GAMOS-based Monte Carlo simulation for dose calculation in electron radiotherapy: a dosimetric analysis(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第7期
- Page:
- 850-857
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- GAMOS-based Monte Carlo simulation for dose calculation in electron radiotherapy: a dosimetric analysis
- Author(s):
- LI Yi1; YANG Ze2; WU Wenjing3
- 1. Department of Radiation Oncology, First Affiliated Hospital of Xian Jiaotong University, Xian 710061, China 2. Department of Radiation Oncology, Yulin No.2 Hospital Yulin 719000, China 3. Department of Radiological Health, Xian Center for Disease Control and Prevention, Xian 710054, China
- Keywords:
- Keywords: GAMOS Monte Carlo electron radiotherapy dosimetry
- PACS:
- R815.6；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.07.010
- Abstract:
- Abstract: Objective To discuss the accuracy of Monte Carlo simulation based on GAMOS for dose calculation in electron radiotherapy. Methods The physical model of electron beams for Varian Rapidarc linear accelerator was constructed by GAMOS-based Monte Carlo simulation. The model consisted of 3 levels of energy (6, 9, 12 MeV) and 3 applicators ［(6×6), (10×10), (15×15) cm2］. The dose distribution of electron beams in water phantom was simulated, and the obtained results were then compared with the measured results of percentage depth dose (PDD) and cross plane beam profile for evaluating the accuracy and efficiency of Monte Carlo simulation based on GAMOS for dose calculation in electron radiotherapy. Results With more simulated particles, the error between the simulation results and measurement results was smaller. When the number of simulated particles reached 5×108, the simulation results of electron beam range (Rp) and depth of 50% maximum dose (R50) were consistent with the measurement results. The error was within 2% between the PDD results of simulation and measurement excluding the building-up range. The error in cross plane beam profile was also within 2% between simulation results and measurement results among all range, and the simulated radiation field size was consistent with the measured results. With higher level of energy, the applicator size was larger, and the time used in parallel and synchronous simulation is longer, and the variation of simulation time was greater.
Conclusion Monte Carlo simulation based on GAMOS can accurately simulate the dose distribution in electron radiotherapy. The increase number of particles can improve the accuracy of simulation, and the parallel and synchronous calculation can improve the efficiency of simulation.
Last Update: 2020-07-28