Application of Monte Carlo Simulation for the Medical Linear Accelerator in Radiotherapy
Ahmed Sayed Hamed Ali;
Abstract
Most of commercial Treatment Planing Syatem (TPS), use an analytical calculation for estimating dose to patient, Such methods are less accurate in practice. In alternative, Monte Carlo calculation using GATE/GEANT4, can be used for accurate dose calculation. This technique represents a powerful tool for simulation of complex geometrical shapes and material composition by using different physics models.
In the present work, a Monte Carlo simulation for 6 MV high energy photon medical linear accelerator (Linac), using GATE/GEANT4 was introduced. The gantry of a VARIAN 600C LINAC was simulated according to the manufacturer’s detailed information was simulated. The simulation processes were performed on two stages. The first stage includes simulation of the accelerator gantry resulting to phase space file (PhS) formation, the phase space file (PhS) was generated by using more than 2x 109 primary electron. Such a phase space file records all information of the simulated hits crossing a scoring plane, such as energy, orientation, type, charge and position of the particles crossing the scoring plane. While the second stage was executed by interactions of recorded hits from a given (PhS) file, with a water phantom of dimensions 48cm×48cm×35cm at source-surface distance (SSD) = 100 cm, were the percentage depth dose (PDD) and the flatness symmetry for different field sizes were calculated relative to reference depth 1.5 cm at the isocenter. A macro files were created for the purposes analysis of beam characteristic at two stations in the treatment head.
During the physics sitting construction, the geometrical specification of the accelerator , as well as the beam energy were taken into consideration. A 6 MV circular electron beam with a gaussian energy distribution accelerated down to hit the tungsten and cupper target were bremsstrahlung photons are generated. These photons and secondary particles are interacting with the flattening filter, monitor chamber, mirror and a pair of Jaws.
In the present work, a Monte Carlo simulation for 6 MV high energy photon medical linear accelerator (Linac), using GATE/GEANT4 was introduced. The gantry of a VARIAN 600C LINAC was simulated according to the manufacturer’s detailed information was simulated. The simulation processes were performed on two stages. The first stage includes simulation of the accelerator gantry resulting to phase space file (PhS) formation, the phase space file (PhS) was generated by using more than 2x 109 primary electron. Such a phase space file records all information of the simulated hits crossing a scoring plane, such as energy, orientation, type, charge and position of the particles crossing the scoring plane. While the second stage was executed by interactions of recorded hits from a given (PhS) file, with a water phantom of dimensions 48cm×48cm×35cm at source-surface distance (SSD) = 100 cm, were the percentage depth dose (PDD) and the flatness symmetry for different field sizes were calculated relative to reference depth 1.5 cm at the isocenter. A macro files were created for the purposes analysis of beam characteristic at two stations in the treatment head.
During the physics sitting construction, the geometrical specification of the accelerator , as well as the beam energy were taken into consideration. A 6 MV circular electron beam with a gaussian energy distribution accelerated down to hit the tungsten and cupper target were bremsstrahlung photons are generated. These photons and secondary particles are interacting with the flattening filter, monitor chamber, mirror and a pair of Jaws.
Other data
| Title | Application of Monte Carlo Simulation for the Medical Linear Accelerator in Radiotherapy | Other Titles | تطبيق محاكاة مونت كارلو للمعجل الخطى الطبى فى العلاج الإشعاعى | Authors | Ahmed Sayed Hamed Ali | Issue Date | 2014 |
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