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Title: Compositional Images from the Diffrction Enhanced Imaging Technique

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930280
Report Number(s):
BNL-80981-2008-JA
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods A; Journal Volume: 572; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
national synchrotron light source

Citation Formats

Hasnah,M., Zhong, Z., Parham, C., Zhang, H., and Chapman, D. Compositional Images from the Diffrction Enhanced Imaging Technique. United States: N. p., 2007. Web. doi:10.1016/j.nima.2006.11.066.
Hasnah,M., Zhong, Z., Parham, C., Zhang, H., & Chapman, D. Compositional Images from the Diffrction Enhanced Imaging Technique. United States. doi:10.1016/j.nima.2006.11.066.
Hasnah,M., Zhong, Z., Parham, C., Zhang, H., and Chapman, D. Mon . "Compositional Images from the Diffrction Enhanced Imaging Technique". United States. doi:10.1016/j.nima.2006.11.066.
@article{osti_930280,
title = {Compositional Images from the Diffrction Enhanced Imaging Technique},
author = {Hasnah,M. and Zhong, Z. and Parham, C. and Zhang, H. and Chapman, D.},
abstractNote = {},
doi = {10.1016/j.nima.2006.11.066},
journal = {Nuclear Instruments and Methods A},
number = 2,
volume = 572,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • No abstract prepared.
  • Images of rat bone of different age groups (8, 56 and 78 weeks), lumbar vertebra and calcium hydroxyapatite phantom are obtained utilizing the diffraction-enhanced imaging technique. Images obtained with DEI are of superior quality and this novel technique may be an excellent choice for better visualization of the microstructure and the embedded spongiosa. Our motivation is to develop the optimizing tomography with the use of the data obtained at multiple energies.
  • We have used backscattering spectrometry and {sup 15}N({sup 1}H,{alpha},{gamma}){sup 12}C nuclear reaction analysis techniques to study in detail the variation in the composition of silicon oxynitride films with deposition parameters. The films were deposited using 2.45 GHz electron cyclotron resonance plasma-enhanced chemical vapor deposition (PECVD) technique from mixtures of precursors argon, nitrous oxide, and silane at deposition temperature 90 deg. C. The deposition pressure and nitrous oxide-to-silane gas flow rates ratio have been found to have a pronounced influence on the composition of the films. When the deposition pressure was varied for a given nitrous oxide-to-silane gas flow ratio, themore » amount of silicon and nitrogen increased with the deposition pressure, while the amount of oxygen decreased. For a given deposition pressure, the amount of incorporated nitrogen and hydrogen decreased while that of oxygen increased with increasing nitrous oxide-to-silane gas flow rates ratio. For nitrous oxide-to-silane gas flow ratio of 5, we obtained films which contained neither chemically bonded nor nonbonded nitrogen atoms as revealed by the results of infrared spectroscopy, backscattering spectrometry, and nuclear reaction analysis. Our results demonstrate the nitrogen-free nearly stoichiometric silicon dioxide films can be prepared from a mixture of precursors argon, nitrous oxide, and silane at low substrate temperature using high-density PECVD technique. This avoids the use of a hazardous and an often forbidden pair of silane and oxygen gases in a plasma reactor.« less
  • Purpose: In clinical research, it is important to measure choroidal thickness when eyes are affected by various diseases. The main purpose is to automatically segment choroid for enhanced depth imaging optical coherence tomography (EDI-OCT) images with five B-scans averaging. Methods: The authors present an automated choroid segmentation method based on choroidal vasculature characteristics for EDI-OCT images with five B-scans averaging. By considering the large vascular of the Haller’s layer neighbor with the choroid-sclera junction (CSJ), the authors measured the intensity ascending distance and a maximum intensity image in the axial direction from a smoothed and normalized EDI-OCT image. Then, basedmore » on generated choroidal vessel image, the authors constructed the CSJ cost and constrain the CSJ search neighborhood. Finally, graph search with smooth constraints was utilized to obtain the CSJ boundary. Results: Experimental results with 49 images from 10 eyes in 8 normal persons and 270 images from 57 eyes in 44 patients with several stages of diabetic retinopathy and age-related macular degeneration demonstrate that the proposed method can accurately segment the choroid of EDI-OCT images with five B-scans averaging. The mean choroid thickness difference and overlap ratio between the authors’ proposed method and manual segmentation drawn by experts were −11.43 μm and 86.29%, respectively. Conclusions: Good performance was achieved for normal and pathologic eyes, which proves that the authors’ method is effective for the automated choroid segmentation of the EDI-OCT images with five B-scans averaging.« less