MRI和螺旋CT对主动脉夹层的对比研究及其临床应用

目的对比分析磁共振成像(MR I)和螺旋CT诊断主动脉夹层(AD)的影像特征,评价2种技术对临床的应用价值。方法回顾性分析经手术或临床证实的18例AD的MR I和螺旋CT表现。结果2种先进检查技术诊断AD的敏感性和特异性均较高,能不同程度地显示AD的范围及其分型、真假腔、内膜片和内膜破口、附壁血栓和壁内血肿、主动脉的扩张和狭窄及其分支血管受累情况。结论对疑有AD者应行MR I或螺旋CT检查,MR I与CT对病变范围及分型、真假腔及主动脉的狭窄和扩张的显示相似;而内膜片、内膜破口、附壁血栓和壁内血肿、主动脉整体及分支受累的显示MR I明显优于螺旋CT;对内膜及主动脉壁钙化、急危重者的检查螺旋CT优于MR I。

Clinical Application and Comparative Study of Aortic Dissection with MRI and Spiral CT

Objective To compare imaging features and to evaluate clinical values of aortic dissection(AD) with MRI and spiral CT.Methods MRI and spiral CT findings of AD in 18 cases confirmed by clinical or surgical pathology were analysed retrospectively.Results The sensitivity and specificity of two advanced techniques in diagnosis of AD were high.MRI and CT showed the dimension,true or false lumen,intimal flap,intimal tear,thrombus and intramural hematoma of AD,aortic dilatation or stenosis and the major aortic branches.Conclusion The two techniques are important for the suspect AD,two techniques are similar to display the features of dimension,classification,true or false lumen and aortic dilatation or stenosis,MRI plays an important role in diagnosis of AD and is better than CT in demonstrating the intimal flap,intimal tear,thrombus,intramural hematoma and the involvement of the major aortic branches,there were limitation in demonstrating calcification of intimal flap or vascular wall and emergency patients.