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CTCombine : rotating and combining CT data with an accurate detector model, to simulate radiotherapy portal imaging at non-zero beam angles

Kairn, Tanya, Dwyer, Mark, Warne, David, Markwell, Tim, Trapp, Jamie, & Fielding, Andrew L. (2009) CTCombine : rotating and combining CT data with an accurate detector model, to simulate radiotherapy portal imaging at non-zero beam angles. In EPSM-ABEC 2009 : Engineering and Physical Sciences in Medicine and the Australian Biomedical Engineering College Conference, 8-12 November 2009, Canberra, Australia. (Unpublished)

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Abstract

Established Monte Carlo user codes BEAMnrc and DOSXYZnrc permit the accurate and straightforward simulation of radiotherapy experiments and treatments delivered from multiple beam angles. However, when an electronic portal imaging detector (EPID) is included in these simulations, treatment delivery from non-zero beam angles becomes problematic. This study introduces CTCombine, a purpose-built code for rotating selected CT data volumes, converting CT numbers to mass densities, combining the results with model EPIDs and writing output in a form which can easily be read and used by the dose calculation code DOSXYZnrc. The geometric and dosimetric accuracy of CTCombine’s output has been assessed by simulating simple and complex treatments applied to a rotated planar phantom and a rotated humanoid phantom and comparing the resulting virtual EPID images with the images acquired using experimental measurements and independent simulations of equivalent phantoms. It is expected that CTCombine will be useful for Monte Carlo studies of EPID dosimetry as well as other EPID imaging applications.

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ID Code: 29881
Item Type: Conference Item (Poster)
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Medical Physics (029903)
Divisions: Current > QUT Faculties and Divisions > Division of Technology, Information and Learning Support
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Research Centres > High Performance Computing and Research Support
Copyright Owner: Copyright 2009 please contact the authors
Deposited On: 22 Jan 2010 10:22
Last Modified: 22 Jun 2011 00:58

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