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Related Experiment Videos

Errors due to measuring voltage on current-carrying electrodes in electric current computed tomography.

K S Cheng1, S J Simske, D Isaacson

  • 1Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180.

IEEE Transactions on Bio-Medical Engineering
|January 1, 1990
PubMed
Summary

In electric current computed tomography (ECT), measuring voltage from all electrodes, even those applying current, improves target detection. This method enhances signal-to-noise ratio and accuracy compared to using only non-current-carrying electrodes.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Electrical Engineering

Background:

  • Electric current computed tomography (ECT) determines internal electrical conductivity using surface measurements.
  • Conventional ECT systems often use separate electrodes for current injection and voltage measurement.
  • Skin impedance can affect the accuracy of voltage measurements in ECT.

Purpose of the Study:

  • To investigate the optimal electrode configuration for maximizing sensitivity to internal resistivity changes in ECT.
  • To evaluate the impact of measuring voltage from current-carrying electrodes on image quality and target detectability.

Main Methods:

  • Theoretical analysis and experimental validation were employed.
  • Two datasets were collected: one with current and voltage applied to all electrodes, and another with current on a pair and voltage on others.

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  • A second dataset was computationally reconstructed from the first.

    • Main Results:

    • Voltage measurements from all electrodes, including current-carrying ones, are most sensitive to internal resistivity variations.
    • Reconstructed data from all-electrode measurements yielded a better signal-to-noise ratio for target detection.
    • Images generated using only non-current-carrying electrodes exhibited higher noise and reduced target localization accuracy.

    Conclusions:

    • For multi-electrode ECT systems, applying current and measuring voltage across all available electrodes is recommended.
    • This approach enhances the quality of reconstructed conductivity images and improves the detection of internal targets.