宽体探测器CT不同心率段冠状动脉成像质量研究OACSTPCD

Objective:To study the imaging quality and feasibility of coronary artery CT imaging in different heart rate segments,and to provide reference for clinical CCTA without heart rate control.Methods:213 patients with suspected coronary heart disease were randomly selected and divided into three groups according to their heart rate(group A:40-65 bpm,group B:66-89 bpm,and group C:90-117 bpm).A 256-row wide-body detector CT was performed,and the image was reconstructed using coronary artery snapshot freeze technique(SSF).The image quality was evaluated subjectively and objectively according to the 15-segment Coronary artery segmentation method of the American Heart Association.Results:There was no statistical difference in the diagnosability of coronary arteries among all groups(P＞0.05),and there were statistical differences in the subjective scores of coronary artery image quality at different heart rates of vessels in segments 9,13 and 14(P＜0.05).The excellent rate of image quality in group A was the highest,followed by group B and group C.There was statistical difference in radiation dose among all groups(P＜0.05).Conclusion:Wide-body detector CT is feasible for CCTA in different heart rate ranges(40-117 bpm)without the need for heart rate control drugs.However,with the increase of heart rate,the image quality of some small blood vessels decreased.Future research can further optimize scanning parameters and image processing techniques to further improve image quality.