Monte Carlo simulation of a dynamic MLC: Implementation and applications |
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| Affiliation: | 1. Institute for Biomedical Engineering, University of Zürich and ETH;2. Division of Medical Radiation Physics, Clinic of Radio-Oncology, Inselspital and University of Berne;1. Institute of Nuclear Sciences, Ankara University, Beşevler, 06100 Ankara, Turkey;2. Nuclear Physics Laboratory, Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;3. Solid State Physics section, Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;4. McDaniel College, Physics Department, Westminster, MD 21157, USA;1. Rubin Institute of Advanced Orthopedics, International Center for Limb Lengthening, 2401 W Belvedere Avenue, Baltimore, MD 21215, USA;2. CHI Franciscan Advanced Foot and Ankle Fellowship, Franciscan Foot and Ankle Associates, 16233 Sylvester Road Southwest, Burien, WA 98166, USA;1. Co-creative Research Center of Industrial Science and Technology, Kanazawa Institute of Technology (KIT), 3–1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan;2. Division of Radiation Oncology, Graduate School of Medicine, Kobe University, 7–5-2 Kusunokicho, Chuouku, Kobe, Hyogo 650-0017, Japan;3. Department of Applied Chemistry, Tohoku University, 6–6-07 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;4. Division of Materials Science, Nara Institute of Science and Technology (NAIST), 8916–5 Takayama, Ikoma, Nara 630-0192, Japan |
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| Abstract: | PurposeStudy of behavior and influence of a multileaf collimator (MLC) on dose calculation, verification, and portal energy spectra in the case of intensity-modulated fields obtained with a step-and-shoot or a dynamic technique.MethodsThe 80-leaf MLC for the Varian Clinac 2300 C/D was implemented in a previously developed Monte Carlo (MC) based multiple source model (MSM) for a 6 MV photon beam. Using this model and the MC program GEANT, dose distributions, energy fluence maps and energy spectra at different portal planes were calculated for three different MLC applications.ResultsThe comparison of MC-calculated dose distributions in the phantom and portal plane, with those measured with films showed an agreement within 3 % and 1.5 mm for all cases studied. The deviations mainly occur in the extremes of the intensity modulation. The MC method allows to investigate, among other aspects, dose components, energy fluence maps, tongue-and-groove effects and energy spectra at portal planes.ConclusionThe MSM together with the implementation of the MLC is appropriate for a number of investigations in intensity-modulated radiation therapy (IMRT). |
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| Keywords: | Monte Carlo simulation beam model dynamic MLC IMRT Monte-Carlo-Simulationen Strahlmodelle dynamischer MLC IMRT |
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