期刊论文

Optimalizing electron beam parameters of linear accelerator based on Monte Carlo simulation

Wu, H.

中文

核技术

0253-3219

2018

41

6

1-6

10.11889/j.0253-3219.2018.hjs.41.060201

湖南省重点研发计划(No.2015SK2022)、湖南省自然科学青年基金项目(No.2016JJ3108)资助 第一作者：张帆，男，1991 年出生，2014 年毕业于湖南师范大学，现为硕士研究生，研究领域为医学物理； 肖爱农，男，1965 年出生，1998 年毕业于衡阳医学院，副主任医师，研究领域为肿瘤放射治疗 通信作者：伍海彪，E-mail: wuhaibiao@163.com 收稿日期：2018-02-05，修回日期：2018-03-13 Supported by Key Research and Development Program of Hunan Province (No.2015SK2022), Hunan Natural Science Youth Foundation (No.2016JJ3108) First author: ZHANG Fan, male, born in 1991, graduated from Hunan Normal University in 2014, master student, focusing on medical physics; XIAO Ainong, male, born in 1965, graduated from Hengyang Medical College in 1998, focusing on radiation oncology Corresponding author: WU Haibiao, E-mail: wuhaibiao@163.com Received date: 2018-02-05, revised date: 2018-03-13

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通过蒙特卡罗方法模拟瓦里安IX加速器6 MV能量档、10 cm×10 cm射野下的剂量分布,研究电子线参数对剂量分布的影响,并寻找确定最优电子线参数的简化方法。结果表明：当电子线平均能量和径向强度分布分别在5.5-6.4 Me V及0.1-0.4 cm变化时,百分深度剂量没有显著变化;当径向强度分布在0-0.19 cm变化时,主剂量区内模拟与测量的离轴剂量差异很小,但在半影区,二者之间有较大差异;通过调整平均角展宽,可以使不同深度处模拟与测量的离轴剂量有更好的符合度。根据本文提出的电子线参数确定方法可以使模拟的剂量更为精确,由于百分深度剂量与离轴剂量分别对径向强度分布及平均能量不敏感,各参数可以独立地...

[Background] With the development of radiation technology, it needs to improve the accuracy of dose simulation. [Purpose] Build up a simplified benchmarking procedure to determine the incident electron beam parameters independently using a Monte Carlo linear accelerator model. [Methods] A 10 cm×10 cm field is simulated to acquire the parameters influence on the dose distributions for Varian IX 6 MV megavoltage electron beams. [Results] The calculated depth doses had no significant changes when the electron mean energy and radial intensity vari...