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Title: Improved image quality for x-ray CT imaging of gel dosimeters

Abstract

Purpose: This study provides a simple method for improving precision of x-ray computed tomography (CT) scans of irradiated polymer gel dosimetry. The noise affecting CT scans of irradiated gels has been an impediment to the use of clinical CT scanners for gel dosimetry studies. Methods: In this study, it is shown that multiple scans of a single PAGAT gel dosimeter can be used to extrapolate a ''zero-scan'' image which displays a similar level of precision to an image obtained by averaging multiple CT images, without the compromised dose measurement resulting from the exposure of the gel to radiation from the CT scanner. Results: When extrapolating the zero-scan image, it is shown that exponential and simple linear fits to the relationship between Hounsfield unit and scan number, for each pixel in the image, provide an accurate indication of gel density. Conclusions: It is expected that this work will be utilized in the analysis of three-dimensional gel volumes irradiated using complex radiotherapy treatments.

Authors:
; ; ;  [1];  [2];  [2];  [2]
  1. Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Queesland 4001, Australia and Department of Physics and Applied Mathematics, DPAM, Pakistan Institute of Engineering and Applied Sciences, PO Nilore, Islamabad 45450 (Pakistan)
  2. (Australia)
Publication Date:
OSTI Identifier:
22098617
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 38; Journal Issue: 9; Other Information: (c) 2011 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; ACCURACY; CAT SCANNING; DENSITY; DOSEMETERS; EXTRAPOLATION; GELS; NOISE; POLYMERS; RADIOTHERAPY; X RADIATION

Citation Formats

Kakakhel, M. B., Kairn, T., Kenny, J., Trapp, J. V., Premion, The Wesley Medical Centre, Suite 1, 40 Chasely St, Auchenflower, Queensland 4066, Premion, The Wesley Medical Centre, Suite 1, 40 Chasely St, Auchenflower, Queensland 4066, Australia and Australian Clinical Dosimetry Service, ARPANSA, Yallambie, Vic 3085, and Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Ql d 4001. Improved image quality for x-ray CT imaging of gel dosimeters. United States: N. p., 2011. Web. doi:10.1118/1.3626487.
Kakakhel, M. B., Kairn, T., Kenny, J., Trapp, J. V., Premion, The Wesley Medical Centre, Suite 1, 40 Chasely St, Auchenflower, Queensland 4066, Premion, The Wesley Medical Centre, Suite 1, 40 Chasely St, Auchenflower, Queensland 4066, Australia and Australian Clinical Dosimetry Service, ARPANSA, Yallambie, Vic 3085, & Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Ql d 4001. Improved image quality for x-ray CT imaging of gel dosimeters. United States. doi:10.1118/1.3626487.
Kakakhel, M. B., Kairn, T., Kenny, J., Trapp, J. V., Premion, The Wesley Medical Centre, Suite 1, 40 Chasely St, Auchenflower, Queensland 4066, Premion, The Wesley Medical Centre, Suite 1, 40 Chasely St, Auchenflower, Queensland 4066, Australia and Australian Clinical Dosimetry Service, ARPANSA, Yallambie, Vic 3085, and Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Ql d 4001. Thu . "Improved image quality for x-ray CT imaging of gel dosimeters". United States. doi:10.1118/1.3626487.
@article{osti_22098617,
title = {Improved image quality for x-ray CT imaging of gel dosimeters},
author = {Kakakhel, M. B. and Kairn, T. and Kenny, J. and Trapp, J. V. and Premion, The Wesley Medical Centre, Suite 1, 40 Chasely St, Auchenflower, Queensland 4066 and Premion, The Wesley Medical Centre, Suite 1, 40 Chasely St, Auchenflower, Queensland 4066, Australia and Australian Clinical Dosimetry Service, ARPANSA, Yallambie, Vic 3085 and Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Ql d 4001},
abstractNote = {Purpose: This study provides a simple method for improving precision of x-ray computed tomography (CT) scans of irradiated polymer gel dosimetry. The noise affecting CT scans of irradiated gels has been an impediment to the use of clinical CT scanners for gel dosimetry studies. Methods: In this study, it is shown that multiple scans of a single PAGAT gel dosimeter can be used to extrapolate a ''zero-scan'' image which displays a similar level of precision to an image obtained by averaging multiple CT images, without the compromised dose measurement resulting from the exposure of the gel to radiation from the CT scanner. Results: When extrapolating the zero-scan image, it is shown that exponential and simple linear fits to the relationship between Hounsfield unit and scan number, for each pixel in the image, provide an accurate indication of gel density. Conclusions: It is expected that this work will be utilized in the analysis of three-dimensional gel volumes irradiated using complex radiotherapy treatments.},
doi = {10.1118/1.3626487},
journal = {Medical Physics},
issn = {0094-2405},
number = 9,
volume = 38,
place = {United States},
year = {2011},
month = {9}
}