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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