Fast kq-Space Sampling with Motion-Induced Phase in Diffusion MRI

High spatio-angular resolution diffusion MRI (dMRI) has been shown to provide accurate identification of complex fiber configurations. However, its application in clinics remains limited due to the long acquisition time that it requires. Recently, we have developed a method relying on a kq-space under-sampling scheme to recover the intra-voxel fiber configurations through accelerated acquisitions. In the current work, we generalize our method to consider a more realistic setting. In particular, the phase contamination induced by magnetic field inhomogeneities and motion during the signal acquisition has been included in the kq-space measurement model. Through experiments on realistic synthetic data, we show that the phase contamination does not penalize the recovery of the fiber configuration, when the phase factor is assumed to be perfectly known.