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Impedance imaging using induced currents

I L Freeston1, R C Tozer

  • 1Department of Electronic and Electrical Engineering, University of Sheffield, UK.

Physiological Measurement
|August 1, 1995
PubMed
Summary
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Electrical impedance tomography (EIT) visualizes conductivity distributions using induced currents. This study demonstrates separating conductivity and permittivity images and using non-contact electrodes for advanced imaging.

Area of Science:

  • Electrical Engineering
  • Biomedical Imaging
  • Applied Physics

Background:

  • Electrical Impedance Tomography (EIT) is an imaging technique that reconstructs internal conductivity distributions from peripheral measurements.
  • Traditional EIT systems often require direct electrical contact, limiting applications.
  • Separating conductivity and permittivity is crucial for accurate material characterization.

Purpose of the Study:

  • To describe the key features of an EIT system utilizing induced currents.
  • To demonstrate the capability of separating conductivity and permittivity images.
  • To explore the use of non-contact electrodes in EIT.

Main Methods:

  • Development of an EIT system employing induced currents.
  • Application of a sensitivity matrix-based algorithm for image reconstruction.

Related Experiment Videos

  • Utilizing measurements of complex peripheral voltage to differentiate conductivity and permittivity.
  • Employing capacitively coupled electrodes for non-contact measurements.

    • Main Results:

    • Successful generation of conductivity distribution images in a two-dimensional phantom.
    • Demonstration of the separation of conductivity and permittivity images.
    • Formation of unreferenced permittivity images.
    • Validation of capacitively coupled electrodes for EIT without direct electrical contact.

    Conclusions:

    • The described EIT system effectively visualizes conductivity distributions.
    • The method allows for the separation of conductivity and permittivity, enhancing imaging capabilities.
    • Capacitive coupling offers a viable approach for non-contact EIT, expanding its potential applications.