【摘要】 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。更多还原

【Abstract】 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 reconstruction 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’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 image simultaneously. Conclusion MSCTA can well display the aortic dissection and the raw data is suitable for 3D post-processing. MPR and CPR are superior to VR and MIP.更多还原