MSCTA 在主动脉夹层成像中的应用

目的：探讨多层螺旋CT血管造影（ MSCTA ）在主动脉夹层成像中的应用价值。评价三维重建图像对主动脉夹层的破口、内膜瓣和真、假腔的显示能力。方法49例主动脉病变的患者作为研究对象，对所有患者行CT增强扫描。重建方法为容积再现（VR）、最大密度投影法（MIP ）、多平面重建法（MPR）、曲面重建（CPR），分别计算各种重建方法对破口、内膜瓣和真、假腔的显示率。结果 MPR，CPR，VR对破口的显示率分别为95．92％，95．92％，18.37％，对内膜瓣的显示率均为100％。 MIP不能直接显示破口和内膜瓣。 MPR，CPR，VR对真、假腔的显示率均为100％， MIP为67．35％。 MSCTA同时可以发现主动脉之外的疾病。结论 MSCTA适用于主动脉夹层的显示，所采集的数据能够满足3D图像后处理的需要。 MPR和CPR对主动脉夹层显示最好，VR次之，MIP最差。

Application of MSCTA in aortic dissection imaging

Objective To investigate the application of aortic angiography with multi-slices CT angiography （ MSCTA） on aortic dissection （AD） and to determine the value of the three-dimensional（3D） reconstruction imaging in detecting tears , the extent of intimal flap , and the true and false channel of dissection .Methods 49 patients with aortic diseases were evaluated with multi-slices CT scanner.3D reconstruction techniques including volume rendering （VR）,maximum intensity projection （MIP）,multi-plane reformation （MPR）,curved planar reformation （CPR） were adopted.The demonstration rate of each re-construction on tears , the extent of intimal flap , and the true and false channel of dissection was calculated .Results The demonstration rate of MPR,CPR,and VR on tears was 95.92%,95.92%,and 18.37%,respectively.And the rate for intimal flap was 100%.MIP didn＆#39;t demonstrate the tear and intimal flap .The demonstration rate of MPR ,CPR,and VR on the true and false channel was 100%respectively,and MIP was 67.35%.MSCTA could also demonstrate diseases beyond the aorta in im-age simultaneously.Conclusion MSCTA can well display the aortic dissection and the raw data is suitable for 3D post-pro-cessing.MPR and CPR are superior to VR and MIP .