颈段脊髓前动脉64排螺旋CT血管成像技术的优化  

Optimization of the scanning technology of 64-detector spiral CT angiography of cervical anterior spinal artery

作　　者：王娇燕[1] 尹化斌[1] 

机构地区：[1]复旦大学附属上海市第五人民医院放射科,上海200240

出　　处：《中国临床神经外科杂志》2015年第5期277-279,283,共4页Chinese Journal of Clinical Neurosurgery

摘　　要：目的探讨64排螺旋CT血管成像显示颈段脊髓前动脉（ASA）最佳预测扫描延迟时间的技术及扫描参数。方法将150例患者采用信封法机分成A、B两组。A组90例,根据CT触发阈值（80、100、120、140、160和180 Hu）又分为A1～A6组,采用对比剂自动跟踪技术;B组60例,根据延迟时间至峰值时间（2.4、6和8 s）又分为B1～B4组,采用小剂量测试技术。分析颈段ASA的显示情况,对A、B组中显示率最高的组别计算实际扫描延迟时间,并测量颈4～5层面椎动脉及ASA的CT值。结果 A组中,CT触发阈值为120 Hu（A3组）时,ASA显示率最高,达73.31%;B组中,延迟时间到峰值时间为4 s（B2组）时,ASA显示率最高,达80.00%。A3和B2组别的实际扫描延迟时间、颈4～5层面椎动脉及ASA的CT值,差异均无统计学意义（P〉0.05）。B组实际扫描延迟时间个体差异明显（16～36 s）,误差达20 s。结论对比剂自动跟踪技术和小剂量测试技术经优化后均能较好的显示颈段ASA,而小剂量测试技术更能充分体现个体化的原则,可作为首选检查方法。Objective To explore the optimal scanning techniques to predict the scan-delay-time after the administration of contrast medium and the best scanning parameters of 64-detector spiral CT angiography showing the cervical anterior spinal artery （ASA）. Methods One hundred and fifty patients were randomly divided into groups A （n=90） and B （n=60） on the base of Bolus-tracking and Test-bolus technology. Ninety patients in the group A were divided again into 6 subgroups （n=15） according the postcontrast CT scan different threshold and 60 patients in group B were divided again into 4 subgroups （n=15） according the different scan-delay time which peak time plus. The imaging qualities of the cervical ASA were observed and analyzed after the image reconstruction. CT peak values of vertebral artery and ASA on the C4/5 intervertebral plane were measured and compared each other. The actual scan delay time were calculated respectively in the highest display rate subgroups of groups A and B. Results The best threshold of group A was 120 Hu. The best scan delay time of B group was peak time plus 4 s. There was insignificant differences in CT values and actual scan-delay-time between the highest display rate subgroups of groups A and B （P〉0.05）. But the individual actual-scan-delay-time difference （20 seconds） was significant longer in group B than that in group A. Conclusions Although both the optimized Bolus-tracking technique and the Test-bolus technique have a relative high display rate of ASA with 64-detector spiral CT, the optimized Test-bolus technique may reflect the individual principle better compared to the optimized Bolus-tracking technique and should be used first.

关 键 词：颈段脊髓前动脉 CT血管造影 扫描延迟时间 扫描参数 优化 

分 类 号：R445.3[医药卫生—影像医学与核医学] R332.81[医药卫生—诊断学]