冠状动脉追踪冻结技术在回顾性心电门控下改善冠脉CTA图像质量的应用价值

摘要

目的:评估冠状动脉追踪冻结技术(SSF)在回顾性心电门控下改善冠脉CTA图像质量的效果.方法:117例患者采用回顾性心电门控和单扇区重建技术行冠脉CTA扫描,以心率75次/分为界分为高心率组(38例)和低心率组(79例),分别采用标准算法(STD)和SSF技术进行图像重建,所获图像由本科诊断医师进行分析,以LiKert 5分制评分标准对冠脉整体质量进行评分,要求3分以下者需重新进行检查.结果:117例患者的STD图像的平均得分(4.18)显著低于SSF重建图像(4.42),差异有统计学意义(P＜0.05).高心率组中STD图像的平均得分(3.43)显著低于SSF重建图像(4.02),差异有统计学意义(P＜0.05);而低心率组STD图像的平均得分(4.56)与SSF重建图像(4.62)之间的差异无统计学意义(P＞0.05).结论:冠状动脉追踪冻结技术(SSF)能有效提高冠脉CTA的图像质量,尤其是对心率较快的患者,可提高对高心率患者冠脉成像的可判读性.%Objective:To evaluate the efficacy of coronary artery snapshot freeze (SSF) technique in improving the quality of coronary CT angiography (CCTA) images with retrospective ECG gating.Methods:117 patients underwent coronary CTA scanning with retrospective ECG gating and single sector reconstruction techniques.Taking heart rate (HR) 75/min as cutoff point,patients were divided into high HR group (38 patients) and low HR group (79 patients).The raw data of all patients were reconstructed with standard algorithm (STD) and SSF technique respectively.All of the images acquired were analyzed by the radiologists in our department.A 5-point LiKert scale was used for scoring,patients should be re-examined when the score ＜3.Results:For all of the 117 patients having CCTA,the average score of the CCTA images using STD algorithm was 4.18,which was markedly lower than that of SSF technique (4.42),with statistical difference (P＜0.05).In the high HR group,the average score with STD algorism was 3.43,which was significantly lower than that of SSF technique (4.02),with statistical difference (P＜0.05).However,in the low HR group,there was no statistical difference in the average score between STD and SSF reconstruction algorithm (P ＞ 0.05).Conclusion:Coronary artery snapshot freeze (SSF) technique can improve the image quality of coronary CTA,especially for the patients with high heart rate,thus the image interpretation effectiveness could be enhanced.