Abstract #4335
Mitigate B1+ inhomogeneity by the combination of RF shimming and B1+ remapping using nonlinear gradient coils
Yi-Cheng Hsu 1 , Ying-Hua Chu 1 , Riccardo Lattanzi 2 , Daniel K Sodickson 2 , and Fa-Hsuan Lin 1,3
1
Institute of Biomedical Engineering,
National Taiwan University, Taipei, Taiwan,
2
The
Bernard and Irene Schwartz Center for Biomedical
Imaging, Department of Radiology, New York University
School of Medicine, NY, United States,
3
Aalto
University, Finland
To mitigate B1+ inhomogeneity in high field MRI, we
proposed to combine RF shimming and B1+ remapping using
SpAtially selective RF excitation with Generalized
Spatial encoding magnetic fields (SAGS) method. Using
both numerical simulations and experimental data, we
demonstrate that such a combined strategy can provide
the most homogeneous transverse magnetization
distribution without the complexity of a full parallel
RF transmission system. Compared to using RF shimming
alone, our method can improve B1+ inhomogeneity by
approximately 50% in simulations and 30% in experimental
data.
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