Abstract #4582

Slice-wise z-shimming for spinal cord fMRI with Shimming Toolbox

Alexandre D'Astous¹, Merve Kaptan², Daniel Papp¹, Alice Dabbagh², Jürgen Finsterbusch³, Falk Eippert², Eva Alonso-Ortiz¹, and Julien Cohen-Adad^1,4,5,6

¹Neuropoly Lab, Institute of Biomedical Engineering, Polytechnique Montreal, Montreal, QC, Canada, ²Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany, ³Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany, ⁴Mila - Quebec AI Institute, Montreal, QC, Canada, ⁵Functional Neuroimaging Unit, Centre de recherche de l'Institut universitaire de gériatrie de Montréal, Montreal, QC, Canada, ⁶Centre de recherche du CHU Sainte-Justine, Université de Montréal, Montreal, QC, Canada

Synopsis

Keywords: Shims, Spinal CordSpinal cord fMRI is challenging, in part due to B0 inhomogeneities. An EPI, z-shimming signal intensity based approach was implemented to automatically and dynamically shim the spinal cord. The technique was implemented in the open-source Shimming Toolbox. Z-shimming was tested on a healthy participant and showed a 14% increase in signal intensity as well as 19% increase in tSNR. The technique was generalized to allow for the use of any shim coil geometry as well as non-EPI data.

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