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[目的]探讨在鼻咽癌放射治疗模拟定位过程中,面罩制作对耳前野与颈切线野之间衔接的影响。[方法]将准备进行鼻咽癌放疗计划设计的病人随机分成两组,A组病人用平常模拟定位设计的办法并摄取定位片;B组病人待面膜制作完成后起身休息片刻,再进行照射野的设计工作并摄取定位片。两组病人在照射野设计完成后,再以颈切线野的设计条件重新摄取一张体位验证片,将同一病人颈切线野的定位片与验证片进行比较。[结果]A组共有病例34例,发生体位偏差>±2mm的有13例,占38.2%;B组共有病例30例,发生偏差>±2mm的仅有4例,占13.3%,两组差异有统计学意义。B组病人的耳前野与颈切线野有较好的衔接。[结论]热塑面膜是一种很好的体位固定工具,但不能忽略它具有的收缩性能,在模拟定位时尽量将面膜的制作与照射野的设计分步进行,以减少不必要的误差产生。
[Objective] To explore the effect of mask making on the interface between the anterior field of the ears and the neckline of the neck during the radiotherapy of nasopharyngeal carcinoma. [Methods] The patients who were planning the radiotherapy of nasopharyngeal carcinoma were divided into two groups at random. The patients in group A were treated with the usual simulation and positioning method. The patients in group B got up and took a rest after the mask was made, The design work and intake positioning film. Two groups of patients in the irradiation field design is completed, and then the design conditions of the neck cut line wild re-up a body position verification piece, the same patient neck line field positioning film and verification films were compared. [Results] A total of 34 cases occurred in group A, there were 13 cases (38.2%) with deviation> ± 2 mm. There were 30 cases in group B, only 4 cases (deviation ± 2 mm) accounted for 13.3% There is statistical significance. B group of patients with the ear field and neck tangent line better convergence. [Conclusion] The thermoplastic mask is a good tool to fix the position, but it can not ignore its shrinking performance. When making the simulated positioning, the mask making and the design of the irradiation field should be carried out step by step so as to reduce the unnecessary error .