MSCT冠状动脉成像质量的影响因素分析

目的：分析64层螺旋CT冠状动脉扫描中影响成像质量的各种因素。方法对89例怀疑冠心病或冠心病复查患者进行64层螺旋CT冠状动脉检查，回顾性分析成像质量，探讨心率及心率波动对冠脉成像质量的影响，pitch值与心率的关系,替代（override）功能的应用价值，从而优化扫描参数。结果心率及心率波动与冠脉成像质量成负相关；心率与扫描/重建方式及pitch值存在相互对应关系；心率替代功能的合理使用可以提高CT冠状动脉的成像质量。结论通过控制心率及心率波动，选择心率替代功能，采取适当的扇区扫描/重建模式可以提高图像质量和冠状动脉诊断的可靠性。

Analysis about Inlfuencing Factors of Image Quality of Coronary Angiography with Multi-Slice CT

Objective To analyze the inlfuencing factors of image quality of coronary angiography with 64-slice CT.Methods Eighty-nine patients with known or suspected CAD underwent CT coronary angiography using 64 multi-slice CT. The image quality in those cases was analyzed retrospectively to evaluate the influence of heart rate, fluctuation of heart rate during the scanning. The relationship between heart rate and the value of pitch was analyzed, and the application value of the override function was discussed.Results① The patient’s heart rate and lfuctuation were negatively related to the coronary image quality.② There was corresponding relationship between the value of pitch and segment scan/reconstruction mode according to the heart rate.③ Correct use of override function could improve the image quality of coronary.Conclusion The appropriate control of heart rate and lfuctuation, the correct use of override function, and the corresponding selection of segment scan/reconstruction mode according to the heart rate could improve the image quality and reliability of coronary angiography.