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Related Experiment Videos

Common-mode feedback in electrical impedance tomography.

J Rosell1, P Riu

  • 1Departament d'Enginyeria Electrònica, Barcelona, Spain.

Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Fur Medizinische Physik and the European Federation of Organisations for Medical Physics
|January 1, 1992
PubMed
Summary
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Common-mode feedback (CMFB) effectively reduces measurement errors caused by common-mode voltage (CMV) in electrical impedance tomography (EIT). This technique improves measurement accuracy by up to 40 dB at frequencies up to 10 kHz.

Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Imaging

Background:

  • Electrical impedance tomography (EIT) requires high accuracy for image reconstruction.
  • Common-mode voltage (CMV) introduces measurement errors in EIT systems.
  • Differential amplifiers with high common-mode rejection ratio (CMRR) are typically used but have limitations.

Purpose of the Study:

  • To investigate the effectiveness of common-mode feedback (CMFB) in mitigating CMV errors in EIT.
  • To analyze the stability of the CMFB loop in a broadband system.
  • To quantify the improvement in measurement accuracy using CMFB.

Main Methods:

  • Simulations were performed to model the CMFB system.
  • Experimental validation was conducted to verify simulation results.

Related Experiment Videos

  • The stability of the feedback loop was analyzed for broadband frequencies.

    • Main Results:

    • CMFB significantly reduces errors caused by CMV.
    • An improvement of up to 40 dB in measurements was achieved.
    • The CMFB loop demonstrated stability in broadband systems up to 10 kHz.

    Conclusions:

    • CMFB is a viable alternative to high CMRR amplifiers for reducing CMV errors in EIT.
    • The study confirms the practical utility of CMFB for enhancing EIT measurement accuracy.
    • CMFB offers a robust solution for improving EIT imaging quality.