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SPECT对缺血组织显像有独特优势,1.一过性脑缺血发作(TIA).SPECT判断TIA的敏感性高度取决于时间.如在住院当天检查,60%TIA病人会有局部脑血流(rCBF)异常,头一周内阳性扫描率稳定下降.TIA后,rCBF持续减少30%以上的病人,在头几周有发生脑梗塞的危险;2.脑梗塞.可分三期:急性期,梗塞8小时内CT仅20%阳性,而SPECT几乎90%会显示一个低灌注区,MRI发现含水状态和体积变化也要延迟几小时.亚急性期(3～50天),72小时后CT和SPECT的敏感性几乎相等,SPECT可见梗塞区域有一中心区和周围区.慢性
SPECT has unique advantages for ischemic tissue imaging: 1. Transient ischemic attack (TIA). The sensitivity of SPECT in determining TIA is highly dependent on time, as in the day of hospitalization, 60% of TIA patients have localized cerebral blood (RCBF) abnormalities, positive scan rate decreased steadily within the first week.After TIA, rCBF continued to reduce the incidence of cerebral infarction in patients with persistent reduction of more than 30%; 2. Cerebral infarction can be divided into three phases: acute phase , CT was only 20% positive within 8 hours of infarction, and almost 90% of SPECT showed a low perfusion area, MRI also found water-containing state and volume changes should be delayed for several hours. Subacute period (3 to 50 days), 72 hours after CT And SPECT almost the same sensitivity, SPECT visible infarct area has a central area and the surrounding area.