International Journal on Magnetic Particle Imaging IJMPI
Vol. 8 No. 1 Suppl 1 (2022): Int J Mag Part Imag
https://doi.org/10.18416/IJMPI.2022.2203076

Proceedings Articles

Multi-Channel Current Control System for Coupled Multi-Coil Arrays

Main Article Content

Fynn Foerger (UKE Hamburg), Jan-Philipp Scheel , Florian Thieben (Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany), Fabian Mohn (Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany), Tobias Knopp (Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany), Matthias Graeser (Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany Fraunhofer Research Institute for Individualized and Cell-based Medicine, Lübeck, Germany; Institute of Medical Engineering, University of Lübeck, Lübeck, Germany)

Copyright (c) 2022 Fynn Foerger, Jan-Philipp Scheel, Florian Thieben, Fabian Mohn, Tobias Knopp, Matthias Graeser

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

For imaging and force experiments in Magnetic Particle Imaging several field generating coils are required to produce sufficiently high and flexible magnetic fields. To minimize power consumption, coils with iron cores are the best choice for low and medium frequency ranges. Such coils have comparatively high reactance and often are inductively coupled. The trivial approach to ensure target currents is to provide each coil with a current controlled source resulting in high system complexity and high costs. This paper presents a circuit design to distribute bipolar target currents from a single unipolar source with high accuracy, reducing unwanted coil coupling by a feedback controller. Thus, the number of current sources can be significantly reduced. With a regenerative concept, reactive power is stored and can be reused, allowing efficient and fast current switching.

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