This study introduces a novel MRSI approach using dynamically expanding k-space acquisition during spectral encoding to compensate B0 inhomogeneity related signal losses and spectral line broadening, taking advantage of the sparsity of the spectral signal in the time domain. 2D PEPSI with segmented increases in k-space to a maximum 6x6-fold expansion in kx and ky using spectral time domain and ky undersampling was implemented on a clinical scanner. The study characterizes signal gains and resulting spectral line narrowing in regions with B0 inhomogeneity in phantoms and in vivo. This approach complements emerging hardware solutions for improving higher-order shimming.
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