Meng Zhang, Presenter: Nothing to Disclose

Hong Zeng MD, PhD, Abstract Co-Author: Nothing to Disclose

Zhongwen Lv, Abstract Co-Author: Nothing to Disclose

Lin Liu MD, PhD, Abstract Co-Author: Nothing to Disclose

A novel non-rigid registration based motion correction algorithm (Snap-Shot-Freeze, SSF) has been recently introduced for coronary CTA. The aim of this study was to evaluate the efficiency of SSF in coronary CTA, by comparing the image quality with that of single sector and multi-sector reconstructions.  

Coronary CTA was performed with a 64-row MDCT scanner (GE, Discovery HD750) on 123 patients with mean heart rates of 68 bpm (range:58-75 bpm）. Both single sector and bisector multiphase reconstruction were performed to select the optimal cardiac phase for each reconstruction method. SSF reconstruction and motion correction was performed based on the optimal single sector reconstruction to generate the SSF images. The image quality was then evaluated by two blinded and independent observers on workstation using a 5-point scale(5=excellent to 1=non-diagnostic) and the image quality of the three reconstruction methods was compared.  

Totally 984 segments of coronary artery from 123 patients were analyzed. There was good inter-observer agreement (k=0.85). The average scores of the groups with single sector (A)，bi-sector (B) and SSF (C) were2.56±0.12,3.01±0.23 and 3.78±0.09, respectively. On segment based analysis, the percentage of acceptable image quality no less than score 3 was83.6%，89.4% and 93.4%，respectively，with significant difference between groups A and C（x2=5.24, p＜0.05）, B and C（x2=6.47, p＜0.05）. The percentage of good image quality no less than score 4 was 40.6%，52.1 and 59.7%，respectively, with significant difference between A and C（x2=15.47，p＜0.05）, B and C（x2=12.13，p＜0.05).  

SSF can effectively improve the image quality of coronary CTA in patients with high heart rates.  

As a new method to reduce the motion artifact of coronary artery, SSF will expand the use of ECG-gated coronary CTA.  

Zhang, M, Zeng, H, Lv, Z, Liu, L, Improving the Image Quality of Coronary CTA Using a Novel Non-rigid Registration Based Motion Correction Algorithm: In Comparison with Bi-sector Reconstruction  .  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14018192.html