双源CT颈动脉成像扫描参数的优化研究  

Optimization of scanning parameters in dual-source computer tomography angiography on carotid

作　　者：顾海峰[1] 陈鹏[1] 张龙江[1] 李林[1] 周长圣[1] 郑玲[1] 

机构地区：[1]南京军区南京总医院医学影像科,江苏南京210002

出　　处：《医学研究生学报》2009年第8期833-836,共4页Journal of Medical Postgraduates

基　　金：南京军区南京总医院青年课题基金资助项目(批准号:Q2008062)

摘　　要：目的:常规双源CT颈动脉成像时锁骨下静脉内残留的造影剂伪影常会对颈动脉的显示造成干扰,不利于病变的显示和诊断。文中探讨常规双源CT颈动脉成像时锁骨下静脉内残留的造影剂对影像的干扰并对常规扫描参数进行优化,找出最佳解决方法。方法:100例患者随机分为2组,常规成像组52例用常规成像方法:65 ml对比剂、流速4.0 ml/s、足向头方向扫描。头向足扫描组48例保持其他参数不变,仅把扫描方向改为由头向足方向。根据原始轴位图像、最大强度投影(MIP)、减影图像及VR重建影像评价2组病例锁骨下静脉是否有残留造影剂干扰及相同层面颈动脉的显示情况。结果:头向足扫描组病例颈动脉均能清晰显示,常规成像组中尤其是锁骨下静脉层面显示欠佳。显示程度评分2组间存在明显差异(P<0.05)。结论:双源CT颈动脉成像在其他参数不变的情况下采用头向足的扫描方式能消除锁骨下静脉内残留的造影剂对影像的干扰,并能提高诊断的精确度。Objective：Rudimental contrast media in the subclavian vein often influence the display of carotid on dual-source computer tomography angiography. This article aimed to investigate this influence, and find a best solution. Methods：One hundred patients were randomly divided into Groups A （n = 52） and B （ n = 48 ）. The former received traditional imaging, with 65 ml contrast media, 4.0 ml/s injection flow and caudocranial scanning direction, while the latter kept all the parameters unchanged except the scanning direction, from caudocranial to craniocaudal. Each group was graded by original axial images, maximum intensity projection （MIP） , silhouette images and VR images for vascular delineation of the carotid. Results ： The carotid artery was clearly displayed in Group B, while the subclavian vein was unsatisfactorily revealed in Group A, with statistically significant differences in extent scores between the two groups （P 〈 0. 05 ）. Conclusion： In dual-source computer tomography angiography on the carotid, the mode of craniocaudal scan can reduce the influence of the rudimental contrast media in the subclavian vein and improve the accuracy of diagnosis.

关 键 词：双源CT 多排螺旋CT血管显像 颈动脉成像 扫描参数优化 

分 类 号：R814.42[医药卫生—影像医学与核医学]