利用蒙特卡洛方法估算个体化加速器初级电子线束流参数

何奕松; 余行; 傅玉川; 胡金有; 邹炼

doi:10.12455/j.issn.1671-7104.240632

利用蒙特卡洛方法估算个体化加速器初级电子线束流参数

Estimate the Primary Electron Beam Parameters of Individual Linear Accelerator by Using Monte Carlo Methods

摘要

摘要:
目的利用蒙特卡洛方法估算个体化加速器初级电子线束流参数，包括能量、径向强度分布和平均角度展宽；
方法使用BEAMnrc建立机头模型并生成标准射野，然后使用DOSXYZnrc模拟在水模体中的剂量分布，得到百分深度剂量曲线和离轴比，调试上述参数直到模拟和测量结果匹配。
结果当上述参数分别为6.25 MeV、0.95 mm和0.1°时模拟和测量结果之间能够达到最佳匹配。
结论初级电子线束流参数会对出射线特性产生较大的影响，利用蒙特卡洛方法进行估算是建立个体化加速器模型的重要环节之一。

Abstract:
Objective To estimate the primary electron beam parameters (PEB), including energy, sigma and angular divergence, of the individual linear accelerator by using Monte Carlo method.
Methods A model of treatment head and a standard field were built by BEAMnrc, and the dose distribution was simulated in water phantoms by DOSXYZnrc to obtain the percentage depth dose curve and off-axis ratio. By debugging parameters mentioned above until the simulation and measurement results could match.
Results The simulation and measurement results could achieve the best match when the parameters mentioned above were 6.2 5MeV, 0.95 mm and 0.1°respectively.
Conclusions The PEB of a linear accelerator could have a significant impact on the output beam characteristics. Monte Carlo estimating was one of the most crucial steps of establishing an individual linear accelerator model.

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