Monte Carlo simulation of a dynamic MLC: implementation and applications

Fix, MK; Manser, P; Born, EJ; Vetterli, D; Mini, R; Rüegsegger, P (2001). Monte Carlo simulation of a dynamic MLC: implementation and applications. Medical physics, 11(3), pp. 163-70. College Park, Md.: American Association of Physicists in Medicine AAPM 10.1118/1.1328386

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PURPOSE: Study 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. METHODS: The 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. RESULTS: The 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. CONCLUSION: The MSM together with the implementation of the MLC is appropriate for a number of investigations in intensity-modulated radiation therapy (IMRT).

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Radiation Oncology > Medical Radiation Physics

UniBE Contributor:

Fix, Michael, Manser, Peter, Vetterli, Daniel, Mini, Roberto






American Association of Physicists in Medicine AAPM




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Date Deposited:

04 Oct 2013 14:56

Last Modified:

05 Dec 2022 14:17

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URI: (FactScience: 47012)

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