Abstract #1251

Comparison of Acceleration Methods for Brain MRSI at 7T

Bernhard Strasser¹, Lukas Hingerl¹, Borjan A Gagoski², Philipp Moser¹, Gilbert Hangel¹, Siegfried Trattning^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 Electrical Engineering and Computer Science, MIT, Cambridge, MA, United States, ³Christian Doppler Laboratory for Clinical Molecular MR Imaging, Medical University of Vienna, Vienna, Austria

In this work three different acceleration methods, 2D-CAIPIRINHA with phase-encoding, spiral encoding and concentric circles (CONCEPT) for brain MRSI at 7T were compared. The metabolic maps were compared qualitatively, and the CRLB and SNR values were compared quantitatively. The metabolic maps of 2D-CAIPIRINHA with phase-encoding provided the best data with respect to metabolic maps, CRLB and SNR values. Improving the PSF by increasing the matrix size from 48x48 to 64x64 enhanced the data quality again for CONCEPT. Spiral and CONCEPT encoding are prone to spectral baseline distortions. Nevertheless, CONCEPT has a high potential for high resolution brain MRSI at 7T.

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