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A wide-band AC-coupled current source for electrical impedance tomography

R Bragós1, J Rosell, P Riu

  • 1Department d'Enginyeria Electrònica, Universitat Politècnica de Catalunya, Barcelona, Spain.

Physiological Measurement
|May 1, 1994
PubMed
Summary

This study presents a novel wide-bandwidth current source for electrical impedance tomography (EIT). The design overcomes common issues like mismatching and saturation, enhancing EIT system performance.

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Imaging

Background:

  • Electrical Impedance Tomography (EIT) requires stable and accurate current sources for imaging.
  • Discrete current source realizations often suffer from mismatching and temperature-induced problems.
  • Existing designs may face saturation issues when using DC-blocking capacitors.

Purpose of the Study:

  • To develop a wide-bandwidth current source specifically for EIT applications.
  • To address and overcome limitations of conventional current source designs.
  • To improve the reliability and accuracy of current injection in EIT systems.

Main Methods:

  • Utilized a current-feedback amplifier (AD844) for current-conveyor implementation.
  • Integrated an operational amplifier (op amp) feedback loop to enhance gain accuracy.

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  • Implemented DC feedback to prevent saturation and maintain low DC output voltage.

    • Main Results:

    • Achieved a wide-bandwidth current source using the AD844 amplifier.
    • Successfully mitigated mismatching and temperature-induced problems.
    • Resolved saturation issues associated with DC-blocking capacitors through DC feedback.
    • Demonstrated both inverting and non-inverting AC-coupled current source configurations.

    Conclusions:

    • The proposed current source design is suitable for EIT applications.
    • The design offers improved stability, accuracy, and reliability compared to discrete realizations.
    • The AC-coupled configurations provide versatile options for EIT system development.