We present here a new method for rapid MRSI of the brain on 7T that combines fast rosette trajectories and subspace-based processing from the SPICE MRSI framework. Results from in vivo experiments demonstrated substantial improvement in spectral quality and SNR achieved by the subspace imaging method over the standard reconstruction of rosette MRSI data. The ability to obtain single-slice rapid MRSI of the brain with an only 1.1 min acquisition was also demonstrated using the subspace-based reconstruction. These results highlight the potentials of integrating subspace imaging and fast acquisitions to push the performance of ultrahigh-field MRSI.
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