Correction of B0 inhomogeneity distortion in magnetic resonance spectroscopic imaging

In this paper we reconstruct the 3-D MR spectroscopic data acquired using an echo-planar spectroscopic imaging (EPSI) sequence. We propose to compensate for B₀ inhomogeneity artifact by using the B₀ field map and T₂* decay estimated from a higher resolution, multi-slice proton imaging data scanned with similar shimming to the EPSI one. We employ total variation (TV) regularization to obtain more uniform spectral peaks and lineshapes, and exploit the sparsity of the spectral data by using the lscr₁ norm in the reconstruction.