高分辨多叶准直器HD-MLC的Edge加速器TPS模型建立及测试  

Commissioning and testing of treatment planning system model of an Edge accelerator with a highdefinition multi-leaf collimator

作　　者：马阳光[1] 王涛[1] 胡金炎[1] 张征 王芳娜[1] 王学敏 郭跃信[1] Ma Yangguang;Wang Tao;Hu Jinyan;Zhang Zheng;Wang Fangna;Wang Xuemin;Guo Yuexin(Department of Radiation Oncology,First Affiliated Hospital of Zhengzhou University,Zhengzhou 450052,China;Department of Radiotherapy Hospital Unit Rddialion Therapy,Shanxi Provincial Tumor Hospital,Xi'an 710061,China)

机构地区：[1]郑州大学第一附属医院放射治疗部,450052 [2]陕西省肿瘤医院放疗医院放射治疗区,西安710061

出　　处：《中华放射肿瘤学杂志》2019年第2期113-118,共6页Chinese Journal of Radiation Oncology

基　　金：河南省医学科技攻关计划项目(201602035);河南省科技厅科技攻关计划(182102310369);河南省医学科技攻关项目(201303043).

摘　　要：目的探讨配备HD-MLC的Edge加速器Eclipse模型建立与测试.方法利用Razor、CC13采集小野百分深度剂量、离轴曲线、输出因子并与标准数据比对。使用EBT3、EP1D、SRS1000&SRS1500测量MLC半影、穿射漏射、凹凸槽、到位准确性,MLG,并根据测试例γ通过率选出最佳DLG/透射率值利用FC65-G对规则野、IMKT、VMAT病例行点剂量验证。使用Octavius4D及EBT3对测试例行面剂量验证t结果实测PDD与标准数据一致。3、4cm射野半影较标准值小,6 cm的较标准值大。所有方野左右边界、射野大小、射野中心偏差分布为0.009~0.4mm、0.2~1.7mm、-0.3~1.9mm、-0.1~0.8mm。左、右MLC在不同位置处的半影平均值分别为(2.5±0.042)、(2.7±0.005)mm;MLC透射率分布为0.009-0.016:.测得的DLG、透射因子分別为0.1861cm、0.0116,最佳DLG、透射因子分别为0.015cm、0.014除1例位于低剂量区外,其余所有测试点剂量偏差均位于±3%内IMKT面剂14验证局部、全局γ通过率分别为79.81%~100%、96.3%~100%(3%/3mm),VMAT病例上述通过率分别为71.3%~98.9%、94.3%~99.8%。结论本研究方法能准确地实施HDMLC&Kdge系统Eclipse模型建立与测试。Objective rFo investigate the commissioning and testing of the Eclipse model of an Edge accelerator with high-definition multi-leaf collimator(HD-MLC).Methods The percentage depth dose(P D D),profile,output factor measured by Razor and CC13 were statistically compared with the standard data.Penumbra,transmission factor(TF),leakage,concave-convex groove,accuracy of movement and dosimetry leaf gap(DLG)were measured with EBT3.electronic portal image device(EPID)and PTW SRS1000&SRS1500.The optimal DLG/TF was acquired when the 7 pass rate of test cases was the highest.The point dose of regular fields,intensily-modulated radiation therapy(1MRT)and volume-modulated radiation therapy(VMAT)was verified with FC65-G.The planar dose of these case was verified with Octavius 41)and EBT3.Results The measured PDI)data were consistent with the standard data.The measured penumbra of 3 c;m and 4 cm square fields was smaller,whereas that of 6 cm square field was larger than the standard values.The left and right edge,field size,center of the field were distributed within the range of-1.0-0.4 mm,0.2-1.7 mm,-0.3-1.9 mm and-0.1-0.8 mm,respectively.Fhe mean penumbra of the left and right MLC in different positions were(2.5±0.042)mm and(2.7±0.005)mm.The1 leakage of MLC was 0.009-0.016.The measured DLG/TF was 0.1861 cm/0.0 116 and the optimal DLG/TF was 0.015 cm/0.014.The differences of point dose of all the test cases except the one which was in the low-dose area were within±3%.Local and global 7 pass rates of all 1MRT were 79.81%_100%and 96.3%-100%(3%/3 mm),71.3%-98.9%and 94.3%-99.8%for VMAT cases.Conclusions This method can accurately test and commission the Eclipse treatment planning model of Edge Linac equipped with HD-MLC.

关 键 词：汁划系统模型验收 小野测量 HD-MLC特征参数测试 Edge加速器 

分 类 号：R730.55[医药卫生—肿瘤]