Gulina Azhati, Presenter: Nothing to Disclose

Wenya Liu, Abstract Co-Author: Nothing to Disclose

Haiting Ma, Abstract Co-Author: Nothing to Disclose

Yan Xing PhD, MD, Abstract Co-Author: Nothing to Disclose

Cunxue Pan PhD, Abstract Co-Author: Nothing to Disclose

Jun Dang, Abstract Co-Author: Nothing to Disclose

jing jing LI, Abstract Co-Author: Nothing to Disclose

Yan Wei Wang MD, Abstract Co-Author: Nothing to Disclose

To access the value of snapshot freeze (SSF) technique in prospective ECG-gated coronary computed tomography angiography (CCTA).

20 patients with suspected coronary heart disease underwent prospectively ECG gated CCTA. All of the CCTA images were reconstructed by both standard (STD) and SSF motion correction. 75％R-R interval were chosed as the central phase for the reconstruction. With a standard 16-segment model in accordance with the SCCT Guidelines, two experienced radiologists evaluated image quality with Likert 4-point score. The image quality and interpretability were assessed on per-segment, per-artery and per-patient level. Comparisons of variables were performed between STD and SSF reconstructions with paired Wilcoxon rank sum test and paired Chi-square test.

For 20 patients(mean age 55.7±10.2 years; male 14, female 6), the mean heart rate was 60.0±7.1 beats/min. SSF reconstructions showed higher interpretability than STD reconstructions on per-segment level [96.1％(272/283) vs 90.8％(257/283)，P=0.011], but there were no significant difference on per-patient level [95％(19/20) vs 80％(16/20)，P=0.210] and per-artery level [96.3％(77/80) vs 90％(72/80)，P=0.211]. Image qualities were higher with the use of SSF than STD reconstructions on per-patient level (3.3±0.4 vs 2.9±0.6，P<0.001) and LAD (3.3±0.5 vs 3.0±0.6，P<0.001), LCX (3.4±0.4 vs 3.1±0.7, P<0.001), RCA (3.0±0.8 vs 2.6±0.8，P=0.003) , but similar on LM (4.0±0.0 vs 3.8±0.7，P=0.180) . Image quality was higher on segment 1、2、3、4、7、8、9、11、13 and 15 with the use of SSF versus STD reconstructions on per-segment level．

SSF could improve the image quality and interpretability in patients undergoing CCTA with prospective ECG-gating.

SSF could improve the image quality of CCTA.Because of the reduction of motion artifacts, it could not only increase the rate of diagnosis but also reduce the influence of heart rate.

Azhati, G, Liu, W, Ma, H, Xing, Y, Pan, C, Dang, J, LI, j, Wang, Y, Improve the Image Quality of Prospective ECG-gated Coronary Computed Tomography Angiography with Snapshot Freeze Technique.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14045738.html