Abstract #0237

Receive Array Coil-driven Eddy Current Correction of Diffusion Weighted MRI Data

Negin Yaghmaie^1,2, Warda T. Syeda^3,4, Yasmin Blunck^1,2, Rebecca Glarin^1,5, Daniel Staeb⁶, Kieran O'Brien⁶, Scott Kolbe^7,8,9, and Leigh A. Johnston^1,2

¹Melbourne Brain Centre Imaging Unit, The University of Melbourne, Melbourne, Australia, ²Department of Biomedical Engineering, The University of Melbourne, Melbourne, Australia, ³Melbourne Neuropsychiatry Centre, The University of Melbourne, Melbourne, Australia, ⁴Department of Medicine, The University of Melbourne, Melbourne, Australia, ⁵Department of Radiology, Royal Melbourne Hospital, Melbourne, Australia, ⁶MR Research Collaborations, Siemens Healthcare Pty Ltd, Australia, ⁷Department of Neuroscience, Central Clinical School, Monash University, Melbourne, Australia, ⁸Department of Radiology, Alfred Hospital, Melbourne, Australia, ⁹Department of Medicine and Radiology, The University of Melbourne, Melbourne, Australia

Synopsis

An eddy current correction algorithm is proposed that exploits the spatially distributed nature of the receive coil array with signal acquisition immediately preceding image readout in PGSE-EPI diffusion-weighted imaging. The array coil phase for each diffusion gradient direction is expanded using spherical harmonics to yield an estimate of the eddy current-induced field shift in the FOV, and the resultant eddy current-induced pixel shift maps. Distortion corrected diffusion-weighted images are subsequently produced using the estimated pixel shift maps for each diffusion direction, with the method demonstrated in phantom and in-vivo 7T experimental data.

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