影响CT冠状动脉成像图像质量因素的探讨

The evaluation of CT coronary angiographic quality

目的:探讨16层螺旋CT冠状动脉造影成像图像质量的影响因素。方法:采用回顾性心电门控技术,CT联动扫描序列,对92例患者进行CT平扫和增强扫描,利用CT特殊软件对冠状动脉进行重建成像。结果:92例患者中。心率小于60次/min的45例,共180支冠状动脉,显示清楚的133支(77.4%),心率在60次/min～70次/min的29例,共116支冠状动脉,显示清楚的87支(75.0%),心率在70次/min～80次/min的18例,共72支冠状动脉,显示清楚的52支(72.2%)。结论:CTCA图像的质量与时间分辨率、空间分辨率、重建时相的正确选择、对比剂的应用及重建方式有密切的关系,根据患者不同的心率,采取不同的心脏扫描条件,对冠状动脉进行造影扫描,能获得理想的原始数据,重建出较理想的冠状动脉,充分显示三级以上的冠状动脉的狭窄、变异、钙化和支架的通畅情况,作为一种无创检查,是临床上筛选冠心病较好的的手段。

Objective To evaluate the influence factor of imaging quality of 16-slice spiral CT coronary angiography (MSCTCA).Method Adopting retrospective ECG-gated MSCTCT,plain scanning and enhancement Scanning were per- formed in 92 patients,then chromatograms were reconstructed by using special CT software.Results In 92 patients,here were 45 cases with heart rate of lower than 60,180 coronary arteries(CA)were showed in all,in which 133 CA(77.4%)were showed clearly.There were 29 cases with 60-70 bpm,87 CA(75.0%)were showed clearly in all-showed 116 CA.There were 18 cases with 70-80 Bpm,52CA(72.2%)were showed clearly in all-showed 72 CA.Conclusion There is a close relationship between CTCA image quality and correct choice of parameters(time resolution,sputiul resolution,reconstruction phase),application of constrast medium,styles of reconstruction.According to difference HR of patients,we carry out ex- amination of CTCA by adopting difference scanning conditions to achieve ideal raw data to recon strict ideal CA.Finally,nar- row,variation,calcification,smooth status of bracket in CA above three-grade can be showed sufficiently.MSCTCA is a noninvasive method of examination,by which coronary artery diseases(CAD)can be tilted on clinic.