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Abstract #3181

A Multishot, Hadamard-Encoded Autocalibration Scan for Multiband EPI at 7T

Alexander D. Cohen1, Andrew S. Nencka1,2, and Yang Wang1,2

1Radiology, Medical College of Wisconsin, Milwaukee, WI, United States, 2Biophysics, Medical College of Wisconsin, Milwaukee, WI, United States

A multiband (MB) echo planar imaging (EPI) sequence with multishot autocalibration was developed and implemented at 7T. Slices were unaliased using the principles of Hadamard encoding, resulting in a fully-sampled calibration scan reconstructed without parallel imaging techniques. A Hadamard unaliasing procedure was demonstrated with an acceleration factor of lower rank than the Hadamard encoding matrix. Using this sequence, a functional MRI protocol at 7T was introduced to obtain a sufficient calibration volume, that was then utilized to unalias the remaining repetitions using a slice-GRAPPA technique. Preliminary resting state data acquired using this protocol has generated reliable connectivity networks.

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