应用AAPM标准模体评估MLC宽度对VMAT计划的影响  

Influence of multileaf collimator leaf width on volumetric modulated arc therapy plans evaluated on AAPM standard phantom

作　　者：黄娜[1] 王培[1] 张德康[1] 唐斌[1] 黎杰[1] 王先良[1] 吴凡[1] 秦远[1] 康盛伟[1] 

机构地区：[1]四川省肿瘤医院放疗科,成都610000

出　　处：《中华放射肿瘤学杂志》2016年第4期376-380,共5页Chinese Journal of Radiation Oncology

基　　金：四川省卫生厅课题（110258）

摘　　要：目的：使用AAPM119报告标准模体和标准靶区设计双弧VMAT计划，依照AAPM119报告剂量目标要求比较Agility和MLCi2两种叶片剂量参数。方法利用AAPM119报告中Cshape、Head and Neck、Prostate和Multitarget标准靶区勾画结构，按照AAPM计划目标要求，首先采用医科达Agility MLC进行计划设计，在计划设计参数不变情况下仅更换为医科达MLCi2进行计划优化和剂量计算。以AAPM119报告目标剂量为标准，分析两种MLC叶片在4种靶区勾画结构下的靶区和OAR剂量体积参数的差异。结果依照AAPM119号报告所达到的平均剂量标准，Cshape、Head and Neck和Multitarget 靶区结构采用Agility制作的放疗计划剂量指标多优于采用MLCi2制作的放疗计划， Prostate靶区结构采用MLCi2制作的放疗计划剂量指标优于采用Agility制作的放疗计划。结论在靶区勾画结构、计划设计人员、计划设计参数和评价标准全部相同下，对严苛剂量限值目标医科达Agility比医科达MLCi2能更好达到剂量目标要求。Objective To develop double-arc volumetric modulated arc therapy （ VMAT） plans using standard phantom and standard target volume in AAPM119 report, and to investigate the dosimetric parameters of Agility and MLCi2 leafs according to the requirements for target dose in AAPM119 report. Methods The Cshape, Head and Neck, Prostate, and Multitarget structures for standard target volume delineation in AAPM119 report were used.The Elekta Agility multi-leaf collimator was used to develop plans, and then with other parameters remaining unchanged, Elekta MLCi2 was used for plan optimization and dose calculation.The target dose in AAPM119 report was used as the standard to analyze the differences in target volume and dose-volume parameters of organs at risk between the four structures for target volume delineation.Results According to the mean dose in AAPM119 report, in the Cshape, Head and Neck, and Multitarget target volumes, the radiotherapy plans developed with Agility had better dosimetric parameters compared with those developed with MLCi2.In the prostate target volume, the radiotherapy plans developed with MLCi 2 had better dosimetric parameters compared with those developed with Agility .Conclusions With the structures for target volume delineation, plan designing personnel, designing parameters, and evaluation criteria remaining the same, Elekta Agility can achieve the dose target better than Elekta MLCi2 in the aspect of strict dose limit.

关 键 词：多叶准直器 叶片宽度 容积调强弧形疗法 剂量学 

分 类 号：R730.55[医药卫生—肿瘤]