When the bilateral regions of intersest are far off isocenter like in case of shoulders or for brains of two people to be scanned simultaneously, the image quality often suffers from non-optimal spherical harmonic based shimming routine and higher field inhomogeneity in large off-isocenter regions. To address these challenges, a hybrid active and passive local shimming (HAPLS) technique is proposed to shim two isolated areas in one field of view (FOV) simultaneously. Both the simulation and experimental results validated that HAPLS can complementarily address the bifocal and high-order inhomogeneities in the two-region MRI.
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