Total Current Reduced Design for Brain B 0 Shim Coil using Singular Value Decomposition

Local B ₀ shim coils placed close to the head have been shown to greatly reduce the B ₀ inhomogeneity of the brain. However, the total current increases according to the number of channels which were conventionally 32 or more. Here, we demonstrate a total current reduced brain shim coil design using singular value decomposition (SVD). An 18ch shim coil was designed using SVD to mitigate insignificant currents running in opposite directions. Simulated B ₀ shimming comparison showed that the designed shim coil can greatly reduce the total current compared to conventional local shim coils while maintaining the B ₀ shimming performance.

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