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Abstract #4859

Realization of a synergistic passive and active shimming system to optimize B 0 field homogeneity in micro MR imaging

Rahul Dewal 1 , Zhipeng Cao 2 , Sebastian Rupprecht 3 , and Qing X. Yang 1,3

1 Bioengineering, Penn State College of Medicine, Hershey, PA, United States, 2 Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States, 3 Radiology, Penn State College of Medicine, Hershey, PA, United States

The B 0 field inhomogeneity artifacts near the air-tissue interfaces in animal and human brains at high field are difficult to remove with standard active shim coils as the associated gradients are high-order and highly localized. Several passive and localized active shimming methods have been proposed to deal with this problem but have high calibration or hardware requirements. Here, a synergistic shimming system that simultaneously optimizes the linear active shim coil settings and passive shim element configuration is demonstrated via application to an in vivo mouse brain. This synergistic shimming approach is expected to be extensible to high-field human MRI systems.

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