BEAM - A MONTE-CARLO CODE TO SIMULATE RADIOTHERAPY TREATMENT UNITS
BEAM - A MONTE-CARLO CODE TO SIMULATE RADIOTHERAPY TREATMENT UNITS
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DOI：
10.1118/1.597552
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发表时间：
1995-05-01
期刊：
影响因子：
3.8
通讯作者：
MACKIE, TR
中科院分区：
文献类型：
--
作者：
ROGERS, DWO;FADDEGON, BA;MACKIE, TR
本文描述了BEAM，一个通用的蒙特卡罗程序，用于模拟放射治疗单元的辐射束，包括高能电子束和光子束，60 Co束和正电压单元。代码处理用户根据需要放在一起的各种基本几何实体（钳口、施用器、堆叠的锥体、镜子等），从而允许模拟各种各样的加速器。该代码不限于圆柱对称。它结合了各种强大的方差减少技术，如距离拒绝，韧致辐射分裂和强迫光子相互作用。该代码允许直接计算监测离子室中的电荷。它具有跟踪每个颗粒的历史并使用该信息来对单独的剂量组分（例如，以确定从施加器散射的电子的剂量）。本文提出了各种计算结果来证明代码的能力。由NRC 35 MeV研究加速器、Varian Clinac 2100 C、Philips SL 75 - 20、AECL Therac 20和Scanditronix MM 50的电子束照射的水模体中计算的剂量分布均显示出与测量值在2至3%的水平上良好一致。十八电子光谱从四个不同的商业加速器和各个方面的电子束从Clinac 2100 C进行了讨论。时间要求和选择参数的Monte Carlo calculations.Dedication：本文是专门为我们的朋友和同事，魏建苏，谁作出了重大贡献，这个项目的记忆之前，他去世于1993年3月15日。
This paper describes BEAM, a general purpose Monte Carlo code to simulate the radiation beams from radiotherapy units including high‐energy electron and photon beams,60Co beams and ortho‐voltage units. The code handles a variety of elementary geometric entities which the user puts together as needed (jaws, applicators, stacked cones, mirrors, etc.), thus allowing simulation of a wide variety of accelerators. The code is not restricted to cylindrical symmetry. It incorporates a variety of powerful variance reduction techniques such as range rejection, bremsstrahlung splitting and forcing photon interactions. The code allows direct calculation of charge in the monitor ion chamber. It has the capability of keeping track of each particle's history and using this information to score separate dose components (e.g., to determine the dose from electrons scattering off the applicator). The paper presents a variety of calculated results to demonstrate the code's capabilities. The calculated dose distributions in a water phantom irradiated by electron beams from the NRC 35 MeV research accelerator, a Varian Clinac 2100C, a Philips SL75‐20, an AECL Therac 20 and a Scanditronix MM50 are all shown to be in good agreement with measurements at the 2 to 3% level. Eighteen electron spectra from four different commercial accelerators are presented and various aspects of the electron beams from a Clinac 2100C are discussed. Timing requirements and selection of parameters for the Monte Carlo calculations are discussed.Dedication:This paper is dedicated to the memory of our friend and colleague, Jiansu Wei, who made a significant contribution to this project before he passed away on March 15, 1993.