PMID: 11930913Apr 5, 2002Paper

Sensitivity of megavoltage photon beam Monte Carlo simulations to electron beam and other parameters

Medical Physics
Daryoush Sheikh-Bagheri, D W O Rogers

Abstract

The BEAM code is used to simulate nine photon beams from three major manufacturers of medical linear accelerators (Varian, Elekta, and Siemens), to derive and evaluate estimates for the parameters of the electron beam incident on the target, and to study the effects of some mechanical parameters like target width, primary collimator opening, flattening filter material and density. The mean energy and the FWHM of the incident electron beam intensity distributions (assumed Gaussian and cylindrically symmetric) are derived by matching calculated percentage depth-dose curves past the depth of maximum dose (within 1% of maximum dose) and off-axis factors (within 2sigma at 1% statistics or less) with measured data from the AAPM RTC TG-46 compilation. The off-axis factors are found to be very sensitive to the mean energy of the electron beam, the FWHM of its intensity distribution, its angle of incidence, the dimensions of the upper opening of the primary collimator, the material of the flattening filter and its density. The off-axis factors are relatively insensitive to the FWHM of the electron beam energy distribution, its divergence and the lateral dimensions of the target. The depth-dose curves are sensitive to the electron beam e...Continue Reading

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Citations

Sep 9, 2006·Radiation Medicine·Alireza Farajollahi, Asghar Mesbahi
Aug 21, 2007·Radiation Medicine·Asghar MesbahiAlireza Farajollahi
Mar 23, 2011·Australasian Physical & Engineering Sciences in Medicine·M B KakakhelJ V Trapp
Dec 19, 2012·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·M AtarodA Azarnoosh
Jun 5, 2012·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)·K AsnaashariMostafa Heydarian
May 16, 2006·Medical Physics·Oleg N VassilievRadhe Mohan
May 16, 2006·Medical Physics·Khaled AljarrahSteve B Jiang
Apr 4, 2008·Medical Physics·Paolo FrancesconCarlo Cavedon
Oct 12, 2007·Medical Physics·Stephen F KryMohammad Salehpour
Jun 30, 2005·Medical Physics·S D ThomasUNKNOWN American Association of Physicists in Medicine
Sep 13, 2006·Medical Physics·I Kawrakow, B R B Walters
Mar 17, 2010·Medical Physics·Joel St AubinB G Fallone
Apr 19, 2007·Medical Physics·Javier PenaGuenther H Hartmann
Apr 15, 2008·Medical Physics·George X DingCharles W Coffey
Jul 23, 2011·Medical Physics·P TsiamasP Zygmanski
Aug 14, 2008·Medical Physics·Edwin ShamErvin B Podgorsak

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