Abstract #0668

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

Julian Rauch^1,2, Frederik B. Laun³, Theresa Palm³, Jan Martin^3,4, Maxim Zaitsev^5,6, Mark E. Ladd^1,2,7, Peter Bachert^1,2, 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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