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Abstract #5010

High Resolution, Free-Breathing Coronary Artery Imaging with >99% Respiratory Efficiency: Comparing Beat to Beat Respiratory Motion Correction with Navigator Gating

Andrew David Scott1,2, Jennifer Keegan, 1,2, David N. Firmin, 1,2

1National Heart and Lung Institute, Imperial College, London, Greater London, United Kingdom; 2Cardiovascular Magnetic Resonance Unit, The Royal Brompton Hospital, London, Greater London, United Kingdom

Respiratory motion correction using highly efficient localized beat-to-beat epicardial fat tracking was compared to standard navigator gating using high resolution right coronary artery imaging. Beat-to-beat corrections were applied to 3D spiral acquisitions (99.3% respiratory efficiency) and navigator gating applied to 3D magnetization-prepared balanced steady-state-free-precession acquisitions (44% efficient) in ten healthy subjects. Quantitative comparison was performed using vessel diameter and vessel sharpness. Results were not substantially different between techniques and the study highlights the importance of the localized nature of the beat-to-beat respiratory-motion-correction.