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Abstract #0922

Correcting Eddy Current Induced Geometric Distortion for High Resolution Multi-Band Diffusion Weighted SE-EPI with Magnetic Field Monitoring at 7T

Ruoyun Emily Ma1, Mehmet Akcakaya1,2, Steen Moeller1, Edward Auerbach1, Kamil Ugurbil1, and Pierre-Fran├žois Van de Moortele1

1Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 2Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, United States

DW-EPI suffers from geometric distortion induced by eddy current from strong diffusion gradients. Magnetic field monitoring using 19F probes followed by algebraic reconstruction incorporating higher order field perturbation has been proposed to address such issue and was applied for single-band acquisition at 3T. In this study, this approach was implemented for high resolution multiband in vivo brain DW-EPI acquisition at 7T, taking into account of scanner imposed global phase modulation for eddy-current correction. Preliminary results showed successful correction of the geometric distortion across all diffusion gradients. Further investigation needs to be made to increase the SNR of DW images.

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