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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