Abstract #2480

Parallel Imaging for Concentric Circle Readouts with GRAPPA Reconstruction for Full-Brain 3D-FID-MRSI at 7T

Lukas Hingerl¹, Bernhard Strasser², Philipp Moser¹, Gilbert Hangel¹, Stanislav Motyka¹, Eva Heckova¹, Stephan Gruber¹, Siegfried Trattnig^1,3, and Wolfgang Bogner¹

¹Department of Biomedical Imaging and Image-guided Therapy, High Field MR Centre, Medical University of Vienna, Vienna, Austria, ²Department of Radiology, Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States, ³Christian Doppler Laboratory for Clinical Molecular MR Imaging, Vienna, Austria

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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