Non-Cartesian sampling methods for MRSI such as concentric ring trajectories (CRT) are highly suitable at field strenghts ≥7T while being SNR-efficient due to its self-rewinding property and low-pass k-space-weighting. However slewrate constraints enforce the CRT to sample the k-space periphery with 2-fold or 3-fold the time of the inner circles via more temporal interleaves (TI). The combination of variable density parallel imaging (PI) and CRT for MRSI allows high acceleration factors since the undesired but necessary variable TIs can be easily undersampled and allowing therefore higher accelerations in the k-Space periphery.
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