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A Comparison Between GATE and MCNPX Monte Carlo Codes in Simulation of Medical Linear Accelerator
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نویسنده
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sadoughi hamid reza ,nasseri shahrokh ,momennezhad mahdi ,sadeghi hamid reza ,Bahreyni Toosi Mohammad Hossein
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منبع
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journal of medical signals and sensors - 2014 - دوره : 4 - شماره : 1 - صفحه:10 -17
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چکیده
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Radiotherapy dose calculations can be evaluated by monte carlo (mc) simulations with acceptable accuracy for dose prediction incomplicated treatment plans. in this work, standard, livermore and penelope electromagnetic (em) physics packages of geant4application for tomographic emission (gate) 6.1 were compared versus monte carlo n particle extended (mcnpx) 2.6 in simulationof 6 mv photon linac. to do this, similar geometry was used for the two codes. the reference values of percentage depth dose (pdd)and beam profiles were obtained using a 6 mv elekta compact linear accelerator, scanditronix water phantom and diode detectors. nosignificant deviations were found in pdd, dose profile, energy spectrum, radial mean energy and photon radial distribution, which werecalculated by standard and livermore em models and mcnpx, respectively. nevertheless, the penelope model showed an extremedifference. statistical uncertainty in all the simulations was < 1%, namely 0.51%, 0.27%, 0.27% and 0.29% for pdds of 10 cm2 by 10 cm2 filed size, for mcnpx, standard, livermore and penelope models, respectively. differences between spectra in various regions, inradial mean energy and in photon radial distribution were due to different cross section and stopping power data and not the samesimulation of physics processes of mcnpx and three em models. for example, in the standard model, the photoelectron directionwas sampled from the gavrila sauter distribution, but the photoelectron moved in the same direction of the incident photons in thephotoelectric process of livermore and penelope models. using the same primary electron beam, the standard and livermore emmodels of gate and mcnpx showed similar output, but retuning of primary electron beam is needed for the penelope model.
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کلیدواژه
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Energy spectrum ,GEANT4 application for tomographic emission ,linac simulation ,Monte Carlo N Particle eXtended ,photon radial distribution ,radial mean energy
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آدرس
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mashhad university of medical sciences, ایران, mashhad university of medical sciences, ایران, mashhad university of medical sciences, ایران, mashhad university of medical sciences, ایران, mashhad university of medical sciences, ایران
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Authors
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