16层CT冠状动脉成像的技术优化  

The technical optimization of 16-slice CT coronary angiography

作　　者：孙益芳[1] 陈文华[1] 邢伟[1] 吴小凤[1] 王士英[1] 许金梅[1] 王慧[1] 张敏[1] 

机构地区：[1]苏州大学第三附属医院影像科,江苏常州213003

出　　处：《医学影像学杂志》2006年第9期914-916,共3页Journal of Medical Imaging

摘　　要：目的：探讨时相预览法在16层CT冠状动脉成像时相选择中的价值。方法：将52例疑冠心病的患者根据心率分为二组：第一组心率≤70次／min32例，第二组心率〉70次／min20例，进行16层CT冠状动脉扫描，采用回顾性心电门控、0.42s螺旋扫描、0．75mm准直器宽度。选取增强扫描图像的右冠脉中部层面，运用时相预览序列预览R．R心动周期0％-100％的21幅图像（间隔5％），选择显示左、右冠脉最清晰的一幅，记录其时相。对第一组采用单扇区重建算法，对第二组采用双扇区重建算法，应用原始数据重建最佳时相的薄层图像，再进行MIP、MPR、CPR、VR重建。结果：第一组单扇区重建的最佳时相为55％-65％R-R间期。第二组双扇区重建的最佳时相为60％-65％R-R间期（12／20），其次是35％-40％R-R间期（5／20）和70％-75％R-R间期（3／20）。结论：运用时相预览序列优选重建时相可以明显提高工作效率，16层CT冠状动脉成像的最佳重建时相多位于55％-65％R-R间期。Objective：To assess the clinical value of the phase previewing in16-slice spiral CT coronary angiography. Methods：52 patients who were suspected to coronary artery disease were classified into two groups according to heart rate（ Group 1 ≥70bpm and Group 2 〉 70bpm）, Group 1 has 32 patients and group 2 has 20 patients. 52 patients were studied with 16-slice spiral CT （ retrospectively ECG- gating; 0.42s rotation;0,75mm collimating apparatus width）. Choosing central deck of right coronary artery in enhancement scanning images, previewing 21 images at 0% - 100% of the cardiocycle in increments of 5% by the phase previewing, selecting the most clear image of left and right coronary artery,and recording the phase, Group 1 and group 2 was respectively applied by two-sector reconstruction algorithm and single-sector reeoustmetion algorithm. Raw data were reconstructed with thin images at the best phase. All images were reconstructed in the mode of maximum intensity projection （MIP）, multi-plane reformation （MPR）, curved planar reformation（CPR） and volume rendering （VR）. Image quality of two groups was assessed for each coronary as able and unable to be diagnosed. Results：The best phase of group 1 is 55% - 65% R-R phases, the best phase of group 2 is 60% - 65% R-R phases（ 12/20）, the second phase is 35 % - 40 % R-R phases（5/20）and 70 % - 75 % R-R phases（3/20）. Conclusion： The previewing phase optimization can raise work efficiency, and the best reconstructed phase of 16-slice spiral, CT coronary angiography is commonly 55% - 65% R-R intervals.

关 键 词：冠状动脉 心血管造影术 体层摄影术 X线计算机 

分 类 号：R514.4[医药卫生—内科学] R814.42[医药卫生—临床医学]