16层CT冠状动脉造影的技术及影响图像质量的因素  

16-slice Spiral CT Coronary Angiography:The Technique and Influence Factors of Image Quality

作　　者：孙益芳[1] 邢伟[1] 陈文华[1] 吴小凤[1] 王士英[1] 许金梅[1] 何小兰[1] 王慧[1] 聂建新[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：《实用放射学杂志》2007年第12期1692-1695,共4页Journal of Practical Radiology

摘　　要：目的探讨16层CT冠状动脉造影的成像技术及影响图像质量的因素。方法52例受检者按心率≤70次/min和>70次/min分为2组,分别行16层螺旋CT心电门控条件下冠状动脉造影,预览R-R间期0%～100%的21幅图像(间隔5%),选择显示左、右冠状动脉最清晰的一幅,应用原始数据重建该时相的薄层图像,再进行MIP、MPR、CPR、VR重建。2组图像质量均分为能用于冠状动脉评价和不能用于冠状动脉评价2类。结果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。心率≤70次/min组,有87%(301/346支)的图像可用于诊断,心率>70次/min组,有78.8%(134/170支)的图像可用于诊断。结论影响冠状动脉评价的因素主要有冠状动脉运动、冠状动脉钙化、心率波动等。Objective To evaluate the imaging technique and influence factors of image quality with 16 - slice spiral CT coronary angi- ography. Methods Group 1 and 2 were divided according to their heart rate （≤70 bpm and 〉 70 bpm ） in 52 subjects underwent ECG - gated 16 - slice spiral CT angiography. 21 images at 0% - 100% of the cardiocycle （interval of 5% ） were previewed and the image showing left and right coronary artery clearly was chosen, the thin slice images at this phase were reconstructed using original images. 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 reconstructed phase of 16 -slice spiral CT coronary angiography was commonly 55% -65% R -R phases. 87%（ 301/346）of the coronary segments was sufficient for analysis in patients with heart rate ≤70 bpm , and 78.8%（134/170） with 〉70 bpm. Conclusion Image quality of CT coronary angiography is highly dependent on coronary artery movement, coronary artery calcification and heart rate fluctuation.

关 键 词：心脏 冠状动脉 心血管造影术 体层摄影术 X线计算机 

分 类 号：R322.1[医药卫生—人体解剖和组织胚胎学] R814.43[医药卫生—基础医学]