直肠癌静态与动态调强放疗计划剂量验证的探讨  

Discussion on Dose Verification of Static and Dynamic IMRT Plans for Rectal Cancer

作　　者：杨玉刚[1] 尚革[1] 齐洪志[1] 郝洁[1] 张华[1] 许林[1] 

机构地区：[1]新疆医科大学第一附属医院肿瘤中心,新疆维吾尔自治区乌鲁木齐830054

出　　处：《中国医疗设备》2014年第9期118-119,共2页China Medical Devices

基　　金：乌鲁木齐市科学技术计划项目资助(H111313001)

摘　　要：目的比较静态和动态调强放疗(IMRT)计划在直肠癌放疗过程中剂量的准确性。方法选取我院12例直肠癌动态IMRT计划和12例直肠癌静态IMRT计划,采用二维电离室矩阵对其进行点剂量和面剂量的验证。结果参照3%/3 mm标准,动态IMRT计划24个照射野以及静态IMRT计划24个照射野的面剂量的γ通过率均值分别为99.2%和97.6%,二者比较差异有统计学意义(P<0.05)。动态和静态IMRT计划点剂量的误差均值分别为1.8%和3.1%,二者比较差异有统计学意义(P<0.05)。结论在加速器正常运行状态下,静态和动态IMRT计划都可以应用于直肠癌调强放射治疗,但在验证剂量精确性上,动态IMRT计划优于静态IMRT计划。Objective To compare the accuracy of radiation dose of static and dynamic IMRT plans in the treatment of recal cancer. Methods The point dose veriifcation and surface dose veriifcation of static IMRT plans （12 cases） and dynamic IMRT plans （12 cases） which were implemented in our hospital were conducted with 2D ionization chamber array. Results According to 3﹪/3 mm criterion, the average passing rate of surface dose of 24 radiation ifelds of dynamic IMRT plans was 99.2%and that of static IMRT plans was 97.6﹪. The mean error of point dose of dynamic IMRT plans was 1.8﹪and that of static IMRT plans was 3.1%. Ther were signiifcant differences between static and dynamic IMRT plans in terms of point dose （P〈0.05） and surface dose （P〈0.05）. Conclusion Based on the normal operation of accelerators, both of static and dynamic IMRT plans can be used in the treatment of rectal cancer while the accuracy of radiation dose of dynamic IMRT plans was higher than that of static IMRT plans.

关 键 词：直肠癌 静态IMRT 动态IMRT 剂量验证 

分 类 号：R816.5[医药卫生—放射医学]