胸部肿瘤放疗两种体膜固定方法的摆位精度分析

目的 通过对胸部肿瘤放疗体膜固定方法的改进，进一步提高胸部肿瘤放疗摆位精度。方法 将50例胸部肿瘤患者随机均分至常规体膜固定组(常规组，无电极贴)和改良体膜固定组(改良组，电极贴)。使用模拟机验证片与治疗计划系统的数字重建射野图像，对两种不同体膜固定方法的摆位精度差异进行成组t检验。结果 常规组和改良组左右、上下、前后方向摆位误差分别为2.5±1.5和2.4±1.4(P=0.010)、4.4±2.0和2.2±1.2(P=0.000)、2.2±1.3和2.1±1.0(P=0.100)。结论 改良体膜固定法与常规体膜法相比提高了放疗重复摆位精度，具有临床推广价值。

Analysis of set-up accuracy of two body membrane fixation methods in radiotherapy for thoracic neoplasms

Objective To study the set-up accuracy in radiotherapy of thoracic neoplasms by improving the body immobilization method. Methods Fifty patients with thoracic neoplasms were randomly divided into conventional group (without electrode paste) and improved group (with electrode paste). Using simulator for position calibration and center field digital image reconstruction from treatment planning system.Then compare the set-up accuracy of two groups with different body methods by grouped t-test. ResultsSet-up error in the left-right, superior-inferior, anterior-posterior direction were 2.5±1.5 and 2.4±1.4(P=0.010),4.4±2.0 and 2.2±1.2(P=0.000),2.2±1.3 and 2.1±1.0(P=0.100) in conventional group and improved group,respectively. Conclusions The improved body immobilization method improves setup accuracy in radiotherapy for thoracic neoplasms which also will be effective for clinical treatment.