Research on low radiation dose scanning for CT coronary angiography with adaptive statistical iterative reconstruction(ASIR) on a high-definition CT(HDCT)

Objective To evaluate the dose reduction potential of an adaptive statistical iterative reconstruction(ASIR) on a high-definition CT(HDCT) for imaging coronary angiography.Methods Using HDCT,one hundred patients suspected of coronary artery diseases were collected and randomly divided into the study group(AsiR improved retrospective ECG-gating coronary artery imaging,50 patients)and the control group(conventional retrospective ECG-gating coronary artery imaging,50 patients).The radiation dose and imaging quality of coronary artery segment were recorded for statistics.Results The percentage of assessable coronary artery segments was 95.0% in the experimental group,whereas 95.8% in the control group.There was no significant difference of imaging quality between the two groups(P0.05).The mean effective dosage(ED) in the experimental group was(2.90±0.37)mSv and(10.33±1.65)mSv in the control group.There was significant difference between radiation dose of the study group and that of the control group(P0.05).Conclusion HDCT coronary angiography performed with improved retrospective ECG-gating imaging can substantially reduce radiation doses by 72% while preserving good diagnostic image quality.