摘要
目的优化椎、颈动脉螺旋 CT 血管成像(SCTA)增强时相,研究增强扫描最佳触发时间和扫描方法,提高椎、颈动脉的三维显示率。方法在对比剂密度监控智能扫描(smartPrep)组133例椎、颈动脉(87例椎动脉、46例颈动脉)SCTA检查中,于足背静脉团注350 mg I/ml 的碘海醇后,应用 SmartPrep 技术优化扫描时相、触发扫描序列完成数据采集,对照组113例同样采用足背静脉团注对比剂,以经验估计延迟18～22 s 后触发扫描,经图像重建和三维重组显示靶血管。结果所有 SmartPrep 组 SCTA (133例,100%)均获成功,其增强时相处于最佳(130例)和较佳(3例)的扫描时期内,靶血管密度阈值在整个扫描周期[(18±4)s]内持续在100 HU 以上,而实际增强扫描的启动时间个体差异明显(15～43 s),误差达28 s。靶血管平均密度[(161.4±2.0)HU]明显高于对照组[(133.3±2.2)HU],差异有统计学意义(t=-9.456,P<0.01)。SmartPrep 组显示满意率为97.74%(130/133),不满意率为2.26%(3/133),失败率为0。对照组显示满意率为76.11%(86/113),不满意率为22.12%(25/113)和失败率为1.77%(2/113)。结论智能扫描技术应用于对比剂密度的实时监控并及时触发增强扫描,能获得满意的增强时相。
Objective To study the optimal enhancement phase and exact triggering scan time on spiral CT angiography of vertebral and carotid artery, and to improve the rate of 3D-CT display in vertebral and carotid artery. Methods One hundred and thirty-three cases of CT angiography of vertebral and carotid artery （87 vertebral and 46 carotid artery） were examined with SmartPrep software, which controled the scan at real time after 100 ml contrast medium （350 mg I/ml Omnipaque） were quickly injected through foot back vein. One hundred and thirteen cases of control group were examined by triggeing off the scanning with a delay time of 15--22 s after blous injection through foot back vein. The vertebral and carotid arteries were demonstrated with 3 dimensional reconstruction. Results The successful rate in SmartPrep group was 100% with the enhancement situated in best （n = 130 ） or good （n = 3 ） scanning phase. The threshold concentration values of target vessel were kept on 100 HU in the whole scan period [ （ 18±4）s]. However, the triggering time of enhancement scanning was not equal （ 15-43 s） and the deviation was up to 28 s. The average concentration of target vessel was obviously higher in SmartPrep group [ （ 161.4±2. 0 ） HU ] than in the control group [（133.3±2.2）HU] （t = -9.456,P 〈0.01）. The satisfaction rate was 97.74% （130/133） ,disaffect rate was 2.26% （3/133）, and failure rate was 0 in SmartPrep group, and the satisfaction rate was 76. 11% （86/113）, disaffect rate was 22. 12% （25/113）, and failure rate was 1.77% （2/113） in the the control group. Conclusion SmartPrep software can exactly carry 6ut enhancement scanning and obtain satisfying enhancement phase when controls of the scan at real time and triggering technique are both used.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2007年第7期753-756,共4页
Chinese Journal of Radiology
基金
上海市医学重点专科建设及科研基金(05Ⅱ025)
