Abstract #3181

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

Alexander D. Cohen¹, Andrew S. Nencka^1,2, and Yang Wang^1,2

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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