期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2020
卷号：98
期号：8
页码：1151-1162
出版社：Journal of Theoretical and Applied
摘要：This work relates to the study of a Varian Clinac IX 6MV photon beam from measurement and simulation of tree fundamental functions, the Percentage Depth Dose (PDD), the Dose Profile (DP) and the collimator scatter factor (Sc). Simulations were performed using the recent version of the Monte Carlo simulation code GATE (v8.1). It was used to model the geometry of the accelerator head, optimize the configuration of the electron source and calculate the dose for different field sizes (3x3 cm2 , 4x4 cm2 , 6x6 cm2 , 8x8 cm2 , 12x12 cm2 , 15x15 cm2 , and 20x20 cm2 ). The Geometry was modeled using the parameters given by the Varian manufacturer under agreement. To generate the bremsstrahlung photon beam, an electron source with a mean energy of 5.8MeV and a half-width of 1mm was used, its parameters were determined for a relative dose difference between 2% and 2.5% for PDD and DP respectively. After using the simulation splitting, the variance reduction and the phase space techniques, the computing time consumed by the simulations was reduced by a factor of 160. Otherwise Good agreement within 1% was found for the Collimator scatter factor (Sc). The presented results show that the GATE model of Varian Clinac IX 6MV photon beam might be used to evaluate the systematics dosimetric errors and for clinical applications using the recent treatment technics.
