BACKGROUND: The ischemic cerebrovascular disease ofsenile patients has the features of high recurrence rate, bad prognosisand many influence factors. The coming out of CT makes diagnosis ofcerebrovascular disease getting reliable foundation. But the diagnosisof CT can not determine the location of specific blood vessels ofresion, especially the ischemic changes caused by spasm and nar-rowness of blood vessels in early period. In addition, examination ofcerebral angiography can cause trauma, so patients with severecerebrovascular disease can not endure it.