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Abstract #1615

Method for B0 off-resonance mapping by non-iterative correction of phase errors

Junmin Liu 1 , David W Holdsworth 1,2 , and Maria Drangova 1,2

1 Imaging Research Laboratories, Robarts Research Institute, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada, 2 Department of Medical Biophysics, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada

Phase unwrapping techniques are conventionally used for B0 mapping. However, perfect unwrapped phase images are still very difficult to obtain. We present a novel non-iterative phase-unwrapping-based field mapping method. The method uses a raw fat-fraction map estimated from multi-echo magnitude images followed by histogram analysis of phase images to generate an accurate B0 map; both global and local phase errors are removed. The method is tested with a large number of data sets, including all cases from 2012 ISMRM Challenge.

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