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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