Diagnostic value of multi-slice CT angiography for the posterior circulation ischemia

Objective To investigate the value of multi-slice CT angiography(MSCTA)for the diagnosis of posterior circulation.Methods One hundred and fifty-five cases of posterior circulation ischemia diagnosed by MRA were chosen,and took MSCTA examination in 7 days,15 cases simultaneously took the digital subtraction angiography(DSA) examination.Results Ninety-nine visible stenosis was found in 95 cases,and the stenositic sites were clearly visible.Four of the stenosis was caused by the hyperplasia of cervical vertebra,3 caused by blood vessel variation of vertebral artery;right vertebral artery of 56 cases was significantly thinner than the contralateral,showed obviously left artery(in which 12 patients showed a vertebral artery or basilar artery stenosis of different degrees).Compared with the results of DSA(15 cases),MSCTA diagnosed the stenosis with the sensitivity of 94.73%,specificity of 100%,Kappa value of 93.0%.Conclusion MSCTA has important diagnostic value for posterior circulation ischemia,vertebrobasilar artery stenosis.