Abstract #0639
Characterizing electrical interactions of tissue with time-varying gradient fields: simulations and measurements
Stefano Mandija 1 , Astrid L.H.M.W. van Lier 1 , Axel Thielscher 2,3 , Andre Antunes 4 , Sebastiaan F.W. Neggers 5 , Peter R. Luijten 1 , and Cornelis A.T. van den Berg 1
1
Imaging Division, University Medical Center,
Utrecht, Netherlands,
2
Danish
Research Centre for Magnetic Resonance, Copenhagen,
Denmark,
3
Technical University of Denmark,
Kgs. Lyngby, Denmark,
4
Max
Planck Institute for Biological Cybernetics, Tbingen,
Germany,
5
Rudolf
Magnus Institute of Neuroscience, University Medical
Center, Utrecht, Netherlands
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.
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