Background &Objectives:It was difficult to get a good tissued ose distribution using fixed field irradiation technique in large field. But the translating scanning beam irradiation can make it.
背景与目的：用固定野技术行特大野照射时，很难得到理想的组织剂量分布，而平移扫描式照射却能做到。
Background and objective brain irradiation is the traditional treatment for NSCLC patients with brain metastases, whereas combined with chemotherapy is the nowadays treatment direction.
背景与目的脑放疗是非小细胞肺癌脑转移的传统治疗，化疗与脑放疗的联合是近年的研究方向。
Background and objective brain irradiation is the traditional treatment for NSCLC patients with brain metastases, whereas combined with chemotherapy is the nowadays treatment direction.
背景与目的脑放疗是非小细胞肺癌脑转移的传统治疗，化疗与脑放疗的联合是近年的研究方向。
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