Slice-Dynamic Shimming for Simultaneous Brain and Spinal Cord fMRI

Simultaneous brain/spine fMRI has not been adopted due to the challenge of shimming multiple regions of high magnetic field inhomogeneity. A dynamic shim update technique was recently proposed to address this issue that used a separate set of the linear gradients and a frequency offset for the brain and spinal cord. We propose a technique to advance this concept by applying optimal linear shim values on a per-slice basis. Our slice-based technique, which calculates optimal shimming from a field map, would not be possible using the shim procedure provided by a scanner manufacturer.

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