Application of new generation snapshot freeze combined with wide-collimation rapid scanning in single-phase coronary CT angiography

JING Yueyue; JIA Yongjun

doi:10.12122/j.issn.1674-4500.2026.01.15

Abstract：Objective To explore the feasibility of coronary CT angiography(CCTA)with prospective single-phase scanning using New Generation Snapshot Freeze(NG SSF)combined with wide collimation and rapid scanning.Methods A total of 47 patients suspected of coronary heart disease who underwent 256-row Revolution APEX CT coronary angiography in our hospital from July 2024 to March 2025 were enrolled.All patients underwent CCTA data acquisition with prospective single-phase scanning based on real-time monitored heart rate:the 75%R-R interval in diastole was selected for heart rate<70 beats/min,and the 45%R-R interval in systole for heart rate≥70 beats/min.The original data were divided into two groups using a self-controlled design,namely the STD group and the NG SSF group,according to whether NG SSF technology was enabled for reconstruction.Two cardiovascular imaging diagnosticians independently scored the image quality of the three major coronary artery branches(left anterior descending branch and left circumflex branch,right coronary artery)in both groups using a 4-point Likert scale.The consistency of image quality evaluation between the two radiologists was analyzed,and the final scores were determined through consultation.Differences in image quality between the two groups were compared and analyzed.Results The two observers showed good consistency in scoring the image quality of the STD group and the NG SSF group(Kappa=0.873-0.937).The image quality of the NG SSF group was significantly better than that of the STD group(all P<0.05).Among the 141 major blood vessels in the STD group,40.43%received a score of 4,36.88%received a score of 3,16.31%received a score of 2,and 6.38%received a score of 1,with an assessable rate(≥3 points)of 94.32%.In the NG SSF group,82.98%of the vessels received a score of 4,17.02%received a score of 3,and there were no vessels with scores of 1 or 2,resulting in an assessable rate of 100%.The average effective dose(ED)of the 47 patients was 1.28±0.45 mSv,showing a significant effect in radiation dose control.Conclusion NG SSF significantly improves the image quality and diagnostic utility of CCTA with prospective single-phase scanning.Combined with wide-collimation prospective single-phase rapid scanning,it facilitates radiation dose reduction while ensuring image quality and diagnostic utility,thus possessing significant clinical application value.