摘要
目的:评价MRI对主动脉夹层的诊断价值。方法:回顾性分析7例主动脉夹层的MRI表现。采用SiemensIm pact 1 0TMR成像仪,行轴位、冠状位及平行主动脉弓斜位扫描,SE序列T1WI、T2 WI成像。扫描范围自肺尖至左右髂血管分叉处。结果:按DeBakey分型:Ⅰ型2例,Ⅱ型2例,Ⅲ型3例。按Stanford分型:A型2例,B型5例。MRI表现:直接征象:①主动脉管腔内的内膜片,7例显示内膜片呈线样螺旋状稍高信号;②双腔主动脉,7例显示真腔较假腔小,呈三角形或半圆形,假腔宽大,信号较真腔高;③1例显示内膜破口。间接征象:①主动脉增宽5例;②胸腔积液3例,呈长T1长T2信号,1例腹膜后渗出,表现为肾筋膜增厚;③累及动脉瓣和主要大血管分支,2例主动脉瓣受累,2例累及头臂血管,1例腹腔动脉受累,2例累及肾动脉,2例累及髂血管。受累血管内信号增高,内壁不光整。结论:主动脉夹层具有典型MRI征象。MRI对主动脉夹层的诊断具有较高的敏感性和特异性,是一种无创、安全、有效的检查方法。
Objective:To evaluate the diagnostic vlue of MRI in aortic dissection.Methods:To analyze retrospectively the manifestation of 7 cases with aortic dissection diagnosed and treated in our hospital, 5 cases were males and 2 cases females:they all burst out abdominothoracic ache continually,and were scanned with transitional,sagittal,coronal and oblique position by Seimens impact 1.0T MR scan.And T_1 weighted,T_2 weighted imaging in SE.The range was from lung tip to cross of iliac vessels.Results:7 cases wer classified into Bakey type Ⅰ,Ⅱ,Ⅲ,in 2,2 and 3,they were classified into Stanford type A,B in 5,2.The MR manifestation:the direct signs:①the membrane in aorta:7 cases showed linear and spiral intense-signal;②the aorta showed double lumen,7 cases showed double lumen,the true lumen was smaller than the false, it showed triangle or semicircular shape;③1 cases showed the hole of intimal tear.The indirect signs:①5 cases showed the aorta widened;②3 cases showed pleural effusion;③the major aortic branches and aortic valve were involved:the brachiocephalic vessels of 2 cases,the celio-artery of 1 cases,the renalis of 2 cases,and the iliac vessels of 2 cases were involved.Conclusion:There are typical manifestation of MRI in aortic dissetion.It has a good sensitivity and specificity.It is a non-invasive,safty,effective method in the diagnosis of aortic disseetion.
出处
《医学影像学杂志》
2005年第6期466-468,共3页
Journal of Medical Imaging
关键词
主动脉
夹层
磁共振成像
Aorta
Dissection
Magnetic resonance imaging
