目的 研究CT扫描及其后处理技 术对主动脉夹层瘤(AD)的诊断价值。方 法 以本院2013年3月-2015年12月收治 的45例AD患者为研究对象，均行多层螺 旋CT(MSCT)检查，同时利用多平面重组 (MPR)、容积再现(VR)等不同图像后处理 技术三维重建。观察记录AD分型、真假 腔、内膜初始破口大小、数目等情况，并 比较不同图像后处理技术对AD破口检出 率。结果 Debakey分型：I型8例，II型 5例，III型32例。45例AD患者中真腔密 度明显大于假腔密度占92.9%；假腔直径 明显大于真腔占94.6%；破口清晰显示占 87.5%。MPR破口显示率92.8%，真假腔显 示率96.4%，内膜瓣显示率100.0%；CPR破 口显示率96.4%，真假腔显示率98.2%，内 膜瓣显示率100.0%；MIP不显示AD破口及 内膜瓣，真假腔显示率76.8%；VR破口、 真假腔、内膜瓣显示率分别为23.2%、 100.0%、98.2%。MPR、CPR破口显示率明 显高于VR(P＜0.05)，且真假腔显示率明 显高于MIP(P＜0.05)。结论 MSCT在AD诊 断上有较大的价值，且MPR、CPR相比其他 后处理技术在AD破口、真假腔、内膜瓣显 示上更有优势。

Objective To study the diagnostic value of CT scan and its postprocessing techniques in aortic dissection aneurysm (AD). Methods 56 cases of AD patients who were admitted in our hospital between March 2013 and December 2015 were selected as the study objects. All of them underwent multi-slice spiral CT (MSCT) examination. Meanwhile, multiple planar reconstruction (MPR), volume rendering (VR) and other different image postprocessing techniques were used for three-dimensional reconstruction. AD type, true and false lumens, size and number of intimal initial rupture were observed and recorded. The detection rates of different image postprocessing techniques in AD rupture were compared. Results Debakey typing: there were type I 12 cases, type II 7 cases and type III 37 cases. In 56 patients with AD, the density of true lumen significantly larger than that of the false one accounted for 92.9%; Diameter of false lumen significantly larger than that of the true lumen accounted for 94.6%; Clear display of rupture accounted for 87.5%. The display rates of MPR for rupture, true and false lumens and intimal flap were 92.8%, 96.4% and 100.0% respectively; The display rates of CPR for rupture, true and false lumens and intimal flap were 96.4%, 98.2% and 100.0% respectively; MIP did not display AD rupture and intimal flap while the display rate for true and false lumens was 76.8%. The display rates of VR for rupture, true and false lumens and intimal flap were 23.2%, 100.0% and 98.2% respectively. The display rates of MPR and CPR were significantly higher than that of VR (P<0.05), and the display rates for true and false lumens were significantly higher than that of MIP (P<0.05). Conclusion MSCT is of great value in diagnosis of AD. Besides, MPR and CPR have more advantages in displaying AD rupture, true and false lumens and intimal flap, compared with other image postprocessing techniques.