不同剂量碘对比剂主动脉成像效果的临床评估

目的:探讨64层MSCT主动脉血管成像中使用较低剂量对比剂的可行性。方法:主动脉血管成像患者60例,随机分为A、B、C 3组。A组为对比剂70mL+生理盐水30mL;B组为对比剂60mL+生理盐水40mL;C组为对比剂50mL+生理盐水50mL。注射速率均为5mL/s,扫描延迟时间采用自动触发技术。原始数据传至工作站后进行图像重组,测量升主动脉、T7及L2水平降主动脉、主动脉分叉处CT值。由主治医师及副主任医师各1名独立阅片,对血管强化程度、主要分支血管显示清晰度进行评价。结果:A、B 2组4个解剖部位CT值及主要分支血管显示清晰度差异无统计学意义(P0.05),C组与A、B组差异有统计学意义(P0.05)。结论:在64层MSCT主动脉血管成像中,应用低剂量对比剂(对比剂60mL+生理盐水40mL),图像质量可满足诊断要求。

Clinical evaluation of aorta angiography using iodine contrast media of different dose

Objective：to evaluate the feasibility of low-dose contrast media in aorta angiography by using spiral computer tomo-graphy .Methods ：60 consecutive patients undergoing aorta angiography were allocated into three groups （group A ：contrast media 70mL plus saline 30mL ;group B：contrast media 60mL plus saline 40mL ;group C ：contrast media 50mL plus saline 50mL randomly .Injection speed was fixed at 5mL/s .Auto trigger scanning delay time was applied .Image reconstruction was processed when original data was transferred to workstation .The CT values in different anatomic sites such as ascending aorta ,descending aorta and aorta crotch were collected .Strengthen effect presented by scoring of main branch resolution was evaluated by both an attending doctor and a chief attending doctor independently .Results：No significant differences were noted between group A and group B（P〉0 .05） ,however ,group C showed lower imaging quality in terms of CT values and subjective scoring compared with other two groups（P〈0 .05） .Conclusion：Substantial reductions of iodine contrast media dose are achievable at multi-detector angiography of the aorta without compromising image quality and diagnostic performance .