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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