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Abstract #4284

Chemical Shift based Fat-Water Separation using a Variational Approach for B0-field Correction

Andreas Lesch1, Kristian Bredies2, Clemens Diwoky3, and Rudolf Stollberger1,4

1Institute of Medical Engineering, Graz University of Technology, Graz, Austria, 2Institute of Mathematics and Scientific Computing, University of Graz, Graz, Austria, 3Institute of Molecular Biosciences, University of Graz, Graz, Austria, 4BioTechMed Graz, Graz, Austria

In this work we present an approach for chemical shift based fat/water-separation using variational methods for the estimation of the underlying B0-field inhomogeneity. We show that the fat/water-problem can be solved by the application of total-generalized-variation (TGV) regularization on the underlying B0-field to enforce piecewise smoothness. With this approach we are able to model huge B0-deviations as well as discontinuities in the B0-field at tissue boundaries with different susceptibility parallel to the main-field. This is shown on different datasets, including two of the ISMRM fat/water-challenge of 2012.

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