Abstract #3412

Signal gain by reduction of the concomitant phase in double diffusion encoding by means of added oscillating gradients

Julian Rauch^1,2, Frederik B. Laun³, Dominik Ludwig¹, Maxim Zaitsev⁴, Mark E. Ladd^1,2,5, Peter Bachert^1,2, and Tristan A. Kuder^1,2

¹Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ²Faculty of Physics and Astronomy, Heidelberg University, Heidelberg, Germany, ³University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany, ⁴Medical Physics, Department of Radiology, Faculty of Medicine, Medical Center University of Freiburg, Freiburg, Germany, ⁵Faculty of Medicine, Heidelberg University, Heidelberg, Germany

Synopsis

Keywords: Artifacts, ArtifactsIntravoxel dephasing generated by Maxwell or concomitant fields can cause image artifacts like signal voids or falsify the quantification. In this study, an optimization scheme to reduce concomitant field effects in diffusion sequences with single pairs of bipolar gradients on each axis is presented. Oscillating gradients are added onto the original gradient pulses with the aim of reducing the concomitant phase without significant changes in the sequence properties. The proposed method is evaluated in both measurements and simulations, and gives rise to a positive effect on the signal for arbitrary diffusion wave vector pairs.

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