Posts Tagged: bioimpedance

  • Model of Impedance Changes in Unmyelinated Nerve Fibres

    Electrical impedance tomography produces cross-sectional images of the compound action potential in peripheral nerve; it has potential to provide images of active fascicles in autonomic nerves. It could be used in electroceuticals for selective stimulation of nerve fascicles and so avoid off-target effects.
    For this, the EIT parameters must be optimised. This has been aided by development of accurate FEM models of unmyelinated nerve fibres bi-directionally coupled with the external space. The models agreed with experiments and could serve as a basis for optimising EIT imaging and consequent selective stimulation.

  • Skull Modeling Effects in Conductivity Estimates Using Parametric Electrical Impedance Tomography

    Skull Modeling Effects in Conductivity Estimates Using Parametric Electrical Impedance Tomography

    Modeling in electroencephalography (EEG) and transcranial electrical stimulation (TES) requires the precise geometry and conductivity specifications of the head. Bounded Electrical Impedance Tomography (EIT) offers a portable and affordable method for non-invasive determination of tissue conductivities, because it can be implemented within the same EEG system and electrodes. We demonstrate this method with a high density EEG system and show how the variability of previously reported estimates could be due to the different sophistication of head models employed.

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