Mohan Jayatilake1, Judd Storrs2, Jing-Huei Lee2
1Department of Physics and Center for Imaging Research, University of Cincinnati, Cincinnati, OH, United States; 2Department of Biomedical Engineering and Center for Imaging Research, University of Cincinnati, Cincinnati, OH, United States
Magnetic susceptibility variation can lead to B0 field inhomogeneity and cause artifacts including signal dropout and image distortions. Simulated and experimental studies showed that the correction for magnetic field at orbitofrontal cortex (OFC) area required shims with third and higher orders, which are not practically implemented. We propose a novel localized passive shim technique with the use of combined diamagnetic and para/ferromagnetic material to improve the field homogeneity within subjects brains, particularly in the OFC.