Prospective and retrospective ECG-gated 256-slice CT of coronary stenting:comparison study / 实用放射学杂志

ABSTRACT

Objective To compare image quality and radiation dose of prospective and retrospective electrocardiogram(ECG)-ga-ted 256-slice CT angiography in evaluation of coronary stent.Methods ECG-gated 256-slice CT angiography images of 1 61 cases of coronary heart disease(CHD)patients after stent operation were retrospective analysed,in which patients with stable heart rate were divided into prospective ECG-gated group and restrospective ECG-gated groups.Accooding to normal blood vessels and stent image display,the image quality was divided into four grades:the best,better,good,poor grade,and the quality results were compared. The radiation doses were compared between the two ECG-gated groups.Results In 87 cases (1 58 stents)of prospective ECG gated CT angiography group and 74 cases (159 stents)restrospective ECG-gated CT angiography group the best images were 30 cases (34.5%)and 9 cases (12.2%)(χ2 =10.853,P =0.001),better images 45 cases (5 1.7%)and 41 cases (55.4%)(χ2 =0.218,P =0.641),good ima-ges 12 cases (13.8%)and 21 cases (28.4%)(χ2 =5.22,P =0.022),poor images 0 case and 3 cases(4.0%)(χ2 =1.71 9,P =0.1 90) respectivity.The radiation dose median for prospective ECG-gated angiography group and retrospective ECG-gated angiography group was:5.307 4 mSv,1 7.564 mSv(z = - 10.91 9,P =0.001).The radiation dose of prospective ECG-gated angiography is de-creased by 69.8%.Conclusion For 256-slice CT of coronary stent patient with stable heart rate,image quality of prospective ECG-gated angiography is much better than that of retrospective ECG gated angiography,and the radiation dose of prospective ECG-gated angiography is evident decreased.