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 Trattnig^1,4, Wolfgang Bogner¹, and Gilbert Hangel^1,3

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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