Berkin Bilgic1, Huihui Ye1, Lawrence L Wald1, and Kawin Setsompop1
Wave-CAIPI utilizes additional gradients
during the readout to improve controlled aliasing and fully harness coil sensitivity
encoding. Recently proposed CS-Wave extended Wave-encoding with Poisson
sampling and wavelet regularization. This work proposes optimized CS-Wave with i)
tailored data-sampling and ii) highly efficient reconstruction. At 15-fold acceleration,
proposed CS-Wave provides 20% RMSE improvement over Wave-CAIPI, which nearly doubles
the improvement achieved with previously proposed CS-Wave. This permits single
head-orientation Quantitative Susceptibility Mapping at 1×1×2mm3 resolution in 25s.
Combining CS-Wave with SMS Echo-Shift strategy further increases the
acceleration to 30-fold, thus enabling multi-orientation QSM at long-TE from
three head-rotations at 1.5mm isotropic in 72s.