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Characterizing Electrical Interactions of Tissue with Time-Varying Gradient Fields: Simulations and Measurements

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Antunes,  A
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Mandija, S., van Lier, A., Thielscher, A., Antunes, A., Neggers, S., Luijten, P., et al. (2014). Characterizing Electrical Interactions of Tissue with Time-Varying Gradient Fields: Simulations and Measurements. Poster presented at Joint Annual Meeting ISMRM-ESMRMB 2014, Milano, Italy.


Cite as: http://hdl.handle.net/21.11116/0000-0001-32EF-A
Abstract
At low frequency (Hz-kHz) the human body is electrically very heterogeneous. Adjacent biological structures constitute strong electrical impedance variations that affect current flow. In this work, we studied the effect of electrical impedance variations on the magnetic field distortions by inducing eddy currents caused by the readout gradient. We performed simulations and measurements on saline phantoms. We saw that, by measuring the induced Bz field, it is possible to derive information about the electric conduction and composition of media, e.g. interfaces and their orientation.