The positive rate of TCD examination,DCCU,MRA,DSA and CTA were 71%,62%,60%,96% and 92% respectively.

• VBI患者TCD检查阳性率为71%25,颈部血管彩超阳性率为62%25,颅脑MRA阳性率为60%25,DSA检查阳性率为96%25,颅脑CTA阳性率为92%25。