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Abstract #1160

Minimization of Respiratory Motion Artifacts for Whole-Heart Coronary MRI: A Combination of Self-Navigation and Weighted Compressed Sensing Reconstruction

Christoph Forman1, 2, Davide Piccini1, Jana Hutter1, 3, Robert Grimm1, Joachim Hornegger1, 3, Michael O. Zenge4

1Pattern Recognition Lab, University of Erlangen-Nuremberg, Erlangen, Germany; 2Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany; 3 Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany; 4MR Application & Workflow Development, Siemens AG, Healthcare Sector, Erlangen, Germany

Recently, self-navigation techniques were introduced for 3D radial in the field of free-breathing, whole-heart coronary imaging. Radial trajectories intrinsically are insensitve for motion during data acquisition. However, Cartesian sampling is superior to radial trajectories in terms of SNR and hardware limitations, e.g. gradient delays. Thus, we propose the application of respiratory self-navigation on an incoherent, undersampled Cartesian trajectory. The effects of residual respiratory motion are minimized by a weighted data fidelity term, exploiting the information derived from the self-navigation, in iterative image reconstruction. In-vivo experiments were performed on four healthy volunteers and compared to navigator-gated acquisition.

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Keywords

able acceptance according acquisition acquisitions advanced affine amplitude anterior application applied artifacts authors balanced beginning biosciences cause channel coil combination combined comparable compensate compressed consuming context coronary correction cost datasets delays denoted derived described desired development diastolic directly distance elements evaluate even explained featuring fidelity field final foundation fully funding furthermore gated gating gradient graduate hardware healthy heart hence identical improvement improvements in vivo incoherent inferior input inspiration integrated interleave introduced iterative kernel materials mathematical matrix measured minimization minimize motion navigated navigation navigator offset optical orientation overall pattern perpendicular pipe placed position press projection properties propose proposed protocol quality radial radiology read readouts received receiver recent recognition reconstructed reconstruction reduce regularized remain remained representing residual respect respiratory sampling scanner school sector selective self sensing sensitivity sharpness software space specifically spine spiral spokes superior suppress suppression technologies term terms though trajectories triggered triggering uncompensated uncorrected variation vessel vessels volunteer volunteers whole width window years