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Related Experiment Videos

Impedance analyser module for EIT and spectroscopy using undersampling.

T Dudykevych1, E Gersing, F Thiel

  • 1Department of Anaesthesiological Research, Centre of Anaesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Germany. tdudyke@gwdg.de

Physiological Measurement
|March 10, 2001
PubMed
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We developed a digital bioimpedance analyzer module for electrical impedance tomography (EIT) and spectroscopy. This high-precision device operates up to 10 MHz, reducing data sampling and costs.

Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Instrumentation

Background:

  • Bioimpedance analysis is crucial for applications like electrical impedance tomography (EIT) and bioimpedance spectroscopy.
  • Existing bioimpedance analyzers often face limitations in frequency range, data processing, and cost-effectiveness.
  • A need exists for high-precision, wide-band bioimpedance measurement tools suitable for advanced medical applications.

Purpose of the Study:

  • To present the concept, design, and testing of a novel DSP-based bioimpedance analyzer module.
  • To achieve high precision and wide-band performance (up to 10 MHz) for bioimpedance applications.
  • To reduce data sampling rates, power consumption, and analog-to-digital converter (ADC) costs.

Main Methods:

Related Experiment Videos

  • Implementation of a digital concept with integrated signal conditioning for voltage and current.
  • Early signal digitization followed by digital signal processing for impedance/admittance calculation.
  • Utilized direct conversion at low frequencies and undersampling techniques at high frequencies.

    • Main Results:

    • The bioimpedance analyzer module demonstrates a wide frequency range up to 10 MHz.
    • Achieved high accuracy: better than 0.012% for impedance magnitude and 0.02 degrees for phase.
    • Validation confirmed accurate measurements against a standard tissue model.

    Conclusions:

    • The developed DSP-based module offers a high-performance, high-precision solution for bioimpedance analysis.
    • The digital approach, including undersampling, significantly reduces data handling and system costs.
    • This module is well-suited for advanced EIT and bioimpedance spectroscopy applications.