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Related Experiment Videos

EIT using magnitude and phase in an extended frequency range

E Gersing1, M Osypka

  • 1Zentrum Physiologie und Pathophysiologie, Universität, Göttingen, Germany.

Physiological Measurement
|May 1, 1994
PubMed
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Electrical impedance tomography (EIT) imaging utilizes complex tissue impedance, including real and imaginary parts, for enhanced body cross-section visualization. This advanced EIT method offers improved contrast for imaging biological tissues, particularly the lungs.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Electrical Engineering

Background:

  • Electrical impedance is a key tissue property enabling body cross-section imaging.
  • Utilizing the complex tissue impedance (real and imaginary parts) provides comprehensive information beyond magnitude or phase alone.
  • Impedance measurements offer insights into tissue structure, extracellular space, and cell membranes.

Purpose of the Study:

  • To construct and evaluate an electrical impedance tomograph capable of utilizing various impedance components (real, imaginary, magnitude, phase) across an extended frequency range.
  • To enable both state-different and frequency-different imaging modalities.
  • To assess the potential of different impedance components for improved image contrast.

Main Methods:

Related Experiment Videos

  • Development of an electrical impedance tomograph with 16 electrodes.
  • Evaluation of impedance components (real, imaginary, magnitude, phase) using digital correlation.
  • Image reconstruction via a back-projection algorithm.
  • Implementation of frequency-different imaging using normalized imaginary part values or Im(Z)/Re(Z) quotients as time constants.
  • Testing with phantom models and initial in vivo human thorax measurements.

    • Main Results:

    • The developed EIT device can perform both state-different and frequency-different imaging.
    • Phantom studies demonstrated the ability to visualize electrode polarization phenomena.
    • In vivo human thorax imaging showed that phase-based EIT provides higher contrast for lung visualization compared to magnitude-based EIT.
    • Frequency-different imaging using normalized imaginary parts or Im(Z)/Re(Z) quotients proved effective.

    Conclusions:

    • The constructed electrical impedance tomograph effectively utilizes complex impedance information for advanced imaging.
    • Frequency-different EIT, particularly using phase or derived time constants, offers superior contrast for specific tissues like lungs.
    • The findings suggest significant potential for EIT in medical diagnostics and monitoring.