放射治疗是治疗鼻咽癌的主要方法。鼻咽癌腔内近距离放射治疗（后装放射治疗）是体外照射的补充手段，但仍存在以下问题：（１）腔内放射治疗只适用于鼻咽腔内的浅表病变，对于咽旁间隙、蝶窦、筛窦受累者难以奏效；（２）从腔内施源器置入技术来看，其固定方法、与软腭的距离 Radiation therapy is the main method of treatment of nasopharyngeal carcinoma. Nasopharyngeal carcinoma intracavitary brachytherapy (post-radiation therapy) is a supplementary means of external irradiation, but there are still the following problems: (1) intracavitary radiation therapy is only applicable to the nasopharyngeal superficial lesions, for the parapharyngeal Gap, sphenoid sinus, ethmoid sinus involvement is difficult to work; (2) from the intracavity device into the technology point of view, the fixed method, and the distance of the soft palate