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Abstract #0086

Uniform Spatiotemporal Excitation Despite Extreme B0 Inhomogeneity Using Dynamically-Driven Multi-Coil Arrays

Mohan Lal Jayatilake1, Christoph Juchem 2, Michael Mullen3, Lance DelaBarre3, Gregor Adriany4, Robin de Graaf5, and Michael Garwood3

1Center for Magnetic Resonance Research, University of Minnesota, Minnesota, MN, United States, 2Departments of Biomedical Engineering and Radiology, Columbia University in the City of New York, NY, United States, 3Center for Magnetic Resonance Research, University of Minnesota, MN, United States, 4Center for Magnetic Resonance Research, University of Minnesota, Minnesota, United States, 5Department of Radiology and Biomedical Imaging, Yale University School of Medicine, NY, United States

Developments of new imaging strategies that tolerate extreme B0 inhomogeneity can reduce size and cost of MRI magnets; but with conventional MRI methods, a highly uniform B0 is still required to obtain high quality images. Previously we demonstrated spatiotemporal excitation of spins in the presence of large B0 inhomogeneity when driving a multi-coil array with the dynamic multi-coil technique known as DYNAMITE. In that work, tolerance to B0 inhomogeneity began to degrade when the frequency variation exceeded +/-40 kHz, which is insufficient for imaging with a small magnet. Here we present a technique to substantially extend the range of B0 inhomogeneity tolerance of this approach when using RF pulses based on the principle of offset-independent adiabaticity (OIA).

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