颈动脉狭窄是短暂性脑缺血发作、脑卒中等神经系统症状的重要原因。近年来 ,开展的颈动脉内膜剥脱术 ,以及经皮血管成形术与内支架治疗技术 ,可以显著减少脑梗死的发生率 ,改进预后[1] 。所以 ,颈动脉颅外段病变的早期诊断日益迫切。颈部血管垂直走向 ,呼吸等运动容易控制 ,Ｃ Carotid stenosis is a major cause of neurological symptoms such as transient ischemic attack and stroke. In recent years, carotid endarterectomy, as well as percutaneous angioplasty and stent treatment technology, can significantly reduce the incidence of cerebral infarction and improve prognosis [1]. Therefore, the early diagnosis of carotid extracranial lesions is increasingly urgent. Vascular vertical direction of the neck, breathing and other sports easy to control, C