正常脑血流图大都有一个陡直的上升枝和一个倾斜的下行枝,下行枝上有两个重搏波,从外形基本上可以大致确定是否正常。目前一般认为陡直波及没有临床症状的速降波,三峰Ⅰ型均视为正常波。当血管阻塞、受压及周围小血管阻力增强及血管坒因硬化 Most of the normal cerebral blood flow diagram has a steep ascending branch and a tilting descending branch, there are two on the descending branch of the pulse wave, basically from the shape can roughly determine whether the normal. At present, it is generally believed that there is a steep wave of rapid down-going waves without clinical symptoms, and the three-peak type I are regarded as normal waves. When the blood vessels blocked, pressure and the surrounding small blood vessels increased resistance and hardening of the blood vessels