Abstract #3772

An open toolbox for harmonized B0 shimming

Jon-Fredrik Nielsen¹, Berkin Bilgic^2,3, Jason P Stockmann², Borjan Gagoski⁴, Jr-Yuan George Chiou⁵, Lipeng Ning⁶, Yang Ji⁶, Yogesh Rathi⁵, Jeffrey A Fessler⁷, Douglas C Noll¹, and Maxim Zaitsev⁸

¹fMRI Laboratory, University of Michigan, Ann Arbor, MI, United States, ²Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ³Harvard Medical School, Boston, MA, United States, ⁴Fetal-Neonatal Neuroimaging and Developmental Science Center, Boston Children's Hospital, Boston, MA, United States, ⁵Radiology, Brigham and Women’s Hospital, Boston, MA, United States, ⁶Psychiatry, Brigham and Women’s Hospital, Boston, MA, United States, ⁷Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, United States, ⁸High Field MR Center, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria

Commercial MRI scanners are typically equipped with linear and 2nd-order (spherical harmonic) shim channels that offer some control of the B0 field, but the shim settings are usually adjusted automatically and non-transparently during the scanner’s prescan routine with little or no user input. This practice makes it difficult to ensure consistent experimental conditions across sessions and sites, and may lead to suboptimal shim settings for a given application. We introduce an open toolbox for ‘harmonized’ B0 shimming across sites and vendor platforms, that makes full use of all available shim channels.

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