体模实验优化64层螺旋CT冠状动脉成像参数设置

目的探讨改善64层螺旋CT冠状动脉图像质量的条件。方法在不同的心率、不同重组算法、图像重组相位窗下，用心脏冠状动脉模具评价64层螺旋CT冠状动脉图像质量。结果心率小于70次／分，心率波动范围小于10次／分时图像质量最佳；图像质量在R—R间期的75％相位（舒张中期）最好；实验数据共108组，采用单扇区、双扇区、四扇区重组成功率分别为93．5％，91．6％，93．4％，组间差异无统计学意义（r：4．163，P=0．125）。优良率分别为81．8％，79．2％和84．1％。结论心率、重组算法和图像重组相位窗是影响多层螺旋CT冠状动脉成像的主要参数，运用合适参数能获得更优质图像。

Determination of the best image quality parameters in 64-detector CT coronary artery angiography with phantom experiment

Objecitive: To improve the image quality of 64-detector CT coronary artery angiography, and to improve the value in evaluating the lesions of coronary artery through coronary artery phantom experiment. Methods: Evaluating the image quality of 64-detector CT coronary artery angiography with different heart rate, reconstruction algorithm and different phase. Results: The best image quality: heart rate<70bmp, fluctuation<10bmp. 60% experiment group: during 75%R-R (relaxation metaphase ), image quality was the best. Image quality was better with fast heart rate and low fluctuation, single sector reconstruction algorithm. Conclusions: Heart rate, reconstruction algorithm, reconstruction phase time are the main parameters affecting image quality of multi-detector CT coronary artery angiography, high-grade image can be gotten by changing the parameters.