Abstract #0689

Dynamic Water/Fat Separation and Field Inhomogeneity Mapping at a Temporal Resolution of 40 ms

Zhengguo Tan¹, Dirk Voit¹, Jost M Kollmeier¹, Martin Uecker^2,3, and Jens Frahm^1,3

¹Biomedizinische NMR, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany, ²Department of Diagnostic and Interventional Radiology, University Medical Center Göttingen, Göttingen, Germany, ³DZHK (German Center for Cardiovascular Research), Göttingen, Germany

To achieve dynamic water/fat separation even in the presence of rapid physiological motions and large magnetic field inhomogeneities, this work presents a multi-echo multi-spoke radial FLASH sequence and a model-based non-linear inverse reconstruction. Asymmetric echoes are integrated into the sequence to shorten echo times. A spatial-smoothness constraint on field inhomogeneity maps is developed to counteract local minima in the non-convex inverse problem.

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