이중시기 다중검출기 전산화단층촬영에서 췌장의 감쇠치 변이: 조영제추적기법과 고정시간기법의 비교

Abstract

Purpose: To clarify the difference between the bolus-tracking technique and a fixed scan delay protocol in the achievement of the optimal pancreatic phase of the pancreas with MDCT. Materials and Methods: 526 patients underwent pancreatic and portal venous phase imaging of the pancreas using 16-channel MDCT. All the examinations were randomized into either scanning using a bolus-tracking technique with a scan delay of 20s after the aorta was enhanced > 100 HU (groups 1 and 2) or scanning with a scan delay of 38 s from the beginning of the injection (groups 3 and 4). A contrast material of 300 mgI/mL (groups 1 and 3) or 370 mgI/mL (groups 2 and 4) at an injection speed of 3 mL/sec was injected at 2 mL/kg body weight. The pancreatic CT attenuation values were compared. Results: The scan delay times of the pancreatic phase in groups 1 and 2 were 38±3.8s and 37.4±3.4s, respec tively. At the pancreatic phase, the pancreatic attenuation values of groups 1 and 2 were slightly higher than those of groups 3 and 4 (115.5±15.4 vs 111.7±15.1HU; p=0.093, 128.3±17.1 vs 119±17.1HU; p=0.003). There was no significant difference between groups at the portal venous phase. Conclusion: The use of a bolus-tracking technique in the optimal pancreatic phase of pancreatic CT does not significantly improve the pancreatic enhancement but does at higher iodine concentrations