[1]唐华南,陈蕾,傅玉川,等.利用蒙特卡罗模拟比较医用电子直线加速器均整模式和非均整模式下光子束的半影分布特性[J].中国医学物理学杂志,2023,40(9):1069-1074.[doi:DOI:10.3969/j.issn.1005-202X.2023.09.003]
　TANG Huanan,CHEN Lei,FU Yuchuan,et al.Monte Carlo simulation and comparison for the penumbra characteristics of flattening filter and flattening filter free photon beams from medical electron linear accelerator[J].Chinese Journal of Medical Physics,2023,40(9):1069-1074.[doi:DOI:10.3969/j.issn.1005-202X.2023.09.003]
点击复制

利用蒙特卡罗模拟比较医用电子直线加速器均整模式和非均整模式下光子束的半影分布特性()
分享到：

《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
40卷
期数:
2023年第9期
页码:
1069-1074
栏目:
医学放射物理
出版日期:
2023-09-26

文章信息/Info

Title:
Monte Carlo simulation and comparison for the penumbra characteristics of flattening filter and flattening filter free photon beams from medical electron linear accelerator
文章编号:
1005-202X（2023）09-1069-06
作者:
唐华南1; 陈蕾2; 傅玉川1; 李长虎1; 韩纪锋2
1.四川大学华西医院肿瘤中心/放射物理技术中心， 四川 成都 610041； 2.四川大学原子核科学技术研究所/辐射物理及技术教育部重点实验室， 四川 成都 610064
Author(s):
TANG Huanan1;  CHEN Lei2;  FU Yuchuan1;  LI Changhu1;  HAN Jifeng2
1. Radiotherapy Physics & Technology Center/Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China 2. Key Laboratory of Radiation Physics and Technology, Ministry of Education/Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
关键词:
均整模式; 非均整模式; 蒙特卡罗模拟; 医用直线加速器; 半影
Keywords:
Keywords: flattening filter mode flattening filter free mode Monte Carlo simulation medical electron linear accelerator penumbra
分类号:
R318；R811.1
DOI:
DOI:10.3969/j.issn.1005-202X.2023.09.003
文献标志码:
A
摘要:
目的：通过蒙特卡罗模拟对比分析不同能量条件下光子均整（FF）射束和非均整（FFF）射束的半影分布特性。方法：利用BEAMnrc程序构建医科达Versa HD加速器FF模式和FFF模式下的机头模型，同时使用DOSXYZnrc程序建立标准水箱模型，模拟计算不同模式、不同打靶电子能量下的光子束在标准水模中的百分深度剂量（PDD）和射野离轴比（OAR），并与测量数据进行对比，确定不同模式下光子束的打靶电子能量。对FF射束采用射束中心轴剂量20%~80%之间的宽度计算半影，对FFF射束采用Ponisch方法计算半影，比较不同射束的半影宽度。结果：相同打靶电子能量条件下，6 MV FFF射束的半影相较于6 MV FF射束更锐利，但随着射野尺寸的增大，FFF射束的半影优势逐渐消失。当打靶电子能量提高到7.0 MeV时，6 MV FFF射束的半影与6 MV FF射束的半影趋于一致。对于10 MV FF和10 MV FFF射束，小野时FFF射束半影有明显优势。结论：打靶电子能量是决定不同射束半影特性的主要因素。
Abstract:
Abstract: Objective To analyze the penumbral characteristics of flattening filter (FF) and flattening filter free (FFF) photon beams under different energy conditions using Monte Carlo simulation. Methods BEAMnrc program was used to model Elekta Versa HD accelerator head in FF mode and FFF mode, and DOSXYZnrc program to build the standard water tank model. The percentage depth dose (PDD) and off-axis ratio (OAR) of the photon beam in the standard water model under different modes and different incident electron energies were simulated and compared with the measurement data to determine the incident electron energy of the photon beam in different modes. For FF beam, the width between 20% and 80% of the beam center axis dose was used to calculate the penumbral and for FFF beam, the penumbral was calculated with Ponisch method. The penumbral widths of different beams were compared. Results With the same incident electron energy, the penumbra of 6 MV FFF beam was sharper than that of 6 MV FF beam, but the penumbra advantage of FFF beam gradually disappeared with the increase of the field size. When the incident electron energy was increased to 7.0 MeV, the penumbra of 6 MV FFF beam tended to coincide with that of 6 MV FF beam. For 10 MV FF and 10 MV FFF beams, FFF beam penumbra had obvious advantages for small filed. Conclusion Incident electron energy is the main factor determining the characteristics of different beam penumbras.

相似文献/References:

[1]刘卓伦,张艺宝,岳海振,等.医用直线加速器中心轴绝对剂量输出长期稳定性对比分析[J].中国医学物理学杂志,2016,33(1):1.[doi:DOI:10.3969/j.issn.1005-202X.2016.01.001]
　[J].Chinese Journal of Medical Physics,2016,33(9):1.[doi:DOI:10.3969/j.issn.1005-202X.2016.01.001]
[2]岳海振,张艺宝,胡俏俏,等.PTW 1000SRS与729矩阵在非均整模式下剂量验证对比[J].中国医学物理学杂志,2016,33(1):19.[doi:DOI:10.3969/j.issn.1005-202X.2016.01.005]
　[J].Chinese Journal of Medical Physics,2016,33(9):19.[doi:DOI:10.3969/j.issn.1005-202X.2016.01.005]
[3]吴丽丽,张基永,黄宝添,等. 非均整模式光子线在乳腺癌调强放疗的剂量学评估[J].中国医学物理学杂志,2017,34(11):1086.[doi:DOI:10.3969/j.issn.1005-202X.2017.11.002]
　WU Lili,ZHANG Jiyong,HUANG Baotian,et al. Evaluation of intensity-modulated radiotherapy using flattening filter free photon beams for patients with breast cancer[J].Chinese Journal of Medical Physics,2017,34(9):1086.[doi:DOI:10.3969/j.issn.1005-202X.2017.11.002]
[4]王占宇,谭军文,龙雨松,等. 非均整与均整模式下宫颈癌容积旋转调强放疗计划的剂量学比较[J].中国医学物理学杂志,2017,34(11):1110.[doi:DOI:10.3969/j.issn.1005-202X.2017.11.007]
　WANG Zhanyu,TAN Junwen,LONG Yusong,et al. Dosimetric comparison of VMAT plans in different modes for cervical cancer: flatting filter free vs flattening filter[J].Chinese Journal of Medical Physics,2017,34(9):1110.[doi:DOI:10.3969/j.issn.1005-202X.2017.11.007]
[5]姚凯宁,王若曦,岳海振,等.AAA和PDIP算法在非均整模式容积调强放射治疗剂量预测方面的差异[J].中国医学物理学杂志,2020,37(4):419.[doi:DOI:10.3969/j.issn.1005-202X.2020.04.005]
　YAO Kaining,WANG Ruoxi,YUE Haizhen,et al.Differences between anisotropic analytical algorithm and portal dose image prediction algorithm in dose prediction in volumetric modulated arc therapy using flattening filter free beams[J].Chinese Journal of Medical Physics,2020,37(9):419.[doi:DOI:10.3969/j.issn.1005-202X.2020.04.005]
[6]岳海振,张艺宝,刘卓伦,等. 直线加速器均整和非均整模式下射线质和射野输出因子的蒙特卡罗模拟与实测值比较[J].中国医学物理学杂志,2016,33(6):548.[doi:DOI:10.3969/j.issn.1005-202X.2016.06.002]
　[J].Chinese Journal of Medical Physics,2016,33(9):548.[doi:DOI:10.3969/j.issn.1005-202X.2016.06.002]
[7]岳海振,张艺宝,张健,等. 基于蒙特卡罗方法的光子束均整与非均整模式能谱对比分析[J].中国医学物理学杂志,2018,35(6):633.[doi:DOI:10.3969/j.issn.1005-202X.2018.06.003]
　YUE Haizhen,ZHANG Yibao,ZHANG Jian,et al. Comparison analysis of energy spectra between flattened and flattening-filter-free Monte Carlo models for photon beam[J].Chinese Journal of Medical Physics,2018,35(9):633.[doi:DOI:10.3969/j.issn.1005-202X.2018.06.003]
[8]韩俊杰,陈立新,朱金汉,等.Varian Edge均整和非均整模式下6 MV和10 MV光子线能谱研究[J].中国医学物理学杂志,2018,35(9):997.[doi:DOI:10.3969/j.issn.1005-202X.2018.09.002]
　HAN Junjie,CHEN Lixin,ZHU Jinhan,et al.Energy spectra of 6 and 10 MV flattened and flattening filter-free photon beams from Varian Edge[J].Chinese Journal of Medical Physics,2018,35(9):997.[doi:DOI:10.3969/j.issn.1005-202X.2018.09.002]
[9]时颖华,葛超,王利波,等. 均整与非均整模式下TrueBeam加速器治疗床对放疗剂量的影响[J].中国医学物理学杂志,2019,36(8):867.[doi:DOI:10.3969/j.issn.1005-202X.2019.08.001]
　SHI Yinghua,GE Chao,WANG Libo,et al. Effects of carbon fiber couch of TrueBeam accelerator in flattening filter-free and flattening filter modes on radiotherapy dose[J].Chinese Journal of Medical Physics,2019,36(9):867.[doi:DOI:10.3969/j.issn.1005-202X.2019.08.001]

备注/Memo

备注/Memo:
【收稿日期】2023-04-26 【基金项目】四川省科技计划重点研发项目（2020YFS0274） 【作者简介】唐华南，研究方向：放射治疗物理技术，E-mail: 2515362532@qq.com 【通信作者】傅玉川，研究方向：医学物理与辐射防护，E-mail: ychfu@hotmail.com
更新日期/Last Update: 2023-09-26