头颈部常见肿瘤放疗疗效的提高,除治疗计划设计科学合理外,重复正确的摆位是治疗计划实施的第一保证。头颈部活动度大,难以固定。资料表明,在治疗过程中,若三分之一射野偏差0.5cm,疗效则降低20％。为了提高疗效,我们在工作实践中,通过对头颈部肿瘤射野合理摆位的探索,积累一些经验,体会如 The improvement of the curative effect of common tumor radiotherapy for the head and neck, in addition to the scientific and rational design of the treatment plan, the repetition of the correct placement is the first guarantee for the implementation of the treatment plan. Head and neck activity is difficult to fix. The data show that if one-third of the field deviation is 0.5cm during treatment, the curative effect is reduced by 20%. In order to improve the efficacy, we have accumulated experience and experience through our exploration of the reasonable placement of the head and neck tumors in our work practices.