MDCT의 다양한 알고리즘과 관상동맥내 삽입된 스텐트 내경측정의 영향

Various Algorithms of MDCT and Effect on Measuring Inside Diameter of Stent within Coronary Artery

Purpose To analyze diameter of stem within phantom and coronary artery and to recognize various algorithm effects that make blooming artifact commonly. Materials and Methods Phantom model was manufactured as follows: stem located in center of thin plastic pipe was situated in glass bottle and mixed saline and contrast (10:1) was filled in bottle. Total 80 patients (man : woman = 53 : 27, mean age = 60.8 years old) who undergo percutaneous coronary intervention (stenting) were included in this study. Coronary CT angiography was performed with the use of a 16- slice MDCT scanner with a 0.42-s rotation time (Sensation 16, Siemens, Erlangen, Germany) and a 64-slice MDCT scanner with a 0.42-s rotation time (Brilliance 64, Philips Medical Systems, Best, The Netherlands) with retrospective ECG gating.A standard scanning protocols were applied. Six radiological technicians measured internal diameter of stem within phantom and coronary artery respectively. As much as possible, we exclude artifacts including blooming artifact. For evaluation of images, window width and window center were used as 900 ± 100 and 400 ± 100 each. Results In phantom model, average inside diameter measured by each algorithms appeared most greatly as 2.35 mm (B50f in S company) and 2.53 mm (XCB in P company) respectively. In patients, in stent resolution processed by XCC was scored as 7.67 (highest) and others (XCA, XCB, XCD) got similar scores. Conclusion B40f (S company, 16 slice MDCT) and XCC (P company, 64 slice MDCT) are appropriate algorithms for evaluating internal patency of stent within coronary artery.