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.
