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Abstract #1109

Mapping of magnetic fields due to current injection in the human brain using MREIT: First measurements.

Aditya Kumar Kasinadhuni1, Munish Chauhan2, Christopher Anderson1, Michael Schär3, Aprinda Indahlastari2, Paul Carney1, Rosalind Sadleir2, and Thomas Mareci1

1University of Florida, Gainesville, FL, United States, 2Arizona State University, Tempe, AZ, United States, 3Johns Hopkins University, Baltimore, MD, United States

Magnetic resonance electrical impedance tomography (MREIT) relies on phase changes resulting from electric-current-induced magnetic fields in the direction of static magnetic field of an MRI scanner. Therefore MREIT can be employed to estimate conductivity/current density within the object being imaged. Characterizing current density in the brain is vital to improving our understanding of neuromodulation techniques like transcranial direct current stimulation (tDCS). In this study, to our knowledge, we performed the first MREIT brain scans of healthy human volunteers to localize the current-induced magnetic field generated by tDCS-like currents. These measurements allow estimation of current density in the human brain.

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