Commissioning of a Geant4 based treatment plan simulation tool : linac model and dicom-rt interface

Cornelius, Iwan, Poole, Christopher, Langton, Christian M., Hill, Brendan, Middlebrook, Nigel, & Oborn, Brad (2010) Commissioning of a Geant4 based treatment plan simulation tool : linac model and dicom-rt interface. In 29th European Society for Therapeutic Radiology and Oncology Conference (ESTRO 29), 12-16 September 2010, Barcelona. (Unpublished)

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A Geant4 based simulation tool has been developed to perform Monte Carlo modelling of a 6 MV VarianTM iX clinac. The computer aided design interface of Geant4 was used to accurately model the LINAC components, including the Millenium multi-leaf collimators (MLCs). The simulation tool was verified via simulation of standard commissioning dosimetry data acquired with an ionisation chamber in a water phantom. Verification of the MLC model was achieved by simulation of leaf leakage measurements performed using GafchromicTM film in a solid water phantom. An absolute dose calibration capability was added by including a virtual monitor chamber into the simulation. Furthermore, a DICOM-RT interface was integrated with the application to allow the simulation of treatment plans in radiotherapy. The ability of the simulation tool to accurately model leaf movements and doses at each control point was verified by simulation of a widely used intensity-modulated radiation therapy (IMRT) quality assurance (QA) technique, the chair test.

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ID Code: 41556
Item Type: Conference Paper
Refereed: No
Additional Information:

Also presented at 1st Geant4 Australian School and User Workshop, NSW

11-16 April, 2011
University of Wollongong,

Additional URLs:
Keywords: geant4, radiotherapy, chair test, quality assurance, imrt, monte carlo, rapidarc
Subjects: 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
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > Physics
Copyright Owner: Copyright 2011 [please consult the author]
Deposited On: 04 May 2011 23:18
Last Modified: 07 Sep 2013 07:55

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