actual current densities applied to the brain in neuromodulation therapies. MREIT can be used to determine actual current densities delivered to the brain by measuring Bz. Here we present Bz distributions resulting from trans-temporal current injection obtained from MREIT imaging during 10 Hz TACS in a healthy human subject. Comparisons of MREIT results to MRI-derived computational models suggested that actual contact areas between electrodes and scalp may be smaller than electrode surface areas, and in-vivo tissue conductivity values, particularly skin and skull, may be different than assumed.
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