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Title: Pseudomonoenergetic x-ray diffraction measurements using balanced filters for coherent-scatter computed tomography

Abstract

Coherent-scatter computed tomography (CSCT) is a method of ''composition'' imaging based on measurements of diffraction patterns from tissues. Use of an x-ray tube degrades scatter pattern angular resolution due to the x-ray spectral width, making it difficult to uniquely identify some materials. The use of two transmission filters with similar atomic numbers (balanced ''Ross filters'') to generate pseudomonoenergetic scatter patterns is described as it applies to CSCT. An analysis of angular-blur mechanisms reveals that focal spot size and beam width are the most important factors determining Bragg-peak width when Er-Tm filters are used. A relative RMS spectral width of 1% can be achieved in the difference spectrum and a Bragg-peak RMS angular width of approximately 0.14 deg. (relative width of 3% at 5 deg. scatter angle) can be achieved with an effective energy of 58 keV.

Authors:
;  [1]
  1. Department of Medical Biophysics, Robarts Research Institute, and Lawson Health Research Institute, University of Western Ontario, 100 Perth Drive, London, Ontario N6A 5K8 (Canada)
Publication Date:
OSTI Identifier:
22100514
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 36; Journal Issue: 5; Other Information: (c) 2009 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 62 RADIOLOGY AND NUCLEAR MEDICINE; BEAM PROFILES; BRAGG CURVE; COMPUTERIZED TOMOGRAPHY; ERBIUM; FILTERS; KEV RANGE 10-100; SPECTRA; THULIUM; X RADIATION; X-RAY DIFFRACTION; X-RAY TUBES

Citation Formats

Beath, S. R., and Cunningham, I. A. Pseudomonoenergetic x-ray diffraction measurements using balanced filters for coherent-scatter computed tomography. United States: N. p., 2009. Web. doi:10.1118/1.3108394.
Beath, S. R., & Cunningham, I. A. Pseudomonoenergetic x-ray diffraction measurements using balanced filters for coherent-scatter computed tomography. United States. https://doi.org/10.1118/1.3108394
Beath, S. R., and Cunningham, I. A. 2009. "Pseudomonoenergetic x-ray diffraction measurements using balanced filters for coherent-scatter computed tomography". United States. https://doi.org/10.1118/1.3108394.
@article{osti_22100514,
title = {Pseudomonoenergetic x-ray diffraction measurements using balanced filters for coherent-scatter computed tomography},
author = {Beath, S. R. and Cunningham, I. A.},
abstractNote = {Coherent-scatter computed tomography (CSCT) is a method of ''composition'' imaging based on measurements of diffraction patterns from tissues. Use of an x-ray tube degrades scatter pattern angular resolution due to the x-ray spectral width, making it difficult to uniquely identify some materials. The use of two transmission filters with similar atomic numbers (balanced ''Ross filters'') to generate pseudomonoenergetic scatter patterns is described as it applies to CSCT. An analysis of angular-blur mechanisms reveals that focal spot size and beam width are the most important factors determining Bragg-peak width when Er-Tm filters are used. A relative RMS spectral width of 1% can be achieved in the difference spectrum and a Bragg-peak RMS angular width of approximately 0.14 deg. (relative width of 3% at 5 deg. scatter angle) can be achieved with an effective energy of 58 keV.},
doi = {10.1118/1.3108394},
url = {https://www.osti.gov/biblio/22100514}, journal = {Medical Physics},
issn = {0094-2405},
number = 5,
volume = 36,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2009},
month = {Fri May 15 00:00:00 EDT 2009}
}