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Abstract #1536

A Method for Characterizing the Magnetic Field Response of a Gradient System

Signe Johanna Vannesj1, Maximilian Hberlin1, Lars Kasper1, Christoph Barmet1, Klaas Paul Pruessmann1

1Institute for Biomedical Engineering, ETH and University Zrich, Zrich, Switzerland

MRI relies on dynamic linear gradients for signal encoding, but the realization of given gradient time-courses is usually imperfect due to physical limitations. To characterize the magnetic field response to gradient-channel inputs the system is here treated as a linear time-invariant system that can be fully described by its impulse response functions. The field response was measured up to 3rd order in space with a dynamic field camera, consisting of 16 NMR probes. The measured impulse response functions allowed for accurate prediction of actual k-space trajectories and also showed predictable higher-order effects.