The diagnosis of cerebral arteriosclerosis、cerebral arteries insufficiency、cerebral angiostenosis、cerebrovascular occlusion、cerebral vasospasm、intracal arteriovenous malformations and infraclavicula blood-robber syndrome;the research of intracranial hypertension、subarachnoid intracerebral hemorrhage、migraine、cerebral ischemic diseases; cerebral thrombus detection and tracking etc.