Feasibility of coronary artery angiography using prospective ECG-triggering acquisition with 100 kV in non-obese pa-tients

CHI Shuping; CHENG Zhaoping; WANG Ximing; LI Lei

Abstract：Objective To evaluate the feasibility of prospective ECG-triggering acquisition with 100 kV technique in coronary artery angiography of non-obese patients .Methods 118 patients with clinically suspected coronary heart disease were scanned by four different protocols:patients in group 1 and 2, retrospective ECG-gated acquisition with 120 kV and 100 kV were used respec-tively;patients in group 3 and 4, prospective ECG-triggered acquisition with 120 kV and 100 kV were used, respectively.En-hancement and noise of the ascending aorta were quantified .Signal-to-noise ( SNR) , contrast-to-noise ratis ( CNR) was calculat-ed and subjectiveimage quality was evaluated .Quantitative data were expressed as means ± standard deviations and categorical data were given in proportions and percentages .Results The BMI of 118 cases of four groups were not statistically different ( P>0.05).The enhancement and image noise in group 1 and group 3 were lower than group 2 and group 4, and there was statisti-cally difference ( P <0.05); The SNR and CNR were highest in protocol 1, and there was statistically difference in the four groups ( P <0.05).There was no statistically significant difference in SNR and CNR between group 2, 3 and 4 ( P >0.05). There was no statistically significant difference in subjective image quality in the four groups ( P >0.05).Effective dose (ED) in group 4 was (1.60 ±0.16) mSv, and there was significant reduction in group 4 than that in other groups ( P <0.05).Con-clusion In non-obese patients with a stable heart rate , coronary artery angiography performed by prospective ECG-triggered ac-quisition with 100 kV may obtain the diagnostic image with significant reduction of radiation dose .