Low radiation dose scanning for CT coronary angiography with 320-slices CT

Objective:To evaluate the method of 320-slice CT with low radiation dose for CT coronary angiography.Methods:Using 320-slice CT,one hundred patients suspected of coronary artery diseases were collected and randomly divided into the study group(improved retrospective ECG-gating coronary artery imaging,50 patients) and the control group(conventional retrospective ECG-gating coronary artery imaging,50 patients).The imaging quality of coronary artery segments and radiation dose were recorded for statistics.Results:The percentage of assessable coronary artery segments was 94.03%(615/654) in the experimental group,whereas 94.68%(605/639) 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:320 slice CT coronary angiography performed with improved retrospective ECG-gating imaging can substantially reduce radiation doses by 72% while preserving good diagnostic image quality.