Receive Array Coil-driven Eddy Current Correction of Diffusion Weighted MRI Data
Negin Yaghmaie1,2, Warda T. Syeda3,4, Yasmin Blunck1,2, Rebecca Glarin1,5, Daniel Staeb6, Kieran O'Brien6, Scott Kolbe7,8,9, and Leigh A. Johnston1,2
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
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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