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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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