比较适形放射治疗中移动中心位置对多叶准直器宽度的影响  

Effections of the width of multileaf collimation during moving the isocenter point in the three dimensional conformal radiotherapy

作　　者：余增荣[1] 谭洁媚[1] 

机构地区：[1]529070,广东省江门市中心医院肿瘤科,广东,江门 529070,广东省江门市中心医院肿瘤科,广东,江门

出　　处：《现代医学仪器与应用》2005年第2期7-10,共4页

摘　　要：目的:拟用在三维适形放射治疗过程中移动等中心位置,提高靶区适形度,改善多叶准直器在等中心处的叶片宽度.方法:CT模拟,TPS计划系统,选取10个头颈部肿瘤患者,分别用三种方法:固定等中心,多叶准直器适形(A);移动等中心5mm,多叶准直器适形,移动前后剂量比1:1(B);固定中心,铅挡适形(C).结果:从靶区适形度和危及器官的受照射量进行比较,移动治疗中心位置对多叶准直器的治疗宽度有一定的改善.结论:移动治疗中心位置可改善靶区的适形度及危及器官的受照射剂量.Purpose: Moving the radiotherapy isocenter point during the three dimensional conformal radiotherapy, promoting the target volume rate (TVR) and improving the leaf width in the isocenter position of the multileaf collimation (MLC). Methods and materials: Computed tomography (CT) simulation, therapy planning system (TPS), 10 head-and-neck cancer patients were selected, using three methods on each patient: Holding isocenter point, using MLC to cover the field size(A); Moving isocenter point 5mm, using MLC to cover the field size(B); Holding isocenter point, using block to cover the field size(C). Results: From the comparison of the target volume rate (TVR) and the dosimetry of the organ at risk (OAR), moving the isocenter point can improve the MLC width in radiotherapy. Conclusion: Moving the isocenter point can improve the target volume rate (TVR) and reduce the dose of the organ at risk(OAR).

关 键 词：多叶准直器 适形度 剂量比 适形放射治疗 

分 类 号：R197.3[医药卫生—卫生事业管理]