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Comparison of self‐gated cine MRI retrospective cardiac synchronization algorithms
Author(s) -
Nijm Grace M.,
Sahakian Alan V.,
Swiryn Steven,
Carr James C.,
Sheehan John J.,
Larson Andrew C.
Publication year - 2008
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.21514
Subject(s) - mean squared error , synchronization (alternating current) , algorithm , image quality , root mean square , polynomial , computer science , matching (statistics) , peak signal to noise ratio , noise (video) , mean difference , image (mathematics) , artificial intelligence , mathematics , pattern recognition (psychology) , channel (broadcasting) , statistics , physics , computer network , mathematical analysis , quantum mechanics , confidence interval
Purpose To determine whether improved self‐gating (SG) algorithms can provide superior synchronization accuracy for retrospectively gated cine MRI. Materials and Methods First difference, template matching, and polynomial fitting algorithms were implemented to improve the synchronization of MRI data using cardiac SG signals. Cine datasets were acquired during short‐axis, two‐, three‐, and four‐chamber cardiac MRI scans. The root‐mean‐square (RMS) error of SG synchronization positions compared to detected R‐wave positions were calculated along with the mean square error (MSE) and peak signal‐to‐noise ratio (PSNR) comparing SG to electrocardiogram (ECG)‐gated images. Overall image quality was also compared by two expert reviewers. Results RMS errors were highest for the first difference method for all orientations. Improvements for both template matching and cubic polynomial fitting methods were significant for two‐, three‐, and four‐chamber scans. MSE values were lower and PSNR were significantly higher for the cubic method compared to the first difference method for all orientations. Reviewers scored the images to be of comparable quality. Conclusion Template matching and polynomial fitting improved the accuracy of cardiac cycle synchronization for two‐, three‐, and four‐chamber scans; improvements in SG synchronization accuracy were reflected in improvements in analytical image quality. Implementation of robust postprocessing algorithms may bring SG approaches closer to clinical utilization. J. Magn. Reson. Imaging 2008;28:767–772. © 2008 Wiley‐Liss, Inc.