摘要
目的 确定合理的多层螺旋CT(MSCT)胰腺检查多期增强扫描延迟时间。方法 随机选择 6 1例无胰腺疾病患者 ,分为 2个步骤研究 :(1) 2 1例行胰腺同层动态增强扫描 ,对比剂总量为12 0ml,注射流率为 5ml/s,分别测定胰周主动脉、胰周门静脉、胰腺实质及肝脏实质在增强后不同时间点的CT值 ,确立最佳的多期 (动脉期、胰腺期及肝脏期 )增强扫描延迟时间。 (2 ) 4 0例行MSCT胰腺移床式、多期动态增强扫描 ,对比剂总量和注射流率同上 ,分别评价动脉期与胰腺期胰周血管的显示率及显示程度。结果 (1)同层动态扫描结果提示 ,胰周主动脉强化到达峰值平均时间为 30s(延迟时间 2 0s时胰周主动脉CT值已达 2 0 0HU左右 ) ,胰腺实质强化到达峰值平均时间为 4 0s ,胰周门静脉强化到达峰值平均时间为 4 5s ,肝脏实质强化到达峰值平均时间为 6 0s(6 0～ 80s,基本处于一平台期 ) ;(2 )胰周大动脉于动脉期显示率为 10 0 % ,显示程度平均评分为 2 93～ 2 95 ,胰周其他主要动脉期显示率为 78%～ 98% ,显示程度平均评分为 0 85～ 2 6 3;胰周大静脉于胰腺期显示率为 10 0 % ,显示程度平均评分为 2 80～ 2 88,胰周其他主要静脉胰腺期显示率为 90 %～ 10 0 % ,显示程度平均评分为 1 0 8～ 1 90。结论 MSCT行胰腺检查 ,须进行?
Objective To ascertain the optimal multi-phase scan enhanced delay time of MSCT in pancreas examination.Methods Sixty-one patients without pancreatic disease were choosed at randomly in the two approaches study: Firstly,21 patients underwent single-level enhanced serial CT scanning of the pancreas.By means of injection dosage of 120 ml contrast at 5 ml/s rate,CT value of the peripancreatic aorta and portal vein,pancreatic and hepatic parenchyma was measured respectively in order to determine the optimal delay time of multi-phase scanning (including arterial phase,pancreatic phase,and liver phase).Secondly,incremental pancreatic multi-phase MSCT were performed in 40 patients with the same dosage of contrast and injection rate.The display rate and degree (categorized on a scale of 0-3) of peripancreatic blood vessels at arterial phase and pancreatic phase was evaluated emphatically.Results (1) The results of single-level enhanced serial CT scanning indicated that the average time was 30 s for peak enhancement of the peripancreatic aorta (the CT value of the peripancreatic aorta mostly exceeded 200 HU at 20 s),40 s for the pancreatic parenchyma,45 s for the peripancreatic portal vein,and 60 s for the hepatic parenchyma (the platform stage for the hepatic parenchyma ranged from 60 s to 80 s).(2) The results of step two showed that the display rate and the average score of display degree was 100% and 2.93-2.95 for the big peripancreatic arteries at the arterial phase,78%-98% and 0.85-2.63 for the other main peripancreatic arteries at the arterial phase; 100% and 2.80-2.88 for the big peripancreatic veins at the pancreatic phase,90%-100% and 1.08-1.90 for the other main peripancreatic veins at the pancreatic phase.Conclusion The optimal protocol of MSCT was the triple-phased enhancement scan for pancreas,and the recommended delay time was 20 s for arterial phase,45 s for pancreatic phase,and 80 s for liver phase,respectively.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2004年第3期287-290,共4页
Chinese Journal of Radiology
