Cardiac CTA의 조영제 주입시간에 관한 연구

The study About Injection Time of The Contrast Media at Cardiac CT Angigraphy

Purpose This study was to survey contrast media washout time in right atrium(RA) using time bolus and saline push method. And, we have compared routine injection with changed injection method in order to obtain the excellent images without streak artifacts at cardiac computed tomographic angiography(CTA). Materials and methods We have inspected 50 people those who had scanned CT during November, 2008. After preparing intravenous route in medial-cubital vein at elbow joint of right side, we had performed the test bolus at the ascending aorta. We attained enhance peak time and injected the combination of contrast media(CM) and saline(CM: 60cc, 4cc/sec ; saline: 50cc, 5cc/sec). Then we acquired contrast media washout time in RA to below 300HU. We have selected 45 people those who had scanned cardiac CTA between October to November 2005. We divided them to 3 groups(group A: CM 70cc, 4.0/sec ; saline 30cc, 4.0/sec, group B: CM 75cc, 4.0/sec ; saline 30cc, 4.0/sec, group C: CM 80cc, 4.0/sec ; saline 30cc, 4.0/sec) and evaluated in the quantitative and qualitative way. We have performed 50 people those who had scanned cardiac CTA using changed volume method(group D) and evaluated in and qualitative way during January, 2009. Results 1. At the time curve coordinates against HU of RA, contrast media washout time takes 23sec in 15 and takes 24sec in 35 people to below 300HU. It means that takes about 9sec after injection contrast media. 2. Group D is superior to other groups(A, B, C) in the quantitative way. 3. Group D is superior to other groups(A, B, C) in the qualitative way. Conclusion According to the results contrast media washout time has regularity and changed volume method helped to obtain excellent image without streak artifacts.