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照射野挡铅是肿瘤放射治疗中的常规。除日产三菱加速器机头带有（多叶光栏）电脑控制，可任选不同的角度进行不规则野挡铅治疗。而对于大多数进口和国产加速器均无法倾斜机架角度直接加铅挡块进行不规则野的照射治疗。我院使用WD－6MV加速器开展倾斜机架挡铅治疗鼻咽癌的不规则
Irradiation field block lead is routine in cancer radiotherapy. In addition to the Nissan Mitsubishi accelerator head with (multi-leaf light) computer control, can choose different angles for the wild stalk lead treatment. For most imported and domestically produced accelerators, it is impossible to tilt the frame angle directly with lead block for irregular field irradiation treatment. WD-6MV accelerator in our hospital to carry out tilt rack lead to treat irregular nasopharyngeal carcinoma