[Research Photon Energy Spectrum of Medical Linear Accelerator by Monte Carlo Method].

Q4 Medicine 中国医疗器械杂志 Pub Date : 2024-03-30 DOI:10.12455/j.issn.1671-7104.230387

Yun Xu, Yu Zhao, Zikang Li, Junxiang Wu

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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.

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[用蒙特卡罗方法研究医用直线加速器的光子能量谱]。

研究目的研究医用直线加速器等中心平面的光子能谱分布以及二次准直器对光子能谱的影响。方法使用 BEAMnrc 程序模拟 6 MeV 电子和光子在医用直线加速器治疗头 5 cm×5 cm、10 cm×10 cm、15 cm×15 cm 和 20 cm×20 cm 场中的传输，在等中心平面建立相空间文件，记录通过该平面的粒子信息。使用 BEAMdp 程序对相空间文件进行分析，以获得等中心平面的光子能谱分布以及二次准直器对光子能谱的影响：通过分析标称能量为 6 MV 的医用直线加速器的光子能谱，发现二次准直器对光子能谱的影响很小；不同场的光子能谱分布不同；同一场不同中心区域的光子能谱具有相同的归一化分布：结论：在放射治疗的剂量计算中，应仔细考虑光子能谱的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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