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Abstract #0668

Concomitant field compensation using additional oscillating gradients in a double diffusion encoding imaging sequence

Julian Rauch1,2, Frederik B. Laun3, Theresa Palm3, Jan Martin3,4, Maxim Zaitsev5,6, Mark E. Ladd1,2,7, Peter Bachert1,2, and Tristan A. Kuder1
1Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Faculty of Physics and Astronomy, Heidelberg University, Heidelberg, Germany, 3Institute of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany, 4Division of Physical Chemistry, Lund University, Lund, Sweden, 5Medical Physics, Department of Radiology, Faculty of Medicine, Medical Center University of Freiburg, Freiburg, Germany, 6High Field Magnetic Resonance Center, Center for Medical Physics and Biomedical Engineering Medical University of Vienna, Vienna, Austria, 7Faculty of Medicine, Heidelberg University, Heidelberg, Germany

Concomitant or Maxwell fields cause intravoxel dephasing which can lead to strong image artifacts. In this study, we present a new method for concomitant field correction in double diffusion encoding sequences with single pairs of bipolar gradients on each axis. Additionally implemented oscillating gradients remove the dephasing without changing the desired image. Phase and magnitude images are analyzed with respect to concomitant field induced artifacts and the proposed correction method. We show that the compensation eliminates these artifacts without further consequences for image quality. The method also may be included in other imaging sequences to achieve concomitant field compensation.

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