Slice-Dynamic Shimming for Simultaneous Brain and Spinal Cord fMRI
Christine Law 1 , Haisam Islam 1 , Gary Glover 1 , and Sean Mackey 1
Stanford University, Stanford, CA, United
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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