胰头部肿瘤因离肠道及肝脏较近，一般采用三野或四野技术；

For the tumors in the head of the pancreas which near to the intestine and liver, four-field or three-field crossing are usually applied;

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综合考虑对脊髓和肺的影响，三野计划为食管癌适形放疗的较优方案。

Three beam scheme is the optimal choice of conformal radiotherapy plan for esophageal carcinoma as concerning the dose distribution to lung and spinal cord.

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方法：对217例经“三野”淋巴结清除根治术的食管癌患者的临床资料进行回顾性分析。

METHODS: a retrospective study was performed on the clinical data of 217 patients who had underwent radical operation through three-field lymphadenectomy.

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