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Abstract:
Ultra-high field (UHF) magnetic resonance imaging (MRI) enables functional brain images with sub-millimeter spatial resolution. However, susceptibility induced magnetic field (B0) variations within tissue are the source of various artifacts. Shim coils of different shape and size are applied to reduce these B0 inhomogeneity. However, most shim coils only have a regular shape and distribute current pattern on a cylinder surface or close-fit helmet. The difference in performance between current multi coil array and irregular shape multi coil array has not been explored. The optimization methods for multi-coil shim arrays are discussed, together with design and construction procedure.
