Phantom Results with a Matrix Shim Coil

A 27 cm diameter phantom was placed inside a 3T system consisting of a gradient coil with a 24 channel matrix shim array in a 6x4 array and was used to shim the phantom. The phantom studies demonstrate a 3 times reduction in frequency spread as compared with gradient only shimming across the entire phantom. Slice by slice shimming is shown to further reduce the frequency spread by an additional factor of 2 over a global shim. The low induced gradient voltages in the shim coils and fast switching times demonstrate a potential for dynamic shimming in the future.

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