目的：检验低熔点铅挡块的制作是否符合常规放射治疗的要求及其质量保证和质量控制的方法。

Objective To detect whether the make of the low melting-point lead block coincides with the request of routine radiation treatment and check the quality control of this method.

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目的探讨低熔点铅不规则挡块等中心治疗在鼻咽癌放疗中的价值。

Objective To evaluate the radiotherapy effects on nasopharyngeal carcinoma with low-melting-point lead irregular shield technique.

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