64排CT在头颈CTA中最佳扫描时机探讨  

Evaluation on optimal scan time for 64-slice CT angiography for head and neck

作　　者：钟俊锋[1] 李云霞[1] 钟兰生[1] 

机构地区：[1]惠州市第一人民医院放射科,广东惠州516001

出　　处：《中国医学影像技术》2012年第3期579-581,共3页Chinese Journal of Medical Imaging Technology

摘　　要：目的探讨64排容积CT头颈联合动脉成像最佳对比剂浓度的扫描时机。方法回顾性分析103例头颈动脉联合成像的扫描延迟时间与靶血管中对比剂浓度之间的相互关系,重新设计扫描延迟时间公式,按新公式扫描测量52例头颈CTA靶血管中对比剂浓度。结果使用新设计的延迟时间公式扫描,测得颈总动脉和大脑中动脉对比剂浓度CT平均值为(370±51)HU,而原公式对比剂浓度CT平均值为(440±79)HU,明显高于新公式(u=6.5565,P<0.01)。结论使用新公式计算扫描延迟时间,可将头颈CTA中靶血管对比剂浓度稳定地控制在显示血管软斑块的浓度值上,避免对比剂浓度过高、静脉过度显影等造成静脉伪影。Objective To evaluate 64-slice volumetric CT imaging of head and neck arteries for optimal contrast agent concentration scan time.Methods The relationship between delay time and contrast concentration of the target vessel in 103 cases with head and neck arteries combined imaging were retrospectively analyzed,and the design scan delay time formula was re-started.Under the new formula for scanning,52 cases of head and neck CTA contrast agent concentration in the target vessel were measured.Results Using the new formula for delay time of scanning,the average CT contrast agent concentration of common carotid artery and middle cerebral artery was（370±51）HU,while the mean CT contrast agent concentration was（440±79）HU using original formula（u=6.5565,P0.01）.Conclusion Using the new formula to calculate scan delay time for head and neck CTA can stably control CT contrast agent concentration in the target vessel which is easy to show soft plaques,and avoid excessive concentration of contrast agent,intravenous excessive imaging and other effects.

关 键 词：体层摄影术 X线计算机 血管造影术 头部 颈 对比剂 

分 类 号：R814.42[医药卫生—影像医学与核医学]