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目的:探讨使用真空垫在减小宫颈癌放射治疗摆位误差。方法:选择宫颈癌患者20例,其中10例使用真空垫固定,10例未使用真空垫,均取仰卧位,在模拟定位机下源轴距定位实施等中心治疗。放疗期间每2周模拟机上按治疗条件复位,将验证体位重复性的野图像与初次计划时的定位图像进行比较。结果:通过20例患者的重复校野图像和初次定位图像的对比,得出同一解剖骨性标志点在X,Z轴方向上的位移值分别为(10.20±2.6)mm,(7.10-1.3)mm。结论:使用真空垫固定在宫颈癌普通放疗摆位误差减小,且简便、安全、可行。
Objective: To explore the use of vacuum pad in the reduction of cervical cancer radiotherapy placement error. Methods: Twenty patients with cervical cancer were selected. Among them, 10 patients were treated with vacuum pad and 10 patients without vacuum pad. All the patients were supine. Every 2 weeks during radiotherapy, the simulator was reset according to the treatment conditions, and the repeated images of the field of position verification were compared with the images of the initial planning. Results: The displacement values of X-axis and Z-axis in the same anatomical bone marker were (10.20 ± 2.6) mm and (7.10-1.3) respectively from the images of repeated field images and initial images of 20 patients. mm. Conclusion: The use of vacuum pad fixation in cervical cancer radiotherapy setting error reduction, and simple, safe and feasible.