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颈段食道癌由于颈部的活动度较大 ,颈部与肩部的组织厚度差异较大 ,因此其定位精度、摆位的重复性及射野内剂量的均匀性较差 ,使此部位肿瘤的放射治疗疗效受到一定的影响。虽然目前有颈肩部真空固定垫和颈肩部高分子塑料固定架解决了定位和摆位的精度 ,但未能解决颈肩部组织厚
Cervical esophageal cancer due to the greater mobility of the neck, neck and shoulder tissue thickness of the larger differences, so its positioning accuracy, placement repeatability and radio field dose uniformity is poor, so that part of the tumor The efficacy of radiation therapy is affected to some extent. Although there are neck and shoulder vacuum pads and neck and shoulder polymer plastic fixtures to solve the positioning and positioning accuracy, but failed to solve the neck and shoulder tissue thickness