Hadamard Encoded Time-Dependent Phase Constraint Parallel Image Reconstruction

Jacob R. Hoberg¹, Nan-Kuei Chen¹

The use of the multi-band parallel imaging along the slice-select direction in fMRI can increase the throughput without signal reduction resulting from k-space undersampling as in conventional parallel acceleration along the phase-encoding direction. However, the multi-band parallel imaging is still susceptible to noise amplification due to non-ideal sensitivity profile. The existing methods may not improve the SNR when the simultaneously excited bands are not spatially far apart. The purpose of this work is to present a novel method that integrates Hadamard slice encoding and time-domain phase constrained reconstruction, to eliminate the noise amplification of multi-band parallel.