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

Kakakhel, Muhammad, Kairn, Tanya, Kenny, John, & Trapp, Jamie (2011) Improved image quality for x-ray CT imaging of gel dosimeters. Medical Physics, 38(9), pp. 5130-5135.

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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. Method: 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, provides an accurate indication of gel density. Conclusions: It is expected that this work will be utilised in the analysis of three-dimensional gel volumes irradiated using complex radiotherapy treatments.

Impact and interest:

7 citations in Scopus
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7 citations in Web of Science®

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205 since deposited on 25 Aug 2011
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ID Code: 44141
Item Type: Journal Article
Keywords: Gel dosimeter, Gel dosimetry, CT, SNR, zero-scan, radiotherapy, polymer gel
ISSN: 0094-2405
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Medical Physics (029903)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > Physics
Copyright Owner: Copyright 2011 Please consult the authors.
Deposited On: 25 Aug 2011 10:23
Last Modified: 27 Aug 2011 16:00

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