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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