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Abstract #3909

Implementation of a Gradient Pre-emphasis Based on the Gradient Impulse Response Function

Manuel Stich1, Tobias Wech1, Anne Slawig1, Ralf Ringler2, Andrew Dewdney 3, Andreas Greiser3, Gudrun Ruyters3, Thorsten Bley1, and Herbert Köstler1

1Department of Diagnostic and Interventional Radiology, University of Würzburg, Würzburg, Germany, 2X-Ray & Molecular Imaging Lab, Technical University Amberg-Weiden, Weiden, Germany, 3Siemens, Erlangen, Germany

The gradient impulse response function (GIRF) completely characterizes the gradient system as a linear and time-invariant (LTI) system, and has recently been used to correct for distorted k-space trajectories in image reconstruction. We now report on the implementation of a GIRF-based pre-emphasis, which is resulting in gradient waveforms already matching the desired k-space trajectory and rendering post-corrections obsolete. The method was successfully tested in a sequence with modulated phase-encoding gradients, as for example used in Wave-CAIPI.

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