64层螺旋CT低剂量对比剂主动脉成像的可行性研究

Clinical evaluation of aorta angiography under MSCT by using low dose contrast media

目的探讨64层螺旋CT主动脉血管成像中使用低剂量对比剂的可行性。方法 60例主动脉血管成像患者,随机分为A、B、C三组:A组对比剂量80ml+生理盐水20ml冲洗;B组对比剂量70ml+生理盐水30ml冲洗;C组对比剂量60ml+生理盐水40ml冲洗。注射速率均为5ml/s,扫描延迟时间采用自动触发技术。原始数据均传至工作站,进行图像重组,并测量升主动脉、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一名共同阅片,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、C三组血管强化程度、主要分支血管显示清晰度均无统计学差异。结论在64层螺旋CT主动脉血管成像中,应用低剂量对比剂60ml+生理盐水40ml冲洗,图像质量满意,可以满足临床诊断要求。

Objective To evaluate the feasibility of low-dose contrast media in aorta angiography by using spiral comput-er tomography .Methods 60 consecutive patients undergoing aorta angiography were allocated into three groups （group A ：contrast media 80 ml plus saline 20 ml;group B：contrast media 70 ml plus saline 30 ml;Group C ：contrast media 60 ml plus saline 40 ml randomly） .Injection speed was fixed at 5 ml/s .Auto trigger scanning delay time was applied .Image reconstruction was processed when original data were 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 .Results No significant differences were noted among three groups （ P value〉0 .05） in terms of CT values and subjective scoring .Conclusion Substantial reductions of contrast media dose are achievable at multi-detector angiography of the aorta without compromi-sing image quality and diagnostic performance .