目的 探讨多层螺旋CT血管成像 (MSCTA)对颈动脉夹层(CAD)的诊断价值。 方法 回顾性分析29例经DSA证实的CAD患 者的两种影像学资料。结果 以DSA为“金 标准”，MSCTA诊断颈动脉夹层的敏感度 为96.8%，特异度为98.8%，阳性预测值 为93.7%，阴性预测值为99.4%，符合率为 98.5%。MSCTA以“双腔征”最多见，12例 (占42.9%)，DSA以线样征多见，15例(占 52%)，结论 MSCTA对颈动脉夹层的诊断具 有较高的敏感性和特异性，可以作为评价 颈动脉夹层的首选无创性检查手段。

Objective To investigate the diagnostic value of multi-slice spiral CT angiography for carotid artery dissection. Methods Twenty-nine patients with carotid artery dissection confirmed by DSA were analyzed on imagine features of multi-slice spiral CTangiography and DSA. Results Compared with digital subtraction angiography, the sensitivity of multi-slicespiralCTangiography for carotid artery dissection was 96.8%, the specificity was 98.8%, the positive predictive value was 93.7%, the negative predictive value was 99.4%, and the accuracy was 98.5%. CTA showed the double lumen sign(n=12, 42.9%). The DSA showed the line like sign(n=15, 52%). Conclusion The results suggest that multi-slice spiral CT angiography has high sensitivity and specificity. It can be an important non-invasive diagnositic method for evaluating carotid artery dissection.