A Joint Prospective-Retrospective Respiratory Navigator for Contrast Enhanced Whole-Heart Coronary MRI

Introduction: Over past decades, several respiratory motion compensation techniques have been studied [1]. Prospective navigator (NAV) is the most commonly used technique to monitor respiratory motion. NAV results in an increase in acquisition time (2-3×) to allow for re-sampling of motion-corrupted k-space lines. Compressed-sensing (CS) for motion compensation has been previously demonstrated in feasibility studies [2, 3].In this study, we sought to evaluate a joint prospective-retrospective NAV to reduce image acquisition time in coronary MRI by estimating the motion-corrupted data. Experiments using prospective non-rigid respiratory motion phantom and in vivo coronary MRI were used to investigate this approach.