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.