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.

This is the latest version of this eprint.

View at publisher


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:

9 citations in Scopus
Search Google Scholar™
9 citations in Web of Science®

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

261 since deposited on 25 Aug 2011
7 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 44141
Item Type: Journal Article
Refereed: Yes
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 00:23
Last Modified: 27 Aug 2011 06:00

Available Versions of this Item

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page