A virtual source model of electron contamination of a therapeutic photon beam

Physics in Medicine and Biology
Marcin Sikora, Markus Alber

Abstract

The most efficient way of generating particles for Monte Carlo (MC) dose calculation is through a virtual source model (VSM) of the linear accelerator head. We have previously developed a VSM based on three sources: a primary photon source, a secondary photon source and an electron contamination source (Sikora et al 2007). In this work, we present an improvement of the electron contamination source. The VSM of contamination electrons (eVSM) is derived from a full MC simulation of the accelerator head with the BEAMnrc MC system. It comprises a Gaussian source located at the base of the flattening filter. The eVSM models two effects: an energy-dependent source diameter and an angular dependence of the particle fluence. The air scatter of the contamination electrons is approximated by energetic properties of the eVSM so that explicit in-air transport is not required during MC simulation of the dose distributions in the patient. The calculations of electron dose distributions were compared between the eVSM and the full MC simulation. Good agreement was achieved for various rectangular field sizes as well as for complex conformal segment shapes for the contamination electrons of 6 and 15 MV beams. The 3D dose evaluation of the surfa...Continue Reading

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Citations

Sep 14, 2012·Australasian Physical & Engineering Sciences in Medicine·Hani AlnawafPeter K N Yu
Jun 19, 2013·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Ahad Ollah EzzatiMatthew T Studenski
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Nov 27, 2016·Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... [et al]·Lorenzo BruallaAntonio M Lallena
Mar 19, 2021·Journal of Applied Clinical Medical Physics·Stefano PifferCinzia Talamonti
May 7, 2021·Journal of Medical Physics·Ahad Ollah EzzatiMasuomeh Gohari
Jun 22, 2021·Journal of Applied Clinical Medical Physics·Philipp SzeverinskiAlexander F DeVries

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