New-generation snapshot freeze technology for improving image quality of coronary CT angiography in patients with varying heart rates
10.13929/j.issn.1672-8475.2025.02.011
- VernacularTitle: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
- Author:
Bei AN
1
;
Zhuolu ZHANG
1
;
Zhuo LIU
1
;
Ling FU
1
;
Xu SHANG
1
;
Lei LIU
1
;
Jin CHENG
1
Author Information
1. 北京大学人民医院放射科,北京 100044
- Publication Type:Journal Article
- Keywords:
coronary artery disease;
computed tomography angiography;
prospective electrocardiogram gating scan;
tracking freeze technology
- From:
Chinese Journal of Interventional Imaging and Therapy
2025;22(2):131-135
- CountryChina
- Language:Chinese
-
Abstract:
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.
