256层CT对急性主动脉夹层内膜片的动态分析.pdfVIP

Abstract Abstract Objectives: To evaluate retrospective ECG-gated thoracoabdominal aorta CT angiography(CTA) assessing abdominal aortic intimal flap motion and investigate the motion characteristics of intimal flap in acute aorticdissection (AAD). Materials and Methods: 15 patients who had thoracoabdominal aorta retrospective ECG-gated CTA scan were enrolled. 10 datasets were reconstructed in 10% steps between 0 and 90% of the R-R interval in each case. The aortic intimal flap motion was assessed by measuring the short axis diameters of the true lumen and false lumen 2 cm above of celiac trunk ostium in different R-R intervals. Intimal flap motion and configuration was assessed by two independent observers. Results: 150 datasets of 15 patients who showed double lumens in abdominal aorta were enrolled in evaluating intimal flap motion.The maximum and minimum true lumen diameter were 10.3±4.1 mm and 6.5±3.9 mm respectively. The range of intimal flap motion in all patients was 3.8±2.7 mm. The maximum motion phase of true lumen diameter was in systolic phase. Maximum and minimum intimal flap motion was at 10% and 70% of the R-R interval respectively. Intimal flap configuration had correlation with the phase of cardiac cycle. Conclusions: Retrospective ECGgated thoracoabdominal aorta CTA can reflect the actual status of the true lumen and provide more information about true lumen collapse. Abdominal intimal flap position and configuration varied greatly during a cardiac cycle. This information may be helpful to diagnosis and differential diagnosis of dynamic abstraction. Key words:256-slice CT；Retrospective ； ECG-gated ；Acute aortic dissection ； CTA ；Int