The Technique of SCTA Image in Aortic Dissection / 实用放射学杂志

ABSTRACT

Objective To study the scan parameter of spiral CT angiography in aortic dissection.Methods 34 cases with aortic dissection successively underwent SCTA were studied retrospectively.The CT scan parameters,methods of posteriorimage treating were reviewed and analysed one by one.Results In 34 cases,32 cases were diagnosed as aortic dissection and classified correctly,in accordance with the result of operation and DSA,the quality of image was satisfied and the rate of success at least above 88.9%.The use of main scan parameters(1)the ascend aortic dissectionslice thickness 4 mm,reconstruction interval 2 mm,pitch 1.25;tube current 175 mA;(2)involed in ascend,arch,descend and throacic aorta dissectionslice thickness 5 mm,reconstruction interval 2～3 mm,pitch 1.5;tube current 150 mA;(3)involved in abdominal aortic dissectionslice thickness 6～8 mm,reconstruction interval 2～3 mm,pitch 1.5 or 1.75;tube current 125 mA.The tube voltage all were 120 kV,the dosage of contrast media was 90～100 ml;the delayed scan time was choiced 20 second in throacic aortic and 25 second in abdominal aortic.The posterior image methods main used MPR,SSD,MIP and VR. Conclusion To set a sensible scaning plan,choose and match scan parameters properly according to the scaning length,can avoid the shortage of restrain SCTA scaning length and get satisfied image.