title: The shape of electrical impedance spectroscopy (EIS) is altered in stroke patients.
abstract: The shape of the Power Spectral Density Function (PSD) of the Electrical Field Distribution exhibit abnormalities in the brain structure when comparing chronic stroke patients with healthy volunteers. We built a System that can deliver White Noise currents in the 0-25kHz band to any electrode pair. The System is also capable of measuring potentials with a high-dynamic range (24 Bits) from eight pairs of shielded electrodes placed on the subject's head and lying on an axial plane approximately 3 cm above inion. In the stroke patients, the asymmetry in the CSF distribution in the brain modifies the spatial components of the scalp potentials with respect to healthy volunteers.
authors.affiliation: A Martinos Center, Harvard Medical School, Charlestown, MA, USA.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Bonmassar
authors.forename: Sunao
authors.initials: S
authors.lastname: Iwaki