Ｘ－刀是近年国内外用于治疗肿瘤的一项先进技术，其本质是用一种特殊形式的放疗手段达到如同刀切的效果。为非手术治疗肿瘤病变开辟了新途径。在进行Ｘ－刀治疗前必须经ＣＴ准确的定位扫描，它与诊断性扫描有所不同，扫描技术以定位为目的，对操作技术有严格要求。正确的扫描 X-knife in recent years at home and abroad for the treatment of advanced cancer technology, its essence is to use a special form of radiotherapy to achieve the same effect as knife. Non-surgical treatment of tumor lesions opened up a new way. Before the X-knife treatment must be accurate positioning of the CT scan, which is different from the diagnostic scan, scanning technology to locate for the purpose of the operation of the technology have strict requirements. Correct scanning