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Abstract #2221

Improving the B0 homogeneity in 7 T MRSI applications using a 24-channel local array of shim coils

Philipp Lazen1, Sahar Nassirpour2, Paul Chang2, Lukas Hingerl1, Karl Rössler3, Siegfried Trattnig1,4, Wolfgang Bogner1, and Gilbert Hangel1,3
1Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria, 2MR Shim GmbH, Reutlingen, Germany, 3Department of Neurosurgery, Medical University of Vienna, Vienna, Austria, 4Christian Doppler Laboratory for Clinical Molecular MR Imaging, Vienna, Austria

A 24-channel array of local shim coils in a 7 T Siemens Terra Fit was tested on eight healthy volunteers. Significant improvements of the homogeneity of the static magnetic field could be achieved and were qualitatively shown and quantitatively analyzed. The standard deviation of the resonance frequency decreased from 42.5 Hz for the standard shim (up to second order spherical harmonics) to 34.5 Hz for the 24-channel local shim array. The full width at half maximum and the signal to noise ratio also improved with the better shim. Lastly, some preliminary MRSI results could be gathered.

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