新一代冠状动脉运动追踪冻结技术用于改善不同心率患者冠状动脉CT血管成像质量  

New-generation snapshot freeze technology for improving image quality of coronary CT angiography in patients with varying heart rates

作　　者：安备[1] 张卓璐 刘卓[1] 付玲[1] 商旭[1] 刘磊 程瑾[1] AN Bei;ZHANG Zhuolu;LIU Zhuo;FU Ling;SHANG Xu;LIU Lei;CHENG Jin(Department of Radiology,Peking University People’s Hospital,Beijing 100044,China)

机构地区：[1]北京大学人民医院放射科,北京100044

出　　处：《中国介入影像与治疗学》2025年第2期131-135,共5页Chinese Journal of Interventional Imaging and Therapy

摘　　要：目的观察新一代冠状动脉追踪冻结(NG SSF)技术用于改善不同心率(HR)患者冠状动脉CT血管成像(CCTA)质量的效果。方法回顾性分析利用256排CT机于1个心动周期内采集的164例CCTA数据,管电压分别为80、100及120 kV,以智能心电门控技术判断HR并自动选择曝光期相:对HR≤65次/分者(低HR组)将曝光时间窗设在70%~80%R-R间期,65次/分<HR≤85次/分者(中等HR组)设在40%~80%R-R间期,HR>85次/分(高HR组)者设在40%~60%R-R间期;对3组图像分别以标准重建算法(STD)、第一代追踪冻结(SSF1)技术及NG SSF进行重建。以Likert量表对3种图像所示右冠状动脉(RCA)、左前降支(LAD)及左回旋支(LCX)各节段进行主观评分。结果低HR组NG SSF重建图像中的LAD中远段、RCA及LCX全段得分均高于STD,而NG SSF重建图像中的RCA中段及LAD远段得分高于SSF1重建图像(P均<0.05);中等HR组NG SSF重图像显示冠状动脉各节段的主观评分均高于STD及SSF1重建图像(P均<0.05);高HR组NG SSF重建图像显示冠状动脉各节段的主观评分均高于STD,显示RCA近远段、LAD中远段及LCX全段的主观评分均高于SSF1重建图像(P均<0.05)。结论利用NG SSF技术能有效提升不同HR患者前瞻性心电门控CCTA成像质量。Objective To investigate the effectiveness of new-generation snapshot freeze(NG SSF)technology for improving image quality of coronary CT angiography(CCTA)in patients with different heart rate(HR).Methods CCTA data of 164 patients obtained with a 256-row CT scanner and voltages of 80,100 and 120 kV,respectively,in one cardiac cycle were retrospectively analyzed.Smart electrocardiogram(ECG)gating technology was used to calculate patient’s HR and choose automatic exposure phase.For these with HR≤65 beats/min(low HR group),the exposure time window was set between 70%—80%R-R interval,for 65 beats/min<HR≤85 beats/min(medium HR group)was set between 40%—80%R-R interval,while for those HR>85 beats/min(high HR group)was set between 40%—60%R-R interval.Standard reconstruction(STD),the first-generation snapshot freeze(SSF1)and NG SSF were performed to reconstruct CCTA images,respectively.Subjective scoring of each segment of right coronary artery(RCA),left anterior descending(LAD)and left circumflex artery(LCX)shown on CCTA were performed based on Likert scale.Results In low HR group,the scores of middle and distal segments of LAD and all segments of RCA and LCX on NG SSF CCTA were significantly higher than on STD,and of middle segment of RCA and distal segment of LAD were both higher than on SSF1(all P<0.05).In medium HR group,the scores of all branches on NG SSF CCTA were significantly higher than on STD or SSF1 CCTA(all P<0.05).In high HR group,the scores of coronary branches showed on NG SSF CCTA were all significantly higher than on STD CCTA,while of the proximal and distal segments of RCA,middle and distal segments of LAD and all segments of LCX were significantly higher than on SSF1 CCTA(all P<0.05).Conclusion NG SSF could effectively enhance image quality of prospective ECG-gated CCTA in patients with varying HR.

关 键 词：冠状动脉疾病 CT血管成像 前瞻性心电门控扫描 追踪冻结技术 

分 类 号：R543.3[医药卫生—心血管疾病] R814.42[医药卫生—内科学]