CORRECTION OF B_(0) INHOMOGENEITY DISTORTION IN MAGNETIC RESONANCE SPECTROSCOPIC IMAGING

摘要

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 B_(0) inhomogeneity artifact by using the B_(0) field map and T_(2)~(*) 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 l_(1) norm in the reconstruction.