论文部分内容阅读
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 investigate the 16-slice CT coronary angiography imaging technique and the factors affecting the image quality. Methods Fifty-two subjects were divided into 2 groups according to heart rate ≤ 70 beats / min and> 70 beats / min. Coronary angiography was performed under 16-slice spiral CT with ECG gating. The results showed that RR between 0% and 100% Twenty-one images (5% at intervals) were selected to display the sharpest one of the left and right coronary arteries. The original data were used to reconstruct the thin-layer images of this phase and then reconstructed MIP, MPR, CPR and VR. The image quality of the two groups was divided into two categories, which can be used for coronary artery evaluation and can not be used for coronary artery evaluation. Results The best reconstructive phase of 16-slice CT coronary angiography was located in 55% -65% R-R interval. 87% (301/346) of the images with heart rate ≤70 beats / min could be used for diagnosis, the heart rate> 70 beats / min, and 78.8% (134/170) of the images could be used for diagnosis. Conclusion The main factors affecting the evaluation of coronary artery coronary artery movement, coronary artery calcification, heart rate fluctuations.