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Abstract #3947

Characterization and Correction of Diffusion Gradient-Induced Eddy Currents in Echo-Planar and Spiral Cardiac Diffusion Tensor Imaging

Robbert J.H. van Gorkum1, Christian Guenthner1, Andreas Koethe1,2, Christian T. Stoeck1,3, and Sebastian Kozerke1
1Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland, 2Center for Proton Therapy, Paul Scherrer Institute, Villigen, Switzerland, 3Division of Surgical Research, University Hospital Zurich, University Zurich, Zurich, Switzerland


Second-order motion-compensated diffusion encoding gradient waveforms cause substantial eddy currents (ECs), which can violate the linear-system assumption of a gradient impulse response function and thus require a dedicated measurement and reconstruction approach. Using a 3-dimensional spectroscopic imaging method, diffusion encoding gradient-induced ECs were characterized and non-linear effects were identified. When accounting for zeroth- and first-order diffusion encoding gradient-induced ECs besides off-resonance and trajectory-induced concomitant fields and ECs, image distortions could be adequately mitigated in echo-planar and spiral in vivo second-order motion-compensated cardiac diffusion tensor imaging sequences.

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