电子束CT血管造影及三维重建在主动脉病变诊断中的临床应用

目的建立电子束ＣＴ血管造影（ＥＢＣＴ－Ａｎｇｉｏｇｒａｐｈｙ）常规扫描及三维重建方法，探讨其临床应用价值。材料与方法回顾分析了自１９９５年７月至１９９６年１２月经ＥＢＣＴ诊断的各种主动脉病变共１８９例，男１５２例，女３７例，其中６８例与手术结果作了对照。胸主动脉扫描采用单层增强扫描方法（ＳＳＭ），心电门控采像；腹主动脉扫描采用连续容积扫描方法（ＣＶＳ），无心电门控。三维重建方法采用表面阴影显示法（ＳＳＤ）、多层面或曲面重建法（ＭＰＲ／ＣＰＲ）及最大密度投影法（ＭＩＰ）。结果１８９例主动脉病变包括各型夹层动脉瘤９７例，真性动脉瘤２６例，假性动脉瘤８例，马凡综合征３９例，大动脉炎５例，各种先天性主动脉发育异常１４例。６８例与手术对照，ＥＢＣＴ诊断符合率为９７％。结论ＥＢＣＴ血管造影图像时间分辨率高，消除了呼吸及运动伪影，可以明确诊断各种主动脉病变；三维重建图像利于整体直观地显示病变，帮助明确诊断并指导手术；在主动脉病变的诊断方面，可望取代有创的常规血管造影。

Clinical application of EBCT angiography and three dimensional reconstruction in the diagnosis of aortic diseases

Purpose To work out the routine and three dimensional reconstruction (3D) methods of electron beam computed tomography angiography(EBCTA) and evaluate its clinical application. Materials and methods In this group,189 cases with aortic diseases(152 male , 37 female) were studied retrospectively. The EBCT scan methods were enhanced single slice mode(SSM)and continuous volume scan(CVS); The 3D reconstruction methods were shaded surface display(SSD),maximum intensity projection(MIP) and multiple/curved planar reconstruction(MPR/CPR). Results In 189 cases, including 97 cases with aortic dissection,26 cases with aortic aneurysm and 8 cases with pseudoaneurysm, others including Marfan's syndrome in 37 cases, Takayasu's arteritis in 5 cases and congenital aortic malformations in 14 cases; 68 cases received operation and the EBCT diagnosis coincided well with the operative findings in 97% of cases. Conclusion EBCT angiographic images have very high temporal resolution and most artifacts are eliminated. The 3D images are in helpful accurate diagnosis and direct surgical operation. In the management of aortic diseases, EBCT angiography and 3D reconstruction may supplant conventional angiography in the near future.