Joint Water-fat Separation and Deblurring with Spiral In-out Sampling
Dinghui Wang 1 , Zhiqiang Li 1 , Ryan K. Robison 1 , Nicholas R. Zwart 1 , Michael Schr 1,2 , and James G. Pipe 1
Neuroimaging Research, Barrow Neurological
Institute, Phoenix, AZ, United States,
Healthcare, Cleveland, OH, United States
Spiral in-out is an efficient sampling scheme,
especially for spin echo and T2* weighted sequences. Two
images can be reconstructed from the spiral-in and
spiral-out parts respectively. Based on a previous
conjugate gradient method, we propose an iterative
approach to simultaneously separate and deblur water and
fat using these two images with known B0 inhomogeneity.
Ringing artifacts can arise at sharp boudaries since
different frequences at the k-space converge at various
speeds. In-vivo data have confirmed that the ringing
artifacts can be eliminated by the assumption that water
and fat are in phase at time 0.
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