Air-core grid for scattered x-ray rejection

Logan, Clinton M; Lane, Stephen M

Title: Air-core grid for scattered x-ray rejection

Full Record
Other Related Research

Abstract

The invention is directed to a grid used in x-ray imaging applications to block scattered radiation while allowing the desired imaging radiation to pass through, and to process for making the grid. The grid is composed of glass containing lead oxide, and eliminates the spacer material used in prior known grids, and is therefore, an air-core grid. The glass is arranged in a pattern so that a large fraction of the area is open allowing the imaging radiation to pass through. A small pore size is used and the grid has a thickness chosen to provide high scatter rejection. For example, the grid may be produced with a 200 .mu.m pore size, 80% open area, and 4 mm thickness.

Inventors:

Logan, Clinton M ^[1]; Lane, Stephen M ^[2]

Pleasanton, CA
Oakland, CA

Publication Date:: Sun Jan 01 00:00:00 EST 1995

Research Org.:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

OSTI Identifier:: 870097

Patent Number(s):: US 5455849

Assignee:: Regents of University of California (Oakland, CA)

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: air-core; grid; scattered; x-ray; rejection; directed; imaging; applications; block; radiation; allowing; desired; pass; process; composed; glass; containing; lead; oxide; eliminates; spacer; material; prior; grids; arranged; pattern; fraction; pore; size; thickness; chosen; provide; scatter; example; produced; 200; 80; ray imaging; pore size; lead oxide; x-ray imaging; scattered radiation; spacer material; containing lead; imaging applications; scattered x-ray; glass containing; imaging radiation; /378/

Citation Formats


                    Logan, Clinton M, and Lane, Stephen M. Air-core grid for scattered x-ray rejection.  United States: N. p., 1995. 
        Web.

Copy to clipboard


                    Logan, Clinton M, & Lane, Stephen M. Air-core grid for scattered x-ray rejection.  United States.

Copy to clipboard


                    Logan, Clinton M, and Lane, Stephen M. 1995.  
        "Air-core grid for scattered x-ray rejection".  United States.  https://www.osti.gov/servlets/purl/870097.

Copy to clipboard


                    
@article{osti_870097,

  title        = {Air-core grid for scattered x-ray rejection},

  author       = {Logan, Clinton M and Lane, Stephen M},

  abstractNote = {The invention is directed to a grid used in x-ray imaging applications to block scattered radiation while allowing the desired imaging radiation to pass through, and to process for making the grid. The grid is composed of glass containing lead oxide, and eliminates the spacer material used in prior known grids, and is therefore, an air-core grid. The glass is arranged in a pattern so that a large fraction of the area is open allowing the imaging radiation to pass through. A small pore size is used and the grid has a thickness chosen to provide high scatter rejection. For example, the grid may be produced with a 200 .mu.m pore size, 80% open area, and 4 mm thickness.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/870097},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Jan 01 00:00:00 EST 1995},

  month        = {Sun Jan 01 00:00:00 EST 1995}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Air-core grid for scattered x-ray rejection

Patent Logan, C; Lane, S

The invention is directed to a grid used in x-ray imaging applications to block scattered radiation while allowing the desired imaging radiation to pass through, and to process for making the grid. The grid is composed of glass containing lead oxide, and eliminates the spacer material used in prior known grids, and is therefore, an air-core grid. The glass is arranged in a pattern so that a large fraction of the area is open allowing the imaging radiation to pass through. A small pore size is used and the grid has a thickness chosen to provide high scatter rejection. Formore »« less
Nuclear reactor spacer grid and ductless core component

Patent Christiansen, D; Karnesky, R

This invention relates to a nuclear reactor spacer grid member for use in a liquid cooled nuclear reactor and to a ductless core component employing a plurality of these spacer grid members. The spacer grid member is of the egg-shell type and is constructed so that the walls of the cell members of the grid member are formed of a single thickness of metal to avoid tolerance problems. Within each cell member is a hydraulic spring which laterally constrains the nuclear material bearing rod which passes through each cell member against a hardstop in response to coolant flow through themore »« less
Nuclear reactor spacer grid and ductless core component

Patent Christiansen, David; Karnesky, Richard

The invention relates to a nuclear reactor spacer grid member for use in a liquid cooled nuclear reactor and to a ductless core component employing a plurality of these spacer grid members. The spacer grid member is of the egg-shell type and is constructed so that the walls of the cell members of the grid member are formed of a single thickness of metal to avoid tolerance problems. Within each cell member is a hydraulic spring which laterally constrains the nuclear material bearing rod which passes through each cell member against a hardstop in response to coolant flow through themore »« less
Full Text Available
WE-AB-207A-10: Transmission Characteristics of a Two Dimensional Antiscatter Grid Prototype for CBCT

Journal Article Altunbas, C; Kavanagh, B; Miften, M - Medical Physics

Purpose: Scattered radiation remains to be a major contributor to image quality degradation in CBCT. To address the scatter problem, a focused, 2D antiscatter grid (2DASG) prototype was designed, and fabricated using additive manufacturing processes. Its scatter and primary transmission properties were characterized using a linac mounted CBCT system. Methods: The prototype 2DASG was composed of rectangular grid holes separated by tungsten septa, and has a grid pitch of 2.91 mm, grid ratio of 8, and a septal thickness of 0.1 mm. Each grid hole was aligned or focused towards the x-ray source in half-fan (i.e. offset detector) geometry ofmore »« less
https://doi.org/10.1118/1.4957763
Spacer Grid and Mixing Vanes Effects Study on Two-phase Flow Using Bubble Tracking Simulations

Journal Article Fang, Jun; Bolotnov, Igor - Transactions of the American Nuclear Society

In Light Water Reactor (LWR) cores, the nuclear fuel rods are arranged together as rod bundles in a triangular or square pattern. The fuel rod bundles are supported by the spacer grids with mixing vanes. An understanding of spacer grid and mixing vanes effect is important since it has a direct impact on the turbulence structure in the flow and the heat removal efficiency from the fuel rod surface. Although a considerable amount of literature has been published on the experimental investigation of spacer grid and mixing vanes effect, the measurements were mainly focused on single-phase flow. The influence ofmore »« less

Similar Records