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Ultrafast, 3D 1H-MRSI of the brain from another 5 min scan without water suppression using the learned subspace: (a-d) Reconstructed metabolite maps of NAA, Cr, Cho and mI for different slices across the 3D volume; (e) anatomical images with contrast reconstructed from the unsuppressed water signals; (f) tissue quantitative susceptibility maps (QSM) obtained from the phase variations encoded in the water spectroscopic signals.
