The optimal radiation target volume must cover all the high risk area.Idealized field should be modified accordingly to the method of surgery, tumor location, and pathologic feature.

• 但是上腹腔有很多器官对放射线的耐受度很低，因此必须依据原发肿瘤的部位、外科手术的方式、肿瘤的大小、侵犯的深度与淋巴结转移的情形，来修正治疗范围。