应用医用电子直线加速器治疗肿瘤,除采用常见的固定源皮距(SSD)放射治疗外,还有等中心(SAD)照射技术、旋转(ROT)照射技术等特殊治疗手段。我院自1991年初开展了对食管癌采取等中心放射治疗技术。作者的初步体会是,与以往的固定源皮距放射治疗相比,食管癌等中心放射治疗技术具有准确性高、摆位重复性好、操作简便等优 The application of medical linear accelerator in the treatment of cancer, in addition to using a common fixed source distance (SSD) radiation therapy, there are other centers (SAD) irradiation technology, rotation (ROT) irradiation technology and other special treatment. In our hospital since early 1991 to carry out the center of esophageal cancer radiotherapy technology. The author’s initial experience is that, compared with the previous fixed source skin radiotherapy, esophageal cancer center radiotherapy technology with high accuracy, good positioning repeatability, easy to operate, etc.