多层螺旋CT血管成像在颅内动脉瘤诊断中的价值

目的通过与三维数字血管减影（DSA）对比,评价64层螺旋CT血管成像（CTA）对颅内动脉瘤尤其是〈3 mm动脉瘤的诊断价值。方法选择怀疑有颅内动脉瘤的310例患者纳入研究,所有患者均行64层螺旋CTA和DSA检查。64层螺旋CTA技术参数：120 kV、250 mAs、准直0.75 mm、重建层厚0.75 mm和间隔0.4 mm。结果三维DSA作为诊断标准,在310例患者中,220例发现264个动脉瘤。CTA漏诊4个动脉瘤,7个动脉瘤在常规DSA检查中漏诊,但被64层螺旋CTA诊断,均得到三维DSA的证实。64层螺旋CTA诊断〈3 mm颅内动脉瘤的敏感性、特异性和准确性分别是94.0%、100.0%和97.9%。结论 64层螺旋CTA对于颅内动脉瘤包括〈3 mm动脉瘤是一种准确的影像学检查方法,可以作为颅内动脉瘤诊断的首选影像检查。

Value of multislice CT angiography in diagnosis of intracranial aneurysms

Objective To assess the diagnostic value of 64-row multislice CT angiography（CTA） for intracranial a neurysms,especially small aneurysms（ 3 mm） by comparing with three-dimensional digital subtraction angiography（DSA）.Methods A total of 310 patients suspected intracranial aneurysm were included in this study and successively un derwent 64-slice CTA and DSA examination.The 64-slice CTA data acquisition and reconstruction parameters were per formed according to the following protocol：120 kV,250 mAs,collimation 0.75 mm,postprocessing reconstruction 0.75 mm and interval 0.4 mm.Results Three-dimensional DSA was considered as the gold standard,and among 310 cases of pa tients,264 aneurysms were detected from 220 patients.4 aneurysms were missed when by CTA detection.7 aneurysms were not clearly displayed at conventional DSA,but diagnosed by 64-slice CTA,and all missed aneurysms were proved by three-dimensional DSA.The sensitivity,specificity,and accuracy of 64-slice CTA in detecting less than 3 mm aneurysms were 94.0%,100.0% and 97.9% respectively.Conclusion 64-slice CTA is an accurate imaging examination for intracranial aneurysms detection including less than 3 mm aneurysms.It can be used as a preferred imaging examination for in tracranial aneurysm diagnosis.