Research Photon Energy Spectrum of Medical Linear Accelerator by Monte Carlo Method
10.12455/j.issn.1671-7104.230387
- VernacularTitle:应用蒙特卡罗方法研究医用加速器光子能谱分布
- Author:
Yun XU
1
;
Yu ZHAO
;
Zikang LI
;
Junxiang WU
Author Information
1. 四川大学华西医院雅安医院肿瘤科,雅安市,625000
- Keywords:
Monte Carlo method;
photon;
medical linear accelerator;
energy spectrum
- From:
Chinese Journal of Medical Instrumentation
2024;48(2):156-159
- CountryChina
- Language:Chinese
-
Abstract:
Objective The distribution of the photon energy spectrum in isocenter plane of the medical linear accelerator and the influence of secondary collimator on the photon energy spectrum are studied.Methods Use the BEAMnrc program to simulate the transmission of the 6 MeV electrons and photons in 5 cm×5 cm,10 cm×10 cm,15 cm×15 cm and 20 cm×20 cm fields in treatment head of the medical linear accelerator,where a phase space file was set up at the isocenter plane to record the particle information passing through this plane.The BEAMdp program is used to analyze the phase space file,in order to obtain the distribution of the photon energy spectrum in isocenter plane and the influence of secondary collimator on the photon energy spectrum.Results By analyzing the photon energy spectrum of a medical linear accelerator with a nominal energy of 6 MV,it is found that the secondary collimator has little effect on the photon energy spectrum;different fields have different photon energy spectrum distributions;the photon energy spectrum in different central regions of the same field have the same normalized distribution.Conclusion In the dose calculation of radiation therapy,the influence of photon energy spectrum should be carefully considered.
