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适形放疗和调强放疗在头颈部肿瘤中的应用对靶区的精确界定提出了更加严格的要求。目前临床放疗医师一般按ICRU 5 0号[1] 报告定义将靶体积分为GTV、CTV和PTV。鼻咽部肿瘤因受颅底结构的限制 ,PTV外扩范围大小主要决定于摆位误差。笔者介绍自行设计的“牙合 垫内置标记点法(牙
The application of conformal radiotherapy and intensity modulated radiotherapy in head and neck cancer places more stringent requirements on the precise definition of the target area. At present, clinical radiologists generally classify the target volume into GTV, CTV and PTV according to the definition of ICRU 50 [1] report. Nasopharyngeal tumor due to the structure of the skull base constraints, PTV size range of the main expansion depends on the positioning error. The author introduced their own design "occlusal pad built-in point method (tooth