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Abstract #4573

Distortion Correction of Multi-Coil Diffusion-Weighted EPI using the Phase-Based Method: PLACE

Sofia Chavez1, Elizabeth Ramsay1, Masoom Haider1,2, Qing-San Xiang3, Greg Stanisz1,4

1Imaging Research, Sunnybrook Research Institute, Toronto, ON, Canada; 2Department of Radiology, University of Toronto, Toronto, ON, Canada; 3Department of Radiology, University of British Columbia, Vancouver, B.C., Canada; 4Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada

It has been shown that the B0 inhomogeneity distortion occuring in single-coil EPI diffusion weighted images (DWIs) can be corrected using PLACE, a phase-based method. In this work, a method is presented which combines the multi-coil data for the two images required for PLACE while preserving the useful phase information. It is shown that although the inter-coil phase relation is not known, the phase relation between the two EPI acquisitions is coil independent for b=0. Phase difference images are produced for each coil and then complex averaging yields the distorted phase ramp. PLACE can use this to correct magnitude DWIs.