放疗是治疗鼻咽癌的首选方法,但头颈部是活动易变的部位。因此,要使照射剂量准确和质量保证,照射时的体位和照射部位的固定是关键环节。自1997年下半年起,我科用面膜固定水平照射技术治疗了20例鼻咽癌患者,效果好,现介绍如下。1　材料与方法1.1　面膜固定装置:该装置由一?.. Radiotherapy is the preferred method of treatment of nasopharyngeal carcinoma, but the head and neck is a site of variable activity. Therefore, in order to ensure accurate dose and quality assurance of radiation dose, the irradiation of the body position and the irradiation site is the key link. Since the second half of 1997, our department has treated 20 patients with nasopharyngeal carcinoma with fixed horizontal mask irradiation, and the results are as follows. 1 Materials and Methods 1.1 Mask Fixing Device: The device consists of a?