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Abstract #0442

Echo Planar Imaging of the Human Brain with 100 mT/m Gradients

Franciszek Hennel1, Bertram Wilm1, Manuela B. Roesler1, Benjamin Dietrich1, Markus Weiger1, and Klaas P. Pruessmann1

1Institute for Biomedical Engineering, ETH Zurich and University of Zurich, Zurich, Switzerland

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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