Study Of The Application About Dual-source CT Aortic Angiography

Objective To investigate the applicationo of Dual source CT with Bolustracking onaortic disssection. To determine the value of MPR,CPR,VR,SSD,MIP in detecting of tear entry, the extent of intimal flap,and the ture and aflse channel of dissection. Materials and Methdos Fouty-eight patient with supsected aortic diseases were evaluated in this study with Siemens Dual source CT sennaer.All ofthe scans were perfomed witht the bolus tracking of 88ml noninoic contarst material followed by flushing40~50ml of physiologic saline solution at 4ml/sec. Average value of aorta enhancement and its standard deviation over baseline were calculated of both group,with dissection and non-dissection. The imaging quality in both groups were graded as excellent, good, poor and failure and were compared respectively MPR,CPR,VR,SSD,MIP were reconstructed from raw data in allpatients. The demonstration rate of each reconsturction on tear entry, the extent of intimal flap,and the true and false channel of disscetion was calculated, as well as the sensitivity,specificity ,and accuracy of each reconstruction for enrty tear Results The mean value of aorta enhancement of non-dissection group was not signficantly dieffrent from that in true channel of dissection group (P>0.05), but significantly different from that in false channel of dissection group (P=0.01). In dissection group the mean value of aorta enhancement in true channel differed significantl from that of false channel (P=0.01). The imaging quality of both groups was not significant dieffrent (P>0.05). The demonstration rate of MPR, VR, CPR, and SSD on tear entry was 82.1%,21.4%,85.7% and 10.7%, respectively.And for intimal flap was 100% respectively MIP didn't demonstrate the tear entry and intimal flap.The demonstration rate of MPR, VR, CPR, nad SSD on the true and false channel was 100% respectviely,and MIP was 75%. Conculusion Dual source CT angiography with bolus tracking can well display the aortic dissection and the row data was suitable for 3D postprocessing MPR,CPR,VR,SSD,and MIP are useful in evaluating aortic dissection MPR and CPR are superior to MIP.