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Abstract #0362

Extended Parallel Imaging in Alternating-SSFP fMRI

Tiffany Jou 1 , Joseph Y Cheng 2 , Chris Bowen 3 , Michael Lustig 4 , and John M Pauly 1

1 Electrical Engineering, Stanford University, Stanford, CA, United States, 2 Radiology, Stanford University, Stanford, CA, United States, 3 Radiology, Dalhousie University, Halifax, NS, Canada, 4 Electrical Engineering and Computer Sciences, UC Berkeley, Berkeley, CA, United States

By using RF catalyzation to alternate between two RF phase-cycling steady states, Alternating-SSFP (alt-SSFP) suppresses banding artifacts in conventional Passband Balanced-SSFP (pb-SSFP) and allows for whole-brain fMRI in a single functional run. In this work, we demonstrate that due to the offset banding patterns of different phase-cycling, the coil sensitivity maps of alternate phase-cycling volumes can be used as additional maps to enhance the conditioning of the parallel imaging reconstruction of the alt-SSFP phase-cycled images. This increases temporal SNR for alt-SSFP fMRI in highly accelerated cases.

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