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Abstract #1661

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

1 Neuroimaging Research, Barrow Neurological Institute, Phoenix, AZ, United States, 2 Philips 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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