Monte Carlo modeling of the Siemens Optifocus multileaf collimator |
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| Institution: | 1. Department of Radiation Oncology, Boston Medical Center, Boston, Massachusetts;2. Harvard Medical School, Boston, Massachusetts;3. Boston University School of Medicine, Boston, Massachusetts;1. Institute of Medical Informatics, Universität zu Lübeck, Germany;2. Centre for Medical Image Computing, University College London, UK;3. Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, UK;4. Department of Oncology, University of Oxford, UK |
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| Abstract: | We have developed a new component module for the BEAMnrc software package, called SMLC, which models the tongue-and-groove structure of the Siemens Optifocus multileaf collimator. The ultimate goal is to perform accurate Monte Carlo simulations of the IMRT treatments carried out with Optifocus. SMLC has been validated by direct geometry checks and by comparing quantitatively the results of simulations performed with it and with the component module VARMLC. Measurements and Monte Carlo simulations of absorbed dose distributions of radiation fields sensitive to the tongue-and-groove effect have been performed to tune the free parameters of SMLC. The measurements cannot be accurately reproduced with VARMLC. Finally, simulations of a typical IMRT field showed that SMLC improves the agreement with experimental measurements with respect to VARMLC in clinically relevant cases.PACS number87.55. K- |
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| Keywords: | Monte Carlo Tongue-and-groove BEAMnrc IMRT Multileaf collimator |
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