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[目的]探讨鼻咽癌放射治疗两种不同固定方法摆位误差值的大小 ,为设计PTV提供参考数据。[方法]面膜固定组20例 ,泡沫枕尼龙带固定20例 ,按放疗处方规范摆位 ,每周在模拟机下拍片一次 ,与定位片比较误差大小。[结果]等中心点误差值面膜组为(0.94±1.47)mm,泡沫枕尼龙带固定组为(1.38±1.94)mm。[结论]①面膜组摆位误差明显低于普通组(P<0.01) ;②设计PTV时 ,不同固定方法 ,预留范围应有所区别 ,面膜组可定为3mm ,普通组为5mm。以免漏照射或造成不必要照射
[Objective] The purpose of this study was to investigate the placement error values of two different fixation methods for radiotherapy of nasopharyngeal carcinoma, and to provide reference data for the design of PTV. [Method] 20 cases of mask fixation group and 20 cases of foam pillow fixation nylon band were set according to prescription of radiotherapy. The film was taken under the simulator once a week, compared with that of the positioning film. [Result] The error of the center point was (0.94 ± 1.47) mm in the mask group and (1.38 ± 1.94) mm in the nylon foam fixation group. [Conclusion] ① The setup error of the mask group was significantly lower than that of the normal group (P <0.01). ② When designing the PTV, the different fixation methods and the reserved range should be different. The mask group can be set as 3mm and the normal group as 5mm. To avoid leakage or cause unnecessary exposure