First results obtained with Echo Planar Imaging using a gradient insert producing 100 mT/m with 1200 T/m/s slew rate are reported. High-resolution single-shot images of human head with a very low level of distortion and blur were obtained without the need of high parallel acceleration. However, at these extreme gradient strengths, high-order fields produced by eddy-currents require special measures to avoid spatially modulated “Nyquist ghosts”. Our strategy consisted of multi-position monitoring of eddy-current fields, fitting these results with 5th-order spherical harmonics, and including this model in the signal encoding matrix inverted during reconstruction.
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