摘要
目的:评价体部肿瘤三维适形调强放射治疗(IMRT)的皮肤定位标记与体膜定位标记两种摆位方法的精度差别。方法:将100例体部肿瘤调强放疗的患者随机分为皮肤定位标记和体膜定位标记两组,分别在模拟定位机和治疗加速器上按治疗要求进行体膜固定摆位,并拍摄正侧位XR(模拟机)或EPID(加速器)验证照片,各自与相应的治疗计划DRR图像比较测定治疗靶区中心点在三维方向上的摆位误差。结果:EPID照片验证结果,皮肤定位标记和体膜定位标记法摆位精度在X、Y、Z三个方向上的合格率(误差≤2mm)分别为X 94.1%、Y 92.1%、Z 96.0%和X 75.5%、Y 73.4%、Z 87.7%(P<0.05);XR照片验证也得到类似结果。结论:在相同的体膜固定条件下,皮肤定位标记摆位的精度优于体膜定位标记方法。
Objective： To evaluate and compare the accuracy of two different marking methods in IMRT （Intensive Modulate Radiotherapy） for body tumors. Methods： 100 patients with body tumors were randomized into two groups： one group （51 patients） was given the skin marking method and the body film marking was applieated on another group （49 patients）. Body film fixed position was adopted on simulator system and electronic portal imaging device （EPID） separately according to the treatment requirement. Tes- ting anterioposterior and lateral film were taken to compare with the DRR imaging and to measure the set-up error on three dimensional directions. Results： In the X direction, the set-up accuracy of patients was 94.1% and 75.5% for the skin marking method and the body film marking method respectively （ P 〈 0.05 ）. In the Y direction, it was 92.1% and 73.4% respectively （ P 〈 0.05 ）. In the z direction, the set-up accuracy of patients was 96.0% and 87.7% for the two methods respectively（ P 〈 0.05 ）. Conclusion： The skin marking method is superior to the body film marking method under the same body film fixed conditions.
出处
《肿瘤预防与治疗》
2011年第3期182-184,共3页
Journal of Cancer Control And Treatment
基金
图像引导肿瘤放疗的智能跟踪系统研究(省科委科技支撑:编号05SG0932)
体部肿瘤精确放疗摆位误差研究(省卫生厅:编号0070033)
关键词
体部肿瘤
调强放疗
定位标记法
摆位误差
Body Tumor
Intensive Modulate Radiotherapy
Marking Method
Set-up Error
