol investigations emphasize the need to allow gel dosimeters to cool gradually and to be scanned while at room temperature. Preliminary tests show that considerable noise reduction can be achieved with sinogram filtering and by binning image pixels into more clinically relevant grid sizes. Conclusions: This paper describes a new optical CT scanner for 3D radiation dosimetry. Tests demonstrate that it is capable of imaging both absorption-based and scatter-based samples of high opacities. Imaging protocol and gel dosimeter manufacture techniques have been adapted to produce optimal reconstruction results. These optimal results will require suitable filtering and binning techniques for noise reduction purposes.

Campbell, Warren G.; Rudko, D. A.; Braam, Nicolas A.; Jirasek, Andrew [University of Victoria, Victoria, British Columbia V8P 5C2 (Canada); Wells, Derek M. [British Columbia Cancer Agency, Vancouver Island Centre, Victoria, British Columbia V8R 6V5 (Canada)

2013-06-15T23:59:59.000Z

379

Rotational micro-CT using a clinical C-arm angiography gantry  

SciTech Connect (OSTI)

Rotational angiography (RA) gantries are used routinely to acquire sequences of projection images of patients from which 3D renderings of vascular structures are generated using Feldkamp cone-beam reconstruction algorithms. However, these systems have limited resolution (<4 lp/mm). Micro-computed tomography (micro-CT) systems have better resolution (>10 lp/mm) but to date have relied either on rotating object imaging or small bore geometry for small animal imaging, and thus are not used for clinical imaging. The authors report here the development and use of a 3D rotational micro-angiography (RMA) system created by mounting a micro-angiographic fluoroscope (MAF) [35 {mu}m pixel, resolution >10 lp/mm, field of view (FOV)=3.6 cm] on a standard clinical FPD-based RA gantry (Infinix, Model RTP12303J-G9E, Toshiba Medical Systems Corp., Tustin, CA). RA image sequences are obtained using the MAF and reconstructed. To eliminate artifacts due to image truncation, lower-dose (compared to MAF acquisition) full-FOV (FFOV) FPD RA sequences (194 {mu}m pixel, FOV=20 cm) were also obtained to complete the missing data. The RA gantry was calibrated using a helical bead phantom. To ensure high-quality high-resolution reconstruction, the high-resolution images from the MAF were aligned spatially with the lower-dose FPD images, and the pixel values in the FPD image data were scaled to match those of the MAF. Images of a rabbit with a coronary stent placed in an artery in the Circle of Willis were obtained and reconstructed. The MAF images appear well aligned with the FPD images (average correlation coefficient before and after alignment: 0.65 and 0.97, respectively) Greater details without any visible truncation artifacts are seen in 3D RMA (MAF-FPD) images than in those of the FPD alone. The FWHM of line profiles of stent struts (100 {mu}m diameter) are approximately 192{+-}21 and 313{+-}38 {mu}m for the 3D RMA and FPD data, respectively. In addition, for the dual-acquisition 3D RMA, FFOV FPD data need not be of the highest quality, and thus may be acquired at lower dose compared to a standard FPD acquisition. These results indicate that this system could provide the basis for high resolution images of regions of interest in patients with a reduction in the integral dose compared to the standard FPD approach.

Patel, V.; Hoffmann, K. R.; Ionita, C. N.; Keleshis, C.; Bednarek, D. R.; Rudin, S. [Toshiba Stroke Research Center, Department of Physics, State University of New York at Buffalo, Buffalo, New York 14214 (United States); Toshiba Stroke Research Center, Department of Neurosurgery, Department of Physics, Department of Physiology and Biophysics, Department of Mechanical and Aerospace Engineering, and Department of Computer Science, State University of New York at Buffalo, Buffalo, New York 14214 (United States); Toshiba Stroke Research Center, Department of Neurosurgery, State University of New York at Buffalo, Buffalo, New York 14214 (United States); Toshiba Stroke Research Center, Department of Electrical Engineering, State University of New York at Buffalo, Buffalo, New York 14214 (United States); Toshiba Stroke Research Center, Department of Radiology, Department of Neurosurgery, Department of Physics, and Department of Physiology and Biophysics, State University of New York at Buffalo, Buffalo, New York 14214 (United States); Toshiba Stroke Research Center, Department of Radiology, Department of Neurosurgery, Department of Physiology and Biophysics, Department of Mechanical and Aerospace Engineering, and Department of Electrical Engineering, State University of New York at Buffalo, Buffalo, New York 14214 (United States)

2008-10-15T23:59:59.000Z

380

*Tri-Generation is a novel technology that was conceived by the National Fuel Cell Research Center in 2001 to simultaneously generate electricity, hydrogen, and heat. It was developed into the first prototype in collaboration with FuelCell Energy, Inc., a  

E-Print Network [OSTI]

*Tri-Generation is a novel technology that was conceived by the National Fuel Cell Research Center prototype in collaboration with FuelCell Energy, Inc., and Air Products and Chemicals, Inc. The first and fuel cell electric vehicles), there are still emissions associated with the upstream processes

Mease, Kenneth D.

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381

Please cite this article in press as: Gould, M., et al., Judgments of approach speed for motorcycles across different lighting levels and the effect of an improved tri-headlight configuration. Accid. Anal. Prev. (2012), doi:10.1016/j.aap.2012.02.002  

E-Print Network [OSTI]

for motorcycles across different lighting levels and the effect of an improved tri-headlight configuration. Accid. Anal. Prev. (2012), doi:10.1016/j.aap.2012.02.002 Judgments of approach speed for motorcycles across under low levels of luminance. We investigated drivers' judgments of motorcycle and car approach speeds

Royal Holloway, University of London

382

MRI-based Preplanning Using CT and MRI Data Fusion in Patients With Cervical Cancer Treated With 3D-based Brachytherapy: Feasibility and Accuracy Study  

SciTech Connect (OSTI)

Purpose: Magnetic resonance imaging (MRI)-assisted radiation treatment planning enables enhanced target contouring. The purpose of this study is to analyze the feasibility and accuracy of computed tomography (CT) and MRI data fusion for MRI-based treatment planning in an institution where an MRI scanner is not available in the radiotherapy department. Methods and Materials: The registration inaccuracy of applicators and soft tissue was assessed in 42 applications with CT/MRI data fusion. The absolute positional difference of the center of the applicators was measured in four different planes from the top of the tandem to the cervix. Any inaccuracy of registration of soft tissue in relation to the position of applicators was determined and dose-volume parameters for MRI preplans and for CT/MRI fusion plans with or without target and organs at risk (OAR) adaptation were evaluated. Results: We performed 6,132 measurements in 42 CT/MRI image fusions. Median absolute difference of the center of tandem on CT and MRI was 1.1 mm. Median distance between the center of the right ovoid on CT and MRI was 1.7 and 1.9 mm in the laterolateral and anteroposterior direction, respectively. Corresponding values for the left ovoid were 1.6 and 1.8 mm. Rotation of applicators was 3.1 Degree-Sign . Median absolute difference in position of applicators in relation to soft tissue was 1.93, 1.50, 1.05, and 0.84 mm in the respective transverse planes, and 1.17, 1.28, 1.27, and 1.17 mm in selected angular directions. The dosimetric parameters for organs at risk on CT/MRI fusion plans without OAR adaptation were significantly impaired whereas the target coverage was not influenced. Planning without target adaptation led to overdosing of the target volume, especially high-risk clinical target volume - D{sub 90} 88.2 vs. 83.1 (p < 0.05). Conclusions: MRI-based preplanning with consecutive CT/MRI data fusion can be safe and feasible, with an acceptable inaccuracy of soft tissue registration.

Dolezel, Martin, E-mail: dolezelm@email.cz [Oncology Centre, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic) [Oncology Centre, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic); First Faculty of Medicine, Charles University, Prague (Czech Republic); Odrazka, Karel [Oncology Centre, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic) [Oncology Centre, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic); First Faculty of Medicine, Charles University, Prague (Czech Republic); Zizka, Jan [Department of Radiology, Charles University Teaching Hospital, Hradec Kralove (Czech Republic)] [Department of Radiology, Charles University Teaching Hospital, Hradec Kralove (Czech Republic); Vanasek, Jaroslav; Kohlova, Tereza; Kroulik, Tomas [Oncology Centre, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic)] [Oncology Centre, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic); Spitzer, Dusan; Ryska, Pavel [Department of Radiology, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic)] [Department of Radiology, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic); Tichy, Michal; Kostal, Milan [Department of Gynaecology, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic)] [Department of Gynaecology, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic); Jalcova, Lubica [Oncology Centre, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic)] [Oncology Centre, Multiscan and Pardubice Regional Hospital, Pardubice (Czech Republic)

2012-09-01T23:59:59.000Z

383

SU?E?I?41: Study On the CT Radiation Attenuation Characteristics of Human Body for Phantom Design Using Monte Carlo Simulations  

Science Journals Connector (OSTI)

Purpose: The CTDI values measured with standard PMMA phantoms were now being challenged due to the clinical application of new technologies such as automatic tube current modulation(TCM) the aim of this study is to simulate the CT radiation attenuation characteristics of human body along Z?axis which were the basic data of developing new phantoms used to evaluate TCM. Methods: The CT model used in this study has been modeled including the source energy spectrum the bow?tie filter as well and the beam shape. The voxel phantoms RPI Adult Male designed to match the ICRP anatomical references for average individuals were also selected in this study. MCNPX 2.5.0 was used to simulate the 120 kVp CT X?ray attenuation of voxel phantom along the z?axis. Averaged photon flux was tallied before and after it passed though the phantom separately simulations were also carried out using different thickness of PMMA plates instead of the voxel phantom. Results: The CT X?ray attenuation of PMMA and its thickness presents a significant negative exponential relationship with the r2=0.9975. The CT X?ray attenuation data of every 2cm along Z?axis direction of voxel phantom were obtained combined with characteristics of CT X?ray attenuation of PMMA the PMMA equivalent thickness of the voxel phantom torso along the Z?axis direction in terms of CT X?ray attenuation were calculated. The PMMA equivalent thickness ranges from 5.5cm to 30.1cm. The liver and spleen plane which contents substantive organs such as the liver and spleen and bone structure as ribs and the lumbar was the maximum attenuation plane. Conclusion: The trend of the overall attenuation characteristics of the human body in terms of CT X?ray was in accord with the anatomical structure these results could be used to develop new dose phantoms which were used to evaluate automatic tube current modulation with further study. This project was partially funded by National Institutes of Health (National Library of Medicine R01LM009362 and National Institute of Biomedical Imaging and Bioengineering R42EB010404)

h Liu

2013-01-01T23:59:59.000Z

384

Multi-energy CT based on a prior rank, intensity and sparsity model (PRISM) This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network [OSTI]

Multi-energy CT based on a prior rank, intensity and sparsity model (PRISM) This article has been:10.1088/0266-5611/27/11/115012 Multi-energy CT based on a prior rank, intensity and sparsity model and sparsity of a multi-energy image, and intensity/spectral characteristics of base materials. Furthermore, we

Wang, Ge

385

3/26/13 Section of brain does more than expected, Universityof Chicago scientists find -chicagotribune.com www.chicagotribune.com/health/ct-x-monkeys-processing-visual-information-0320-20130320,0,298755.story 1/3  

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- chicagotribune.com www.chicagotribune.com/health/ct-x-monkeys-processing-visual-information-0320 of brain does more than expected, Universityof Chicago scientists find - chicagotribune.com www.chicagotribune.com/health/ct-x-monkeys-processing and troubleshooting HOME PROTECTION PLANS From foundation to fixtures FESTIVAL OF HOMES Five financial things every

Freedman, David J.

386

A Phase II Comparative Study of Gross Tumor Volume Definition With or Without PET/CT Fusion in Dosimetric Planning for Non-Small-Cell Lung Cancer (NSCLC): Primary Analysis of Radiation Therapy Oncology Group (RTOG) 0515  

SciTech Connect (OSTI)

Background: Radiation Therapy Oncology Group (RTOG) 0515 is a Phase II prospective trial designed to quantify the impact of positron emission tomography (PET)/computed tomography (CT) compared with CT alone on radiation treatment plans (RTPs) and to determine the rate of elective nodal failure for PET/CT-derived volumes. Methods: Each enrolled patient underwent definitive radiation therapy for non-small-cell lung cancer ({>=}60 Gy) and had two RTP datasets generated: gross tumor volume (GTV) derived with CT alone and with PET/CT. Patients received treatment using the PET/CT-derived plan. The primary end point, the impact of PET/CT fusion on treatment plans was measured by differences of the following variables for each patient: GTV, number of involved nodes, nodal station, mean lung dose (MLD), volume of lung exceeding 20 Gy (V20), and mean esophageal dose (MED). Regional failure rate was a secondary end point. The nonparametric Wilcoxon matched-pairs signed-ranks test was used with Bonferroni adjustment for an overall significance level of 0.05. Results: RTOG 0515 accrued 52 patients, 47 of whom are evaluable. The follow-up time for all patients is 12.9 months (2.7-22.2). Tumor staging was as follows: II = 6%; IIIA = 40%; and IIIB = 54%. The GTV was statistically significantly smaller for PET/CT-derived volumes (98.7 vs. 86.2 mL; p < 0.0001). MLDs for PET/CT plans were slightly lower (19 vs. 17.8 Gy; p = 0.06). There was no significant difference in the number of involved nodes (2.1 vs. 2.4), V20 (32% vs. 30.8%), or MED (28.7 vs. 27.1 Gy). Nodal contours were altered by PET/CT for 51% of patients. One patient (2%) has developed an elective nodal failure. Conclusions: PET/CT-derived tumor volumes were smaller than those derived by CT alone. PET/CT changed nodal GTV contours in 51% of patients. The elective nodal failure rate for GTVs derived by PET/CT is quite low, supporting the RTOG standard of limiting the target volume to the primary tumor and involved nodes.

Bradley, Jeffrey, E-mail: jbradley@wustl.edu [Department of Radiation Oncology, Washington University School of Medicine, St. Louis, MO (United States); Bae, Kyounghwa [Department of Statistics, RTOG, Philadelphia, PA (United States); Choi, Noah [Massachusetts General Hospital, Boston, MA (United States); Forster, Ken [H. Lee Moffitt Cancer Center, Tampa, FL (United States); Siegel, Barry A. [Department of Radiation Oncology, Washington University School of Medicine, St. Louis, MO (United States); Brunetti, Jacqueline [Holy Name Medical Center, Teaneck, NJ (United States); Purdy, James [University of California at Davis, Davis, CA (United States); Faria, Sergio [McGill University, Montreal (Canada); Vu, Toni [Centre Hospitalier Universitaire de Montreal, Hospital Notre Dame, Montreal (Canada); Thorstad, Wade [Department of Radiation Oncology, Washington University School of Medicine, St. Louis, MO (United States); Choy, Hak [University of Texas Southwestern, Dallas, TX (United States)

2012-01-01T23:59:59.000Z

387

CT-guided Bipolar and Multipolar Radiofrequency Ablation (RF Ablation) of Renal Cell Carcinoma: Specific Technical Aspects and Clinical Results  

SciTech Connect (OSTI)

Purpose. This study was designed to evaluate the clinical efficacy of CT-guided bipolar and multipolar radiofrequency ablation (RF ablation) of renal cell carcinoma (RCC) and to analyze specific technical aspects between both technologies. Methods. We included 22 consecutive patients (3 women; age 74.2 {+-} 8.6 years) after 28 CT-guided bipolar or multipolar RF ablations of 28 RCCs (diameter 2.5 {+-} 0.8 cm). Procedures were performed with a commercially available RF system (Celon AG Olympus, Berlin, Germany). Technical aspects of RF ablation procedures (ablation mode [bipolar or multipolar], number of applicators and ablation cycles, overall ablation time and deployed energy, and technical success rate) were analyzed. Clinical results (local recurrence-free survival and local tumor control rate, renal function [glomerular filtration rate (GFR)]) and complication rates were evaluated. Results. Bipolar RF ablation was performed in 12 procedures and multipolar RF ablation in 16 procedures (2 applicators in 14 procedures and 3 applicators in 2 procedures). One ablation cycle was performed in 15 procedures and two ablation cycles in 13 procedures. Overall ablation time and deployed energy were 35.0 {+-} 13.6 min and 43.7 {+-} 17.9 kJ. Technical success rate was 100 %. Major and minor complication rates were 4 and 14 %. At an imaging follow-up of 15.2 {+-} 8.8 months, local recurrence-free survival was 14.4 {+-} 8.8 months and local tumor control rate was 93 %. GFR did not deteriorate after RF ablation (50.8 {+-} 16.6 ml/min/1.73 m{sup 2} before RF ablation vs. 47.2 {+-} 11.9 ml/min/1.73 m{sup 2} after RF ablation; not significant). Conclusions. CT-guided bipolar and multipolar RF ablation of RCC has a high rate of clinical success and low complication rates. At short-term follow-up, clinical efficacy is high without deterioration of the renal function.

Sommer, C. M., E-mail: christof.sommer@med.uni-heidelberg.de [University Hospital Heidelberg, INF 110, Department of Diagnostic and Interventional Radiology (Germany); Lemm, G.; Hohenstein, E. [Minimally Invasive Therapies and Nuclear Medicine, SLK Kliniken Heilbronn GmbH, Clinic for Radiology (Germany); Bellemann, N.; Stampfl, U. [University Hospital Heidelberg, INF 110, Department of Diagnostic and Interventional Radiology (Germany); Goezen, A. S.; Rassweiler, J. [Clinic for Urology, SLK Kliniken Heilbronn GmbH (Germany); Kauczor, H. U.; Radeleff, B. A. [University Hospital Heidelberg, INF 110, Department of Diagnostic and Interventional Radiology (Germany); Pereira, P. L. [Minimally Invasive Therapies and Nuclear Medicine, SLK Kliniken Heilbronn GmbH, Clinic for Radiology (Germany)

2013-06-15T23:59:59.000Z

388

HDRMC, an accelerated Monte Carlo dose calculator for high dose rate brachytherapy with CT-compatible applicators  

SciTech Connect (OSTI)

Purpose: To present a new accelerated Monte Carlo code for CT-based dose calculations in high dose rate (HDR) brachytherapy. The new code (HDRMC) accounts for both tissue and nontissue heterogeneities (applicator and contrast medium). Methods: HDRMC uses a fast ray-tracing technique and detailed physics algorithms to transport photons through a 3D mesh of voxels representing the patient anatomy with applicator and contrast medium included. A precalculated phase space file for the{sup 192}Ir source is used as source term. HDRM is calibrated to calculated absolute dose for real plans. A postprocessing technique is used to include the exact density and composition of nontissue heterogeneities in the 3D phantom. Dwell positions and angular orientations of the source are reconstructed using data from the treatment planning system (TPS). Structure contours are also imported from the TPS to recalculate dose-volume histograms. Results: HDRMC was first benchmarked against the MCNP5 code for a single source in homogenous water and for a loaded gynecologic applicator in water. The accuracy of the voxel-based applicator model used in HDRMC was also verified by comparing 3D dose distributions and dose-volume parameters obtained using 1-mm{sup 3} versus 2-mm{sup 3} phantom resolutions. HDRMC can calculate the 3D dose distribution for a typical HDR cervix case with 2-mm resolution in 5 min on a single CPU. Examples of heterogeneity effects for two clinical cases (cervix and esophagus) were demonstrated using HDRMC. The neglect of tissue heterogeneity for the esophageal case leads to the overestimate of CTV D90, CTV D100, and spinal cord maximum dose by 3.2%, 3.9%, and 3.6%, respectively. Conclusions: A fast Monte Carlo code for CT-based dose calculations which does not require a prebuilt applicator model is developed for those HDR brachytherapy treatments that use CT-compatible applicators. Tissue and nontissue heterogeneities should be taken into account in modern HDR brachytherapy planning.

Chibani, Omar, E-mail: omar.chibani@fccc.edu; C-M Ma, Charlie [Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111 (United States)] [Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111 (United States)

2014-05-15T23:59:59.000Z

389

54 IEEE TRANSACTIONS ON CIRCUIT THEORY, VOL. CT-15,NO. 1, MARCH 1968 Synthesis of a Class of n-Port Networks  

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54 IEEE TRANSACTIONS ON CIRCUIT THEORY, VOL. CT-15,NO. 1, MARCH 1968 Synthesis of a Class of n-Port ports is connected to a voltage source keep- ing all the other ports short circuited, then all the short-circuited ports are at the same potential. The Zn-node network with a pair of equal conductances joining any two

Thulsiraman, Krishnaiyan

390

Connecticut State Library Address: 231 Capitol Avenue, Hartford, CT 06106 Phone: (860) 757-6540 Fax: 860-757-6542 Connecticut State Library  

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Connecticut State Library · Address: 231 Capitol Avenue, Hartford, CT 06106 · Phone: (860) 757-6540 · Fax: 860-757-6542 Connecticut State Library Office of the Public Records Administrator RIPped records in your custody (office/cubicle/work space). This could be a simple handwritten list or a detailed

Alpay, S. Pamir

391

Geochemical monitoring at Soultz-sous-Forts (France) between October 2006 and March 2007 1 EC Contract SES6-CT-2003-502706  

E-Print Network [OSTI]

in the main fracture and porosity zones of the granite to optimize their permeability. Before the injection Contract SES6-CT-2003-502706 PARTICIPANT ORGANIZATION NAME: BRGM Related with Work Package WP5 (Reservoir of the fractured areas, and recovering significant amounts of drilling wastes (grease, rests of cuttings), rock

Boyer, Edmond

392

Estimates of the image quality and the radiation dose for head and abdomen phantom image acquisition by using dual-energy CT  

Science Journals Connector (OSTI)

Using dual-energy computed tomography (CT) scans, we obtained ... data set by using low- and high-energy scans (usually 80 and 140 kV, ... and the abdomen examinations were performed using single-energy (120 kV) ...

Dae-Hong Kim; Hee-Joung Kim; Chang-Lae Lee…

2012-04-01T23:59:59.000Z

393

ATLAS ATLID Algorithms and Level 2 System Aspects ATBD Contract No 22638/09/NL/CT Page 1 of 49  

E-Print Network [OSTI]

ATLAS ­ ATLID Algorithms and Level 2 System Aspects ATBD Contract No 22638/09/NL/CT Page 1 of 49 Issue 2.2 ATLAS ATLID Algorithms and Level 2 System Aspects Algorithm Theoretical Basis Document (ATBD.P. Donovan G-J van Zadelhoff #12;ATLAS ­ ATLID Algorithms and Level 2 System Aspects ATBD Contract No 22638

Stoffelen, Ad

394

ATLAS ATLID Algorithms and Level 2 System Aspects ATBD Contract No 22638/09/NL/CT Page 1 of 25  

E-Print Network [OSTI]

ATLAS ­ ATLID Algorithms and Level 2 System Aspects ATBD Contract No 22638/09/NL/CT Page 1 of 25 Issue 1.3 ATLAS ATLID Algorithms and Level 2 System Aspects Algorithm Theoretical Basis Document (ATBD-J van Zadelhoff #12;ATLAS ­ ATLID Algorithms and Level 2 System Aspects ATBD Contract No 22638/09/NL

Stoffelen, Ad

395

Connecticut State Library Address: 231 Capitol Avenue, Hartford, CT 06106 Phone: (860) 757-6540 Fax: 860-757-6542 Connecticut State Library  

E-Print Network [OSTI]

Connecticut State Library · Address: 231 Capitol Avenue, Hartford, CT 06106 · Phone: (860) 757-6540 · Fax: 860-757-6542 Connecticut State Library Office of the Public Records Administrator Managing Change periods. 4. Forward state publications to the Connecticut State Library (Pursuant to CGS §11-9d). 5

Alpay, S. Pamir

396

High resolution cortical thickness measurement from clinical CT data G.M. Treece, A.H. Gee, P.M. Mayhew and K.E.S. Poole  

E-Print Network [OSTI]

) methods of assessing hip structure, most notably with multi-detector computed tomography, MDCT (Bouxsein and technically limited by thresholding errors caused by relatively low resolution data sets. Ideally, we wouldHigh resolution cortical thickness measurement from clinical CT data G.M. Treece, A.H. Gee, P

Drummond, Tom

397

Exergetic and exergo-economic analysis of a turboprop engine: a case study for CT7-9C  

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The turboprop engine has played an important role in short haul commuter and military transport aircraft where high speed is not critical. It may provide the aviation sector with one of the most significant means of achieving reduced operating costs through reductions in fuel consumption. This paper deals with exergo-economic analysis of a modern turboprop engine (CT7-9C) with a free power turbine used for a medium-range twin-engine transport plane that was jointly developed as a regional airliner and military transport. The investigated main components of the engine are the compressor, the combustor, the gas generator, the power turbine and the exhaust. Exergetic parameters, along with exergo-economic parameters, have been calculated for each engine component.

Hakan Aydin; Onder Turan; Adnan Midilli; T. Hikmet Karakoc

2012-01-01T23:59:59.000Z

398

Tri-Party Agreement Template and Sample Tri-Party Agreement  

Broader source: Energy.gov [DOE]

Documents outline processes and considerations to help Federal agencies begin U.S. Department of Energy (DOE) energy savings performance contract (ESPC) planning.

399

Comparison of Quantitative EEG to current clinical decision rules for Head CT use in acute mild traumatic brain injury in the ED  

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Abstract Study Objective We compared the performance of a hand-held Quantitative Electroencephalogram (QEEG) acquisition device to New Orleans Criteria (NOC), Canadian CT Head Rule (CCHR) and National Emergency X-Radiography Utilization Study II (NEXUS II) Rule in predicting intracranial lesions on Head CT in acute mild traumatic brain injury (TBI) in the Emergency Department (ED). Methods Patients between 18-80 years of age who presented to the ED with acute blunt head trauma were enrolled in this prospective observational study at two urban academic \\{EDs\\} in Detroit, Michigan. Data was collected for 10 minutes from frontal leads to determine a QEEG discriminant score that could maximally classify intracranial lesions on Head CT. Results: 152 patients were enrolled from July 2012 to February 2013. 17.1% had acute traumatic intracranial lesions on Head CT. QEEG discriminant score of ? 31 was found to be a good cut-off (AUC = 0.84, 95% CI 0.76-0.93) to classify patients with positive head CT. The sensitivity of QEEG discriminant score was 92.3 (95% CI 73.4-98.6) while the specificity was 57.1 (95% CI 48.0-65.8). The sensitivity and specificity of the decision rules were as follows: NOC 96.1 (95% CI 78.4-99.7) and 15.8 (95% CI 10.1-23.6); CCHR 46.1 (95% CI 27.1-66.2) and 86.5 (95% CI 78.9-91.7); NEXUS II 96.1 (95% CI 78.4-99.7) and 31.7 (95% CI 23.9-40.7). Conclusion At a sensitivity of greater than 90%, QEEG discriminant score had better specificity than NOC and NEXUS II. Only CCHR had better specificity than QEEG discriminant score but at the cost of low (< 50%) sensitivity.

Syed Imran Ayaz; Craig Thomas; Andrew Kulek; Rosa Tolomello; Valerie Mika; Duane Robinson; Patrick Medado; Claire Pearson; Leslie S. Prichep; Brian J. O’Neil

2014-01-01T23:59:59.000Z

400

Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT  

SciTech Connect (OSTI)

High-strength and ultra-low-permeability concrete (HSULPC) is thought to be useful as a radioactive waste package. Thus, a high confining ability is desirable. For cementitious materials, sealing of cracks may occur in water due to the precipitation of calcium compounds. This can affect the confining ability. In this study, the sealing of a crack in HSULPC in water was investigated using micro-focus X-ray computed tomography (CT). The sealing by precipitation occurred only around the end of the specimen. Sealed regions of the crack were identified using three-dimensional image registration and CT image subtraction of images obtained for the specimen before and after it was immersed in water to evaluate temporal changes of the sealing deposits in the crack. The sealing deposits increased as the HSULPC specimen was kept in water longer. It was concluded that cracks in HSULPC in water are sealed by precipitation.

Fukuda, Daisuke [Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)] [Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan); Nara, Yoshitaka, E-mail: nara.yoshitaka.2n@kyoto-u.ac.jp [Graduate School of Engineering, Kyoto University, Kyoto 611-8540 (Japan)] [Graduate School of Engineering, Kyoto University, Kyoto 611-8540 (Japan); Kobayashi, Yuya; Maruyama, Megumi; Koketsu, Mayuko [Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)] [Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan); Hayashi, Daisuke; Ogawa, Hideo [Taiheiyo Consultant Co., Ltd., Ohsaku, Sakura 285-8655 (Japan)] [Taiheiyo Consultant Co., Ltd., Ohsaku, Sakura 285-8655 (Japan); Kaneko, Katsuhiko [Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)] [Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)

2012-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "dis tri ct" from the National Library of EnergyBeta (NLEBeta).
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401

Utility of Megavoltage Fan-Beam CT for Treatment Planning in a Head-And-Neck Cancer Patient with Extensive Dental Fillings Undergoing Helical Tomotherapy  

SciTech Connect (OSTI)

The purpose of this study was to demonstrate the potential utility of megavoltage fan-beam computed tomography (MV-FBCT) for treatment planning in a patient undergoing helical tomotherapy for nasopharyngeal carcinoma in the presence of extensive dental artifact. A 28-year-old female with locally advanced nasopharyngeal carcinoma presented for radiation therapy. Due to the extensiveness of the dental artifact present in the oral cavity kV-CT scan acquired at simulation, which made treatment planning impossible on tomotherapy planning system, MV-FBCT imaging was obtained using the HI-ART tomotherapy treatment machine, with the patient in the treatment position, and this information was registered with her original kV-CT scan for the purposes of structure delineation, dose calculation, and treatment planning. To validate the feasibility of the MV-FBCT-generated treatment plan, an electron density CT phantom (model 465, Gammex Inc., Middleton, WI) was scanned using MV-FBCT to obtain CT number to density table. Additionally, both a 'cheese' phantom (which came with the tomotherapy treatment machine) with 2 inserted ion chambers and a generic phantom called Quasar phantom (Modus Medical Devices Inc., London, ON, Canada) with one inserted chamber were used to confirm dosimetric accuracy. The MV-FBCT could be used to clearly visualize anatomy in the region of the dental artifact and provide sufficient soft-tissue contrast to assist in the delineation of normal tissue structures and fat planes. With the elimination of the dental artifact, the MV-FBCT images allowed more accurate dose calculation by the tomotherapy system. It was confirmed that the phantom material density was determined correctly by the tomotherapy MV-FBCT number to density table. The ion chamber measurements agreed with the calculations from the MV-FBCT generated phantom plan within 2%. MV-FBCT may be useful in radiation treatment planning for nasopharyngeal cancer patients in the setting of extensive dental artifacts.

Yang, Claus; Liu Tianxiao; Jennelle, Richard L.; Ryu, Janice K.; Vijayakumar, Srinivasan; Purdy, James A. [Department of Radiation Oncology, University of California Davis School of Medicine, Sacramento, CA (United States); Chen, Allen M. [Department of Radiation Oncology, University of California Davis School of Medicine, Sacramento, CA (United States)], E-mail: allen.chen@ucdmc.ucdavis.edu

2010-07-01T23:59:59.000Z

402

NJ WY AK AL CA AR CO CT DE FL GA HI ID KS IL IN IA IA KY LA  

Gasoline and Diesel Fuel Update (EIA)

0.00-1.99 0.00-1.99 2.00-2.99 3.00-3.99 4.00-4.99 5.00-5.99 6.00-6.99 7.00+ NJ WY AK AL CA AR CO CT DE FL GA HI ID KS IL IN IA IA KY LA ME MI MA MD MN MS MT MO NE ND OH NV NM NY NH NC OK OR PA RI SC SD TN TX UT VT WA WV WI AZ VA DC 0.00-1.99 2.00-2.99 3.00-3.99 4.00-4.99 5.00-5.99 6.00-6.99 7.00+ 18. Average Price of Natural Gas Delivered to U.S. Onsystem Industrial Consumers, 1996 (Dollars per Thousand Cubic Feet) Figure 19. Average Price of Natural Gas Delivered to U.S. Electric Utilities, 1996 (Dollars per Thousand Cubic Feet) Figure Sources: Federal Energy Regulatory Commission (FERC), Form FERC-423, "Monthly Report of Cost and Quality of Fuels for Electric Plants," and Energy Information Administration (EIA), Form EIA-176, "Annual Report of Natural and Supplemental Gas Supply and Disposition." Note: In 1996, consumption of natural gas for agricultural use

403

CT head-scan dosimetry in an anthropomorphic phantom and associated measurement of ACR accreditation-phantom imaging metrics under clinically representative scan conditions  

SciTech Connect (OSTI)

Purpose: To measure radiation absorbed dose and its distribution in an anthropomorphic head phantom under clinically representative scan conditions in three widely used computed tomography (CT) scanners, and to relate those dose values to metrics such as high-contrast resolution, noise, and contrast-to-noise ratio (CNR) in the American College of Radiology CT accreditation phantom.Methods: By inserting optically stimulated luminescence dosimeters (OSLDs) in the head of an anthropomorphic phantom specially developed for CT dosimetry (University of Florida, Gainesville), we measured dose with three commonly used scanners (GE Discovery CT750 HD, Siemens Definition, Philips Brilliance 64) at two different clinical sites (Walter Reed National Military Medical Center, National Institutes of Health). The scanners were set to operate with the same data-acquisition and image-reconstruction protocols as used clinically for typical head scans, respective of the practices of each facility for each scanner. We also analyzed images of the ACR CT accreditation phantom with the corresponding protocols. While the Siemens Definition and the Philips Brilliance protocols utilized only conventional, filtered back-projection (FBP) image-reconstruction methods, the GE Discovery also employed its particular version of an adaptive statistical iterative reconstruction (ASIR) algorithm that can be blended in desired proportions with the FBP algorithm. We did an objective image-metrics analysis evaluating the modulation transfer function (MTF), noise power spectrum (NPS), and CNR for images reconstructed with FBP. For images reconstructed with ASIR, we only analyzed the CNR, since MTF and NPS results are expected to depend on the object for iterative reconstruction algorithms.Results: The OSLD measurements showed that the Siemens Definition and the Philips Brilliance scanners (located at two different clinical facilities) yield average absorbed doses in tissue of 42.6 and 43.1 mGy, respectively. The GE Discovery delivers about the same amount of dose (43.7 mGy) when run under similar operating and image-reconstruction conditions, i.e., without tube current modulation and ASIR. The image-metrics analysis likewise showed that the MTF, NPS, and CNR associated with the reconstructed images are mutually comparable when the three scanners are run with similar settings, and differences can be attributed to different edge-enhancement properties of the applied reconstruction filters. Moreover, when the GE scanner was operated with the facility's scanner settings for routine head exams, which apply 50% ASIR and use only approximately half of the 100%-FBP dose, the CNR of the images showed no significant change. Even though the CNR alone is not sufficient to characterize the image quality and justify any dose reduction claims, it can be useful as a constancy test metric.Conclusions: This work presents a straightforward method to connect direct measurements of CT dose with objective image metrics such as high-contrast resolution, noise, and CNR. It demonstrates that OSLD measurements in an anthropomorphic head phantom allow a realistic and locally precise estimation of magnitude and spatial distribution of dose in tissue delivered during a typical CT head scan. Additional objective analysis of the images of the ACR accreditation phantom can be used to relate the measured doses to high contrast resolution, noise, and CNR.

Brunner, Claudia C.; Stern, Stanley H.; Chakrabarti, Kish [U.S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, Maryland 20993 (United States)] [U.S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, Maryland 20993 (United States); Minniti, Ronaldo [National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899 (United States)] [National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899 (United States); Parry, Marie I. [Walter Reed National Military Medical Center, 8901 Rockville Pike, Bethesda, Maryland 20889 (United States)] [Walter Reed National Military Medical Center, 8901 Rockville Pike, Bethesda, Maryland 20889 (United States); Skopec, Marlene [National Institutes of Health, 9000 Rockville Pike, Bethesda, Maryland 20892 (United States)] [National Institutes of Health, 9000 Rockville Pike, Bethesda, Maryland 20892 (United States)

2013-08-15T23:59:59.000Z

404

Predicting target vessel location on robot-assisted coronary artery bypass graft using CT to ultrasound registration  

SciTech Connect (OSTI)

Purpose: Although robot-assisted coronary artery bypass grafting (RA-CABG) has gained more acceptance worldwide, its success still depends on the surgeon's experience and expertise, and the conversion rate to full sternotomy is in the order of 15%-25%. One of the reasons for conversion is poor pre-operative planning, which is based solely on pre-operative computed tomography (CT) images. In this paper, the authors propose a technique to estimate the global peri-operative displacement of the heart and to predict the intra-operative target vessel location, validated via both an in vitro and a clinical study. Methods: As the peri-operative heart migration during RA-CABG has never been reported in the literatures, a simple in vitro validation study was conducted using a heart phantom. To mimic the clinical workflow, a pre-operative CT as well as peri-operative ultrasound images at three different stages in the procedure (Stage{sub 0}--following intubation; Stage{sub 1}--following lung deflation; and Stage{sub 2}--following thoracic insufflation) were acquired during the experiment. Following image acquisition, a rigid-body registration using iterative closest point algorithm with the robust estimator was employed to map the pre-operative stage to each of the peri-operative ones, to estimate the heart migration and predict the peri-operative target vessel location. Moreover, a clinical validation of this technique was conducted using offline patient data, where a Monte Carlo simulation was used to overcome the limitations arising due to the invisibility of the target vessel in the peri-operative ultrasound images. Results: For the in vitro study, the computed target registration error (TRE) at Stage{sub 0}, Stage{sub 1}, and Stage{sub 2} was 2.1, 3.3, and 2.6 mm, respectively. According to the offline clinical validation study, the maximum TRE at the left anterior descending (LAD) coronary artery was 4.1 mm at Stage{sub 0}, 5.1 mm at Stage{sub 1}, and 3.4 mm at Stage{sub 2}. Conclusions: The authors proposed a method to measure and validate peri-operative shifts of the heart during RA-CABG. In vitro and clinical validation studies were conducted and yielded a TRE in the order of 5 mm for all cases. As the desired clinical accuracy imposed by this procedure is on the order of one intercostal space (10-15 mm), our technique suits the clinical requirements. The authors therefore believe this technique has the potential to improve the pre-operative planning by updating peri-operative migration patterns of the heart and, consequently, will lead to reduced conversion to conventional open thoracic procedures.

Cho, Daniel S.; Linte, Cristian; Chen, Elvis C. S.; Bainbridge, Daniel; Wedlake, Chris; Moore, John; Barron, John; Patel, Rajni; Peters, Terry [Imaging Research Laboratories, Robarts Research Institute and Biomedical Engineering Graduate Program, University of Western Ontario, Ontario N6A 5K8 (Canada); Imaging Research Laboratories, Robarts Research Institute and Biomedical Imaging Resource, Mayo Clinic, Rochester, Minnesota 55905 (United States); Imaging Research Laboratories, Robarts Research Institute, University of Western Ontario, Ontario N6A 5K8 (Canada); Canadian Surgical Technologies and Advanced Robotics, London, Ontario N6A 5A5 (Canada); Imaging Research Laboratories, Robarts Research Institute, University of Western Ontario, Ontario N6A 5K8 (Canada); Department of Computer Science, University of Western Ontario, Ontario N6A 5B7 (Canada); Canadian Surgical Technologies and Advanced Robotics, London, Ontario N6A 5A5 (Canada); Imaging Research Laboratories, Robarts Research Institute, Biomedical Engineering Graduate Program, University of Western Ontario N6A 5K8 (Canada); and Canadian Surgical Technologies and Advanced Robotics, London, Ontario N6A 5A5 (Canada)

2012-03-15T23:59:59.000Z

405

A Novel Markerless Technique to Evaluate Daily Lung Tumor Motion Based on Conventional Cone-Beam CT Projection Data  

SciTech Connect (OSTI)

Purpose: In this study, we present a novel markerless technique, based on cone beam computed tomography (CBCT) raw projection data, to evaluate lung tumor daily motion. Method and Materials: The markerless technique, which uses raw CBCT projection data and locates tumors directly on every projection, consists of three steps. First, the tumor contour on the planning CT is used to create digitally reconstructed radiographs (DRRs) at every projection angle. Two sets of DRRs are created: one showing only the tumor, and another with the complete anatomy without the tumor. Second, a rigid two-dimensional image registration is performed to register the DRR set without the tumor to the CBCT projections. After the registration, the projections are subtracted from the DRRs, resulting in a projection dataset containing primarily tumor. Finally, a second registration is performed between the subtracted projection and tumor-only DRR. The methodology was evaluated using a chest phantom containing a moving tumor, and retrospectively in 4 lung cancer patients treated by stereotactic body radiation therapy. Tumors detected on projection images were compared with those from three-dimensional (3D) and four-dimensional (4D) CBCT reconstruction results. Results: Results in both static and moving phantoms demonstrate that the accuracy is within 1 mm. The subsequent application to 22 sets of CBCT scan raw projection data of 4 lung cancer patients includes about 11,000 projections, with the detected tumor locations consistent with 3D and 4D CBCT reconstruction results. This technique reveals detailed lung tumor motion and provides additional information than conventional 4D images. Conclusion: This technique is capable of accurately characterizing lung tumor motion on a daily basis based on a conventional CBCT scan. It provides daily verification of the tumor motion to ensure that these motions are within prior estimation and covered by the treatment planning volume.

Yang Yin; Zhong Zichun; Guo Xiaohu [Department of Computer Science, University of Texas at Dallas, Richardson, TX (United States); Wang Jing; Anderson, John; Solberg, Timothy [Department of Radiation Oncology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390 (United States); Mao Weihua, E-mail: weihua.mao@utsouthwestern.edu [Department of Radiation Oncology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390 (United States)

2012-04-01T23:59:59.000Z

406

Quantitative CT of lung nodules: Dependence of calibration on patient body size, anatomic region, and calibration nodule size for single- and dual-energy techniques  

SciTech Connect (OSTI)

Calcium concentration may be a useful feature for distinguishing benign from malignant lung nodules in computer-aided diagnosis. The calcium concentration can be estimated from the measured CT number of the nodule and a CT number vs calcium concentration calibration line that is derived from CT scans of two or more calcium reference standards. To account for CT number nonuniformity in the reconstruction field, such calibration lines may be obtained at multiple locations within lung regions in an anthropomorphic phantom. The authors performed a study to investigate the effects of patient body size, anatomic region, and calibration nodule size on the derived calibration lines at ten lung region positions using both single energy (SE) and dual energy (DE) CT techniques. Simulated spherical lung nodules of two concentrations (50 and 100 mg/cc CaCO{sub 3}) were employed. Nodules of three different diameters (4.8, 9.5, and 16 mm) were scanned in a simulated thorax section representing the middle of the chest with large lung regions. The 4.8 and 9.5 mm nodules were also scanned in a section representing the upper chest with smaller lung regions. Fat rings were added to the peripheries of the phantoms to simulate larger patients. Scans were acquired on a GE-VCT scanner at 80, 120, and 140 kVp and were repeated three times for each condition. The average absolute CT number separations between the calibration lines were computed. In addition, under- or overestimates were determined when the calibration lines for one condition (e.g., small patient) were used to estimate the CaCO{sub 3} concentrations of nodules for a different condition (e.g., large patient). The authors demonstrated that, in general, DE is a more accurate method for estimating the calcium contents of lung nodules. The DE calibration lines within the lung field were less affected by patient body size, calibration nodule size, and nodule position than the SE calibration lines. Under- or overestimates in CaCO{sub 3} concentrations of nodules were also in general smaller in quantity with DE than with SE. However, because the slopes of the calibration lines for DE were about one-half the slopes for SE, the relative improvement in the concentration estimates for DE as compared to SE was about one-half the relative improvement in the separation between the calibration lines. Results in the middle of the chest thorax section with large lungs were nearly completely consistent with the above generalization. On the other hand, results in the upper-chest thorax section with smaller lungs and greater amounts of muscle and bone were mixed. A repeat of the entire study in the upper thorax section yielded similar mixed results. Most of the inconsistencies occurred for the 4.8 mm nodules and may be attributed to errors caused by beam hardening, volume averaging, and insufficient sampling. Targeted, higher resolution reconstructions of the smaller nodules, application of high atomic number filters to the high energy x-ray beam for improved spectral separation, and other future developments in DECT may alleviate these problems and further substantiate the superior accuracy of DECT in quantifying the calcium concentrations of lung nodules.

Goodsitt, Mitchell M.; Chan, Heang-Ping; Way, Ted W.; Schipper, Mathew J.; Larson, Sandra C.; Christodoulou, Emmanuel G. [Department of Radiology, University of Michigan, Ann Arbor, Michigan 48109-5842 (United States)

2009-07-15T23:59:59.000Z

407

MO?F?213CD?02: A Series of NURBS and MicroCT?Based Reference Skeletal Dosimetry Models of Pediatric and Adolescent Skeleton  

Science Journals Connector (OSTI)

Purpose: The hematopoietically active tissues of the skeleton are an important target tissue for dosimetric analysis both in terms of diagnostic risk optimization and evaluating treatment efficacy. In the work presented here a recently published dosimetry model of the adult is extended to all pediatric ages of the ICRP reference series. Methods: NURBS/PM?based computational phantoms of the ICRP 89 reference newborn 1?year 5?year 10?year and 15?year male and female were constructed from image segmentation of age and gender?matched CTimages. Bone samples were subsequently acquired from autopsy harvest of two female newborns and one 18?year male subject. Individual bones were collected and segmented following high?resolution ex?vivo CT to yield fractional volumes of cortical bone and spongiosa. Cored samples of spongiosa were later imaged under microCT to yield fractional volumes of bone trabeculae and marrow tissues and to provide a 3D geometry for radiation transport. Previously acquired pathlength distributions of trabecular spongiosa for a 1.7?year and 9?year child were used to supplement the dataset. Results: A comprehensive set of absorbed fractions of energy for internally emitted electrons are presented for active and shallow marrow targets in all bones all ages and over the energies 1 keV to 10 MeV. These electron absorbed fractions were then used to assemble photon fluence?to?dose response functions permitting detailed marrow dosimetry for both externally incident (e.g. CT) and internally emitted (e.g. nuclear medicine)photons by bone site and subject age. Techniques and issues for patient?specific adjustments are discussed. Conclusions: Marrow dosimetry is a critical component to nuclear medicine risk assessment and therapy treatment planning. This work provides state?of?the?art methods for pediatric marrow dosimetry that supplants those developed previously for simpler stylized models of the pediatric skeleton. R01 CA116743 R01 CA96441 DE?FG07?06ID14773

W Bolch; D Pafundi; M Wayson; C Lee; C Watchman

2012-01-01T23:59:59.000Z

408

Comparison of Planned Versus Actual Dose Delivered for External Beam Accelerated Partial Breast Irradiation Using Cone-Beam CT and Deformable Registration  

SciTech Connect (OSTI)

Purpose: To assess the adequacy of dose delivery to the clinical target volume (CTV) using external beam (EB) accelerated partial breast irradiation (APBI). Methods and Materials: Sixteen patients treated with EB APBI underwent cone beam CT (CBCT) before each fraction and daily helical CT (HCT) scans to determine setup errors and calculate the dose per fraction. For 12 patients, an in-house image-intensity-based deformable registration program was used to register the HCTs to the planning CT and generate the cumulative dose. Treatment was 38.5 Gy in 10 fractions. EB APBI constraints from the National Surgical Adjuvant Breast and Bowel Project B39/Radiation Therapy Oncology Group 0413 Phase III protocol were used. Results: The mean setup error per CBCT registration was 9 {+-} 5 mm. Dose-volume histogram analysis showed only one patient (8%) with a decrease in the CTV V90 (8% underdosage). All other patients demonstrated adequate target coverage. PTV{sub E}VAL V90 was on average 3% (range, 0%-16%) less than planned. For the ipsilateral breast, four patients had an increase in V50 ({<=}1% increase) and three patients had an increase in V100 ({<=}9% increase). Only one patient showed an increase >5%. Four patients had an increase in ipsilateral lung V30 (maximum 3%), and one had an increase in heart V5 (1%). Four patients had an increase in MaxDose (maximum 89 cGy). Conclusions: The current CTV-to-PTV margin of 10 mm appears sufficient for {approx}92% of patients treated with EB APBI. Although expansion of the population PTV margin to 14 mm would provide {approx}97% confidence level for CTV coverage, online image guidance should be considered.

Hasan, Yasmin; Kim, Leonard; Wloch, Jennifer; Chi, Y.; Liang, J.; Martinez, Alvaro; Yan Di [Department of Radiation Oncology, William Beaumont Hospital, Royal Oak, MI (United States); Vicini, Frank, E-mail: fvicini@beaumont.edu [Department of Radiation Oncology, William Beaumont Hospital, Royal Oak, MI (United States)

2011-08-01T23:59:59.000Z

409

CT Clean Energy Communities  

Broader source: Energy.gov [DOE]

The Clean Energy Communities program, offered by the Clean Energy Finance & Investment Authority and the Connecticut Energy Efficiency Fund, offers incentives for communities that pledge their...

410

Semiautomatic technique for defining the internal gross tumor volume of lung tumors close to liver/spleen cupola by 4D-CT  

SciTech Connect (OSTI)

Purpose: It has been shown that in cases of lung tumors close to the liver cupola, the four dimensional (4D)-CT postprocessing maximum intensity projection (MIP) algorithm does not fully recover the radiotherapy internal gross tumor volume (IGTV). In this work, a semiautomatic technique was evaluated by which the residual IGTV that was not included into the IGTV by MIP algorithm was actually added. Methods: A moving phantom and five selected patients were considered. The various IGTVs produced by the semiautomatic approach were compared to those generated by 4D-CT manual contouring. Results: In all cases, the radiation oncologist qualitatively concurred with the semiautomatic IGTV. A quantitative difference in volume of 2.6% was found in the phantom study, whereas a mean difference of 0.1{+-}4.6% was obtained in the patient studies. Conclusions: A semiautomatic technique to include the residual part of IGTV covered by liver/spleen cupola when using MIP algorithm was validated on phantom and on selected patients, revealing the possibility of defining the IGTV for patients with lesions located near liver/spleen cupola by performing only the contours on the MIP series.

Mancosu, Pietro; Sghedoni, Roberto; Bettinardi, Valentino; Aquilina, Mark Anthony; Navarria, Piera; Cattaneo, Giovanni Mauro; Di Muzio, Nadia; Cozzi, Luca; Scorsetti, Marta [Department of Radiotherapy, IRCCS Istituto Clinico Humanitas, Rozzano, 20089 Milano (Italy); Department of Medical Physics, Arcispedale S. Maria Nuova, Reggio, 42100 Emilia (Italy); Department of Nuclear Medicine, Scientific Institute H. S. Raffaele, 20089 Milan (Italy); Department of Radiotherapy, IRCCS Istituto Clinico Humanitas, 20089 Rozzano, Milano (Italy); Department of Medical Physics, San Raffaele Scientific Institute, 20133 Milan (Italy); Department of Radiotherapy, San Raffaele Scientific Institute, 20133 Milan (Italy); Medical Physics Unit, Oncology Institute of Southern Switzerland, 6504 Bellinzona (Switzerland); Department of Radiotherapy, IRCCS Istituto Clinico Humanitas, 20089 Rozzano, Milano (Italy)

2010-09-15T23:59:59.000Z

411

Rapid, automated imaging of mouse articular cartilage by microCT for early detection of osteoarthritis and finite element modelling of joint mechanics  

Science Journals Connector (OSTI)

SummaryObjective Mouse articular cartilage (AC) is mostly assessed by histopathology and its mechanics is poorly characterised. In this study: (1) we developed non-destructive imaging for quantitative assessment of AC morphology and (2) evaluated the mechanical implications of AC structural changes. Methods Knee joints obtained from naïve mice and from mice with osteoarthritis (OA) induced by destabilization of medial meniscus (DMM) for 4 and 12 weeks, were imaged by phosphotungstic acid (PTA) contrast enhanced micro-computed tomography (PTA-CT) and scored by conventional histopathology. Our software (Matlab) automatically segmented tibial AC, drew two regions centred on each tibial condyle and evaluated the volumes included. A finite element (FE) model of the whole mouse joint was implemented to evaluate AC mechanics. Results Our method achieved rapid, automated analysis of mouse AC (structural parameters in simulations estimated that AC thinning at early-stages in the DMM model (4 weeks) increases contact pressures (+39%) and Tresca stresses (+43%) in AC. Conclusion PTA-CT imaging is a fast and simple method to assess OA in murine models. Once applied more extensively to confirm its robustness, our approach will be useful for rapidly phenotyping genetically modified mice used for OA research and to improve the current understanding of mouse cartilage mechanics.

P. Das Neves Borges; A.E. Forte; T.L. Vincent; D. Dini; M. Marenzana

2014-01-01T23:59:59.000Z

412

Validity of Fusion Imaging of Hamster Heart obtained by Fluorescent and Phase-Contrast X-Ray CT with Synchrotron Radiation  

SciTech Connect (OSTI)

Fluorescent X-ray CT (FXCT) to depict functional information and phase-contrast X-ray CT (PCCT) to demonstrate morphological information are being developed to analyze the disease model of small animal. To understand the detailed pathological state, integration of both functional and morphological image is very useful. The feasibility of image fusion between FXCT and PCCT were examined by using ex-vivo hearts injected fatty acid metabolic agent (127I-BMIPP) in normal and cardiomyopathic hamsters. Fusion images were reconstructed from each 3D image of FXCT and PCCT. 127I-BMIPP distribution within the heart was clearly demonstrated by FXCT with 0.25 mm spatial resolution. The detailed morphological image was obtained by PCCT at about 0.03 mm spatial resolution. Using image integration technique, metabolic abnormality of fatty acid in cardiomyopathic myocardium was easily recognized corresponding to anatomical structures. Our study suggests that image fusion provides important biomedical information even in FXCT and PCCT imaging.

Wu, J.; Takeda, T.; Lwin, Thet Thet; Huo, Q.; Minami, M. [Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8575 (Japan); Sunaguchi, N.; Murakami, T.; Mouri, S.; Nasukawa, S.; Fukami, T.; Yuasa, T.; Akatsuka, T. [Faculty of Engineering, Yamagata University, Yonezawa, Yamagata 992-8510 (Japan); Hyodo, K. [Institute of Material Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801 (Japan); Hontani, H. [Department of Computer Science and Engineering, Nagoya Institute of Technology, Nagoya, Aichi 466-8555 (Japan)

2007-01-19T23:59:59.000Z

413

A Comparative Analysis of the Supernova Legacy Survey Sample with {\\Lambda}CDM and the $R_{\\rm h}=ct$ Universe  

E-Print Network [OSTI]

The use of Type~Ia SNe has thus far produced the most reliable measurement of the expansion history of the Universe, suggesting that $\\Lambda$CDM offers the best explanation for the redshift--luminosity distribution observed in these events. But the analysis of other kinds of source, such as cosmic chronometers, gamma ray bursts, and high-$z$ quasars, conflicts with this conclusion, indicating instead that the constant expansion rate implied by the $R_{\\rm h}=ct$ Universe is a better fit to the data. The central difficulty with the use of Type~Ia SNe as standard candles is that one must optimize three or four nuisance parameters characterizing supernova luminosities simultaneously with the parameters of an expansion model. Hence in comparing competing models, one must reduce the data independently for each. We carry~out such a comparison of $\\Lambda$CDM and the $R_{\\rm h}=ct$ Universe, using the Supernova Legacy Survey (SNLS) sample of 252 SN~events, and show that each model fits its individually reduced data...

Wei, Jun-Jie; Melia, Fulvio; Maier, Robert S

2015-01-01T23:59:59.000Z

414

Computerized method for evaluating diagnostic image quality of calcified plaque images in cardiac CT: Validation on a physical dynamic cardiac phantom  

SciTech Connect (OSTI)

Purpose: In cardiac computed tomography (CT), important clinical indices, such as the coronary calcium score and the percentage of coronary artery stenosis, are often adversely affected by motion artifacts. As a result, the expert observer must decide whether or not to use these indices during image interpretation. Computerized methods potentially can be used to assist in these decisions. In a previous study, an artificial neural network (ANN) regression model provided assessability (image quality) indices of calcified plaque images from the software NCAT phantom that were highly agreeable with those provided by expert observers. The method predicted assessability indices based on computer-extracted features of the plaque. In the current study, the ANN-predicted assessability indices were used to identify calcified plaque images with diagnostic calcium scores (based on mass) from a physical dynamic cardiac phantom. The basic assumption was that better quality images were associated with more accurate calcium scores. Methods: A 64-channel CT scanner was used to obtain 500 calcified plaque images from a physical dynamic cardiac phantom at different heart rates, cardiac phases, and plaque locations. Two expert observers independently provided separate sets of assessability indices for each of these images. Separate sets of ANN-predicted assessability indices tailored to each observer were then generated within the framework of a bootstrap resampling scheme. For each resampling iteration, the absolute calcium score error between the calcium scores of the motion-contaminated plaque image and its corresponding stationary image served as the ground truth in terms of indicating images with diagnostic calcium scores. The performances of the ANN-predicted and observer-assigned indices in identifying images with diagnostic calcium scores were then evaluated using ROC analysis. Results: Assessability indices provided by the first observer and the corresponding ANN performed similarly (AUC{sub OBS1}=0.80 [0.73,0.86] vs AUC{sub ANN1}=0.88 [0.82,0.92]) as that of the second observer and the corresponding ANN (AUC{sub OBS2}=0.87 [0.83,0.91] vs AUC{sub ANN2}=0.90 [0.85,0.94]). Moreover, the ANN-predicted indices were generated in a fraction of the time required to obtain the observer-assigned indices. Conclusions: ANN-predicted assessability indices performed similar to observer-assigned assessability indices in identifying images with diagnostic calcium scores from the physical dynamic cardiac phantom. The results of this study demonstrate the potential of using computerized methods for identifying images with diagnostic clinical indices in cardiac CT images.

King, Martin; Rodgers, Zachary; Giger, Maryellen L.; Bardo, Dianna M. E.; Patel, Amit R. [Department of Radiology, Committee on Medical Physics, University of Chicago, 5841 South Maryland Avenue, MC 2026, Chicago, Illinois 60637 (United States); Department of Diagnostic Radiology, Oregon Health and Science University, 3181 Southwest Sam Jackson Park Road, Portland, Oregon 97239 (United States); Department of Medicine, University of Chicago, 5841 South Maryland Avenue, MC 5084, Chicago, Illinois 60637 (United States)

2010-11-15T23:59:59.000Z

415

Assessment of dedicated low-dose cardiac micro-CT reconstruction algorithms using the left ventricular volume of small rodents as a performance measure  

SciTech Connect (OSTI)

Purpose: Phase-correlated microcomputed tomography (micro-CT) imaging plays an important role in the assessment of mouse models of cardiovascular diseases and the determination of functional parameters as the left ventricular volume. As the current gold standard, the phase-correlated Feldkamp reconstruction (PCF), shows poor performance in case of low dose scans, more sophisticated reconstruction algorithms have been proposed to enable low-dose imaging. In this study, the authors focus on the McKinnon-Bates (MKB) algorithm, the low dose phase-correlated (LDPC) reconstruction, and the high-dimensional total variation minimization reconstruction (HDTV) and investigate their potential to accurately determine the left ventricular volume at different dose levels from 50 to 500 mGy. The results were verified in phantom studies of a five-dimensional (5D) mathematical mouse phantom. Methods: Micro-CT data of eight mice, each administered with an x-ray dose of 500 mGy, were acquired, retrospectively gated for cardiac and respiratory motion and reconstructed using PCF, MKB, LDPC, and HDTV. Dose levels down to 50 mGy were simulated by using only a fraction of the projections. Contrast-to-noise ratio (CNR) was evaluated as a measure of image quality. Left ventricular volume was determined using different segmentation algorithms (Otsu, level sets, region growing). Forward projections of the 5D mouse phantom were performed to simulate a micro-CT scan. The simulated data were processed the same way as the real mouse data sets. Results: Compared to the conventional PCF reconstruction, the MKB, LDPC, and HDTV algorithm yield images of increased quality in terms of CNR. While the MKB reconstruction only provides small improvements, a significant increase of the CNR is observed in LDPC and HDTV reconstructions. The phantom studies demonstrate that left ventricular volumes can be determined accurately at 500 mGy. For lower dose levels which were simulated for real mouse data sets, the HDTV algorithm shows the best performance. At 50 mGy, the deviation from the reference obtained at 500 mGy were less than 4%. Also the LDPC algorithm provides reasonable results with deviation less than 10% at 50 mGy while PCF and MKB reconstruction show larger deviations even at higher dose levels. Conclusions: LDPC and HDTV increase CNR and allow for quantitative evaluations even at dose levels as low as 50 mGy. The left ventricular volumes exemplarily illustrate that cardiac parameters can be accurately estimated at lowest dose levels if sophisticated algorithms are used. This allows to reduce dose by a factor of 10 compared to today's gold standard and opens new options for longitudinal studies of the heart.

Maier, Joscha, E-mail: joscha.maier@dkfz.de [Medical Physics in Radiology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg (Germany)] [Medical Physics in Radiology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg (Germany); Sawall, Stefan; Kachelrieß, Marc [Medical Physics in Radiology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany and Institute of Medical Physics, University of Erlangen–Nürnberg, 91052 Erlangen (Germany)] [Medical Physics in Radiology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany and Institute of Medical Physics, University of Erlangen–Nürnberg, 91052 Erlangen (Germany)

2014-05-15T23:59:59.000Z

416

Novel Carbon Monoxide Sensor for PEM Fuel Cell Systems C.T. Holt, A.-M. Azad, S.L. Swartz, W.J. Dawson, and P.K. Dutta  

E-Print Network [OSTI]

Novel Carbon Monoxide Sensor for PEM Fuel Cell Systems C.T. Holt, A.-M. Azad, S.L. Swartz, W The importance of carbon monoxide sensors for automotive PEM fuel cell systems is illustrated by a schematic will protect the PEM fuel cell stack; detection of CO is extremely important because too much CO will poison

Azad, Abdul-Majeed

417

Tri-County Electric Coop | Open Energy Information  

Open Energy Info (EERE)

Coop Coop Place Minnesota Utility Id 19157 Utility Location Yes Ownership C NERC Location MRO NERC MRO Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Are Lighting - 150W HPS Unmetered Lighting Area Lighting - 100W HPS Unmetered Lighting City Service (multi-phase) Commercial City Service (single-phase) Residential Industrial Service (multi-phase) Industrial Interruptible Heating - Multiphase Commercial Interruptible Heating - Single Phase Residential Large Commercial Service - Multiphase Industrial Large Commercial Service - Single Phase Industrial

418

TriEagle Energy, LLC | Open Energy Information  

Open Energy Info (EERE)

Id 19126 Utility Location Yes Ownership R NERC Location TRE NERC ERCOT Yes Activity Retail Marketing Yes This article is a stub. You can help OpenEI by expanding it. Utility...

419

Composite event management in TriGS — Concepts and implementation  

Science Journals Connector (OSTI)

Active object-oriented database systems are a commonly accepted solution for capturing the time- and context-dependent knowledge of non-standard applications. Several attempts have been made already to integra...

Werner Retschitzegger

1998-01-01T23:59:59.000Z

420

TRI-PARTY AGREEMENT OPERABLE UNITS PROJECT MANAGERS LIST AS...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Building and nearby) 1100-EM-3 Einan, D.R. Menard, N. Hathaway, H.B Flynn, K.L. EPA CPP 3000 Area 1100-IU-1 Einan, D.R. Menard, N. Hathaway, H.B Flynn, K.L. EPA CPP ALE 3 of 3...

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421

Math 741 Final RULES. Try to write efficiently and succinctly.  

E-Print Network [OSTI]

is essential in V , and write W ess V , if W X = 0 for all nonzero submodules X of V . 1. If W ess V and U is a submodule of V , prove that (W U) ess U. 2. If W1 and W2 are essential in V , show that (W1 W2) ess V . 3. Suppose W is a submodule of V . Prove that there exists a submodule W of V such that (W W ) ess V . 4

Passman, Donald S.

422

Tri-National Agricultural Accord Rural Development Workshop  

E-Print Network [OSTI]

: Infrastructure Human resource development Investment attraction Entrepreneurship / SMEs Community for integrated approach: infrastructure, diversification, human resources, health, services, technology

deYoung, Brad

423

Examination of Hydrate Formation Methods: Trying to Create Representative Samples  

E-Print Network [OSTI]

gas hydrate morphology on the seismic velocities of sands,sand does not distribute water and gas evenly. Resultant hydrateHydrate Using Excess Gas Method Followed by Water Saturation Description In this method, moist sand

Kneafsey, T.J.

2012-01-01T23:59:59.000Z

424

New ideas, tried-and-true methods boost cleaning efficiency  

SciTech Connect (OSTI)

Process cleaning can cut needed operating time and add to plant waste treatment and/or disposal requirements. Whether a plant takes a clean-in-place (CIP) or an open-and-clean approach, the choice of cleaning materials is important. Cleaning agents must be compatible with the process and equipment and ideally will have no adverse environmental impact. This article describes merits of three cleaning methods: CO[sub 2] as an industrial cleaner; water blasting with soluble polymers; and post-job cleanup with a water-soluble abrasive.

Hodel, A.E.

1993-03-01T23:59:59.000Z

425

Characterization of the Tri10 gene from Fusarium sporotrichioides  

E-Print Network [OSTI]

?????????????????????????????... 133 x LIST OF FIGURES FIGURE age 1-1 Selected trichothecene structures ........................................?.......4 1-2 Proposed trichothecene biosynthetic pathway for Fusarium sporotrichioides NRRL 3299 leading... biosynthetic pathway has been obtained from studies on trichothecene production in F. sporotrichioides. The trichothecene biosynthetic pathway has been elucidated in F. sporotrichioides NRRL 3299 using a variety of approaches including analysis of blocked...

Tag, Andrew George

2004-09-30T23:59:59.000Z

426

National High Magnetic Field Laboratory - Try This at Home  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

fun and most can be done with stuff you have around the house. Create your own magnetic field lines, expose the iron in your cereal, or make an electromagnet from scratch Your...

427

Tri-Party Agreement for Energy Savings Performance Contract ...  

Broader source: Energy.gov (indexed) [DOE]

and maintenance-specific, as well agency responsibilities. The (Agency name) will be contracting for energy services with (ESCO) under a First Task Order for and ESPC Project at...

428

Covalently linked tri and tetra compounds: Intriguing optical properties and  

E-Print Network [OSTI]

interconnections are realized using integrated optoelectronic devices operating at wavelengths to which silicon silicon circuits. The thin film optoelectronic devices are bonded directly to the stacked layers. devices. These optoelectronic devices operate at wavelengths to which the silicon is transparent, thus

Shyamasundar, R.K.

429

Tri-Party Agreement for Energy Savings Performance Contract ...  

Broader source: Energy.gov (indexed) [DOE]

maintenance-specific, as well agency responsibilities. The Department of Energy National Nuclear Security Administration (DOENNSA) will be contracting for energy services with...

430

Emotionally Contentious Social Movements: A Tri-Variate Framework  

E-Print Network [OSTI]

such as the deranged Colonel Sanders, pathological Ronald McDonald or wicked Wendy are signifiers to the abominable atrocities inflicted upon these animals used as economic resources in the fast food industries. The Figure 3 Social Thought & Research 98 aim... know. People can support bringing animals out of labs, but they can’t support arson. Well, I’m sorry. I’m not here to, to please people. I’m not here to win the support of people. I’m here to represent my animal relations who are suffering this very...

Sin, Ray

2009-01-01T23:59:59.000Z

431

Quantum Mechanics of a Simulated Tri-hydrogen Dication  

E-Print Network [OSTI]

The Schroedinger equation is solved exactly within the Born-Oppenheimer approximation for a simulacrum of the $H_3^{++}$-ion. The ion is assumed to form an isosceles triangle and the ground state energy is obtained over its geometrical parameter space. No multi-center molecular integrations are required. We indicate how the approximation to the actual molecule can be improved systematically.

M. L. Glasser

2014-03-11T23:59:59.000Z

432

TRI-PARTY AGREEMENT HANFORD PUBLIC INVOLVEMENT PLAN  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

programsnwpPIpdfTPAPICalendar.pdf. 4.3 Webinar Feedback 13. Paul Randall, Minnesota Comment A: Yeah, I'm Paul Randall. I happen to live in Minnesota. So I'm the guy...

433

The surface coating industries try on new coats  

SciTech Connect (OSTI)

Some of the best pollution prevention information is available from state industry-education projects. The preferred pollution prevention method is eliminating or reducing the need for surface coating, often by using coating-free materials such as titanium and aluminum alloys, pultruded fiberglass reinforced plastics and weathering steel. Although it is not feasible to completely eliminate coatings for many applications, the need for coating surfaces often can be minimized by preventing deterioration of the coating. Since surface coatings do not deteriorate uniformly or completely, only small portions of a surface may require recoating. Commercially available alternative coating systems that generate fewer air emissions can be applied in specific applications, although there are inevitable trade-offs. In addition, emerging technologies may offer alternatives to traditional coating systems.

NONE

1995-02-01T23:59:59.000Z

434

Tri-Lab Directors' statement on the nuclear posture review  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

necessary technical flexibility to manage the nuclear stockpile into the future with an acceptable level of risk. We are reassured that a key component of the NPR is the...

435

Motions of Molecules in Liquids: Viscosity and Diffusivity  

Science Journals Connector (OSTI)

...and "cages" in which a molecule is "oscillating" with a definite frequency while awaiting...dis-tance between the two ends of a string, say 100 feet long, after gathering...try to solve the problem of the ball of string. To start something that tempts others...

Joel H. Hildebrand

1971-10-29T23:59:59.000Z

436

Fiducial marker-based correction for involuntary motion in weight-bearing C-arm CT scanning of knees. II. Experiment  

SciTech Connect (OSTI)

Purpose: A C-arm CT system has been shown to be capable of scanning a single cadaver leg under loaded conditions by virtue of its highly flexible acquisition trajectories. In Part I of this study, using the 4D XCAT-based numerical simulation, the authors predicted that the involuntary motion in the lower body of subjects in weight-bearing positions would seriously degrade image quality and the authors suggested three motion compensation methods by which the reconstructions could be corrected to provide diagnostic image quality. Here, the authors demonstrate that a flat-panel angiography system is appropriate for scanning both legs of subjectsin vivo under weight-bearing conditions and further evaluate the three motion-correction algorithms using in vivo data. Methods: The geometry of a C-arm CT system for a horizontal scan trajectory was calibrated using the PDS-2 phantom. The authors acquired images of two healthy volunteers while lying supine on a table, standing, and squatting at several knee flexion angles. In order to identify the involuntary motion of the lower body, nine 1-mm-diameter tantalum fiducial markers were attached around the knee. The static mean marker position in 3D, a reference for motion compensation, was estimated by back-projecting detected markers in multiple projections using calibrated projection matrices and identifying the intersection points in 3D of the back-projected rays. Motion was corrected using three different methods (described in detail previously): (1) 2D projection shifting, (2) 2D deformable projection warping, and (3) 3D rigid body warping. For quantitative image quality analysis, SSIM indices for the three methods were compared using the supine data as a ground truth. Results: A 2D Euclidean distance-based metric of subjects’ motion ranged from 0.85 mm (±0.49 mm) to 3.82 mm (±2.91 mm) (corresponding to 2.76 to 12.41 pixels) resulting in severe motion artifacts in 3D reconstructions. Shifting in 2D, 2D warping, and 3D warping improved the SSIM in the central slice by 20.22%, 16.83%, and 25.77% in the data with the largest motion among the five datasets (SCAN5); improvement in off-center slices was 18.94%, 29.14%, and 36.08%, respectively. Conclusions: The authors showed that C-arm CT control can be implemented for nonstandard horizontal trajectories which enabled us to scan and successfully reconstruct both legs of volunteers in weight-bearing positions. As predicted using theoretical models, the proposed motion correction methods improved image quality by reducing motion artifacts in reconstructions; 3D warping performed better than the 2D methods, especially in off-center slices.

Choi, Jang-Hwan [Department of Radiology, Stanford University, Stanford, California 94305 and Department of Mechanical Engineering, Stanford University, Stanford, California 94305 (United States)] [Department of Radiology, Stanford University, Stanford, California 94305 and Department of Mechanical Engineering, Stanford University, Stanford, California 94305 (United States); Maier, Andreas; Keil, Andreas; McWalter, Emily J.; Gold, Garry E.; Fahrig, Rebecca [Department of Radiology, Stanford University, Stanford, California 94305 (United States)] [Department of Radiology, Stanford University, Stanford, California 94305 (United States); Pal, Saikat [Biomedical Engineering Department, California Polytechnic State University, San Luis Obispo, California 93407 (United States)] [Biomedical Engineering Department, California Polytechnic State University, San Luis Obispo, California 93407 (United States); Beaupré, Gary S. [Musculoskeletal Research Laboratory, VA Palo Alto Health Care System, Palo Alto, California 94304 (United States)] [Musculoskeletal Research Laboratory, VA Palo Alto Health Care System, Palo Alto, California 94304 (United States)

2014-06-15T23:59:59.000Z

437

Auto-segmentation of normal and target structures in head and neck CT images: A feature-driven model-based approach  

SciTech Connect (OSTI)

Purpose: Intensity modulated radiation therapy (IMRT) allows greater control over dose distribution, which leads to a decrease in radiation related toxicity. IMRT, however, requires precise and accurate delineation of the organs at risk and target volumes. Manual delineation is tedious and suffers from both interobserver and intraobserver variability. State of the art auto-segmentation methods are either atlas-based, model-based or hybrid however, robust fully automated segmentation is often difficult due to the insufficient discriminative information provided by standard medical imaging modalities for certain tissue types. In this paper, the authors present a fully automated hybrid approach which combines deformable registration with the model-based approach to accurately segment normal and target tissues from head and neck CT images. Methods: The segmentation process starts by using an average atlas to reliably identify salient landmarks in the patient image. The relationship between these landmarks and the reference dataset serves to guide a deformable registration algorithm, which allows for a close initialization of a set of organ-specific deformable models in the patient image, ensuring their robust adaptation to the boundaries of the structures. Finally, the models are automatically fine adjusted by our boundary refinement approach which attempts to model the uncertainty in model adaptation using a probabilistic mask. This uncertainty is subsequently resolved by voxel classification based on local low-level organ-specific features. Results: To quantitatively evaluate the method, they auto-segment several organs at risk and target tissues from 10 head and neck CT images. They compare the segmentations to the manual delineations outlined by the expert. The evaluation is carried out by estimating two common quantitative measures on 10 datasets: volume overlap fraction or the Dice similarity coefficient (DSC), and a geometrical metric, the median symmetric Hausdorff distance (HD), which is evaluated slice-wise. They achieve an average overlap of 93% for the mandible, 91% for the brainstem, 83% for the parotids, 83% for the submandibular glands, and 74% for the lymph node levels. Conclusions: Our automated segmentation framework is able to segment anatomy in the head and neck region with high accuracy within a clinically-acceptable segmentation time.

Qazi, Arish A.; Pekar, Vladimir; Kim, John; Xie, Jason; Breen, Stephen L.; Jaffray, David A. [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario M5G 2M9 (Canada); Philips Research North America, Markham, Ontario L6C 2S3 (Canada); Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario M5G 2M9 (Canada)

2011-11-15T23:59:59.000Z

438

Renormalization of two-dimensional Ising systems with irrelevant, marginal and relevant aperiodic (dis)order  

E-Print Network [OSTI]

Renormalization of two-dimensional Ising systems with irrelevant, marginal and relevant aperiodic Morgenstelle 14, D-72076 Tubingen, Germany Abstract We introduce a class of 2d Ising models with aperiodic: quasicrystals, aperiodic order, renormalization group, Ising spin systems 1. Introduction One important question

Baake, Michael

439

Dis-harmony in European Natural Gas Market(s)—Discussion of Standards and Definitions  

Science Journals Connector (OSTI)

All member states of the European Union with the exception of those who have no natural gas consumption at all (i.e. Malta and Cyprus) and those who do not have a...

Peter Drasdo; Michael Karasz; Andrej Pustisek

2013-06-01T23:59:59.000Z

440

Measurement of Exclusive production in DIS at HERA with the ZEUS Detector  

E-Print Network [OSTI]

large theoretical activity. This work has an ambition to provide experimental data that map inelastic scattering . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 High energy particle identification . . . . . . . . . . . . . . . . . . . . . . 31 4.3.2 Electron energy measurement

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441

L’Italia agra delle antilingue: forme della dis-integrazione nella narrativa di Luciano Bianciardi  

E-Print Network [OSTI]

SANTINI 15. Cfr. Tullio De Mauro, Storia linguistica dell’perfettamente illustrate da De Mauro nelle prime pagine

Santini, Wanda

2012-01-01T23:59:59.000Z

442

In 1896, only one year after German physicist Wilhem Conrad Roentgen dis-  

E-Print Network [OSTI]

and hos- pital residents. Digital radiology has moved dental imaging forward rapidly, most recently early years, radiology generat- ed many two-dimensional imaging tech- niques. Then, in the second half is creating a new rela- tionship between dental surgeons and radiologists. Columbia's College of Dental

Grishok, Alla

443

82 MRS BULLETIN/FEBRUARY 2004 Colloids are small solid particles dis-  

E-Print Network [OSTI]

scientific inter- est, motivated not only by their technologi- cal applications but also by their potential of the colloidal suspension to the ap- plication of relatively large forces by means of electric and magnetic effects. One is struck by the variety of interactions and the range of effects that can be harnessed

444

he invention of a totally dis-crete model for natural phenom-  

E-Print Network [OSTI]

Neu- mann had designed the architecture for the first serial digital computers contain- ing stored form, using finite difference tech- niques and their variants, serial digital computers can solve is an approach to computing fluid dynamics that is still in its infancy. In this three-purr article one

445

Measurement of (anti)deuteron and (anti)proton production in DIS at HERA  

E-Print Network [OSTI]

The first observation of (anti)deuterons in deep inelastic scattering at HERA has been made with the ZEUS detector at a centre-of-mass energy of 300--318 GeV using an integrated luminosity of 120 pb-1. The measurement was performed in the central rapidity region for transverse momentum per unit of mass in the range 0.3measurements.

ZEUS Collaboration; S. Chekanov

2007-05-25T23:59:59.000Z