双源CT峰值跟踪法颈部CTA扫描优化方案初步探讨

Research of DSCT Neck CTA Optimizing Program

目的:初步探讨64层双源CT颈部动脉成像优化方案。方法:将60例行颈部CTA检查的患者随机分为A、B两组,每组30例。所有患者对比剂注射速率均为4.0mL/s,使用自动触发技术,阈值设为120Hu,达到峰值后延迟4s扫描,A采用足向头方向的扫描方案,B组采用头向足方向的优化方案,其他参数相同,扫描后数据传至工作站做后处理,然后对图像进行评价。结果:B组注射侧头臂静脉CT值比A组低,差异具有统计学意义(P<0.01);B组主动脉弓CT值高、大脑中动脉CT值低,但与A组比较差异无统计学意义(P>0.05)。结论:双源64层螺旋CT颈部动脉成像优化方案,能有效消除注射侧头臂静脉伪影干扰,改善颈部动脉显示效果。

Objective： To explore optimal program of dual-source CT in cervical vessel. Methods： 60 Neck CTA cases were randomly divided into two groups （A and B, each group contains 30 cases）. The injection rate of contrast is 4.0 mL/s. With the help of automatic trigger technic taking triggered threshold as 120 Hu scanning began4 seconds after the CT value arriving at the peak 75 Hu peak While scanning direction was from caudal to cranial in A group, and cranial to caudal in group B, which is the optimal program. The other parameters were constant. All data was sent to the workstation and evaluated by SIEMENS software. Results： The CT value of brachiocephalic veininjected between group A and B had statistical significance （p 〈 0.01）. Although the CT value of aortic artery in group B was a bit higher than that in group A, and the CT value of middle cerebral artery in group B was a bit lower than that in group A, those had no statistical significance. Conclusion： The optimal program of dual-source CT in cervical vessel can effectively demolish the disturbance of brachiocephalic vein injected and improve the image quality of cervical artery.