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《Chinese Journal of Medical Imaging Technology》 2010-08
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Choice of triggering position and post-processing technique in multi-slice CT pulmonary angiography

ZHOU Yun-feng,SHI He-shui,WU Ai-lan,LI Xin,GU Jin,LIU Yong-hua,HAN Ping* (Department of Radiology,Union Hospital of Tongji Medical College of Huazhong University of Science & Technology,Wuhan 430022,China)  
Objective To evaluate the clinical application of triggering position located at superior vena cava and to choose the different post-processing techniques in CT pulmonary angiography(CTPA).Methods Forty patients with suspected pulmonary embolism(PE) were divided into group A and B.For group A,the region of interest(ROI) of triggering position located at pulmonary artery trunk,the threshold was 80 HU and the dose of contrast medium was 50-60 ml.For group B,the ROI located at superior vena cava,the dose of contrast medium was 35-45 ml and other parameters were as same as group A.CTPA images of the two methods were analyzed.Densities of pulmonary artery trunk and right lower pulmonary vein were measured,the ratios of the displayed 6th grade pulmonary artery was calculated and the results were statistically analyzed.The ratios of different post-processing techniques in displaying embolism were compared.Results All CTPA images were satisfactory except one patient with severe right ventricular dysfunction in group B.The densities of pulmonary artery trunk and the displaying ratios of the 6 th grade pulmonary artery showed no significant difference between the two methods,but significant difference existed in the densities of right lower pulmonary vein(P=0.04).Different post-processing techniques had their own advantages in displaying different kinds of embolism.Conclusion CTPA examination with triggering position located at superior vena cava can decrease the dose of contrast medium and improve the quality of images.Combination of different post-processing techniques can display the embolism better and improve the accuracy of diagnosis.
【CateGory Index】: R563.5
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