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A real-time electrical impedance tomograph

P M Edic1, G J Saulnier, J C Newell

  • 1Department of Electrical, Computer and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.

IEEE Transactions on Bio-Medical Engineering
|September 1, 1995
PubMed
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Electrical Impedance Tomography (EIT) images tissue electrical properties using applied currents and measured voltages. This real-time system presents conductivity and permittivity distributions, visualizing physiological changes like respiration and cardiac activity.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Electrical Engineering

Background:

  • Electrical Impedance Tomography (EIT) is a non-invasive imaging technique.
  • It visualizes internal electrical properties of biological tissues.
  • Current EIT systems face challenges in real-time processing and display.

Purpose of the Study:

  • To describe the reconstruction algorithm, image display, and hardware of a real-time EIT system.
  • To present the performance of the Real-Time Imaging System (RTIS).
  • To demonstrate the system's capability in visualizing physiological processes.

Main Methods:

  • Developed a modified Newton's One Step Error Reconstructor (NOSER) algorithm for faster computation.
  • Implemented image display algorithms on a coprocessor board within a personal computer.

Related Experiment Videos

  • Utilized continuous and triggered data acquisition modes for capturing dynamic physiological data.

    • Main Results:

    • The RTIS successfully reconstructed conductivity and permittivity distributions.
    • Real-time imaging of admittivity changes in the human thorax due to respiration and cardiac cycle was achieved.
    • Triggered data acquisition synchronized with an electrocardiogram demonstrated system's capability for precise physiological event capture.

    Conclusions:

    • The described real-time EIT system offers efficient image reconstruction and display.
    • The system effectively visualizes dynamic physiological processes in human subjects.
    • The RTIS provides a valuable tool for non-invasive monitoring and imaging in biomedical applications.