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Abstract #3479

Open-Source, Multi-Vendor B0 Shimming Protocol

Jayden Pothoof1, Niklas Wehkamp2, Jeffrey Fessler3, Maxim Zaitsev2, Douglas Noll1,4, and Jon-Fredrik Nielsen4
1Deparment of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States, 2Department of Radiology, University of Freiburg, Freiburg im Breisgau, Germany, 3Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, United States, 4Department of Radiology, University of Michigan, Ann Arbor, MI, United States

Synopsis

Keywords: Shims, Shims

Motivation: Harmonize the B0 shimming prescan step for multi-site fMRI and MRI studies.

Goal(s): Create an open-source, multi-vendor B0 shimming protocol with equivalent performance to vendors' shimming methods.

Approach: We calibrate shim coil effects to a spherical harmonic basis and use regularized field maps to solve for shim coefficients to improve B0 homogeneity. We compared whole-brain field maps before and after applying our shim tool to both GE and Siemens built-in shimming protocols. We also compare the performance of our tool for the brainstem region.

Results: Our protocol can be run on both vendors and performs similarly to vendor protocols.

Impact: The proposed open-source B0 shimming protocol runs on multiple vendors’ scanners, increasing the harmonization of experimental workflows for multisite MRI and fMRI studies.

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Keywords