Accurately simulating the production of radiotherapy portal images using non-zero beam angles
In this study, the delivery and portal imaging of one square-field and one conformal radiotherapy treatment was simulated using the Monte Carlo codes BEAMnrc and DOSXYZnrc. The treatment fields were delivered to a humanoid phantom from different angles by a 6 MV photon beam linear accelerator, with an amorphous-silicon electronic portal imaging device (a-Si EPID) used to provide images of the phantom generated by each field. The virtual phantom preparation code CTCombine was used to combine a computed-tomography-derived model of the irradiated phantom with a simple, rectilinear model of the a-Si EPID, at each beam angle used in the treatment. Comparison of the resulting experimental and simulated a-Si EPID images showed good agreement, within [gamma](3%, 3 mm), indicating that this method may be useful in providing accurate Monte Carlo predictions of clinical a-Si EPID images, for use in the verification of complex radiotherapy treatments.
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|Item Type:||Journal Article|
|Keywords:||Computer simulation, EPID, Medical imaging, Radiation therapy|
|Subjects:||Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000)|
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OTHER MEDICAL AND HEALTH SCIENCES (119900) > Medical and Health Sciences not elsewhere classified (119999)
|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
|Deposited On:||06 Mar 2012 08:23|
|Last Modified:||06 Mar 2012 08:24|
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