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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