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Related Experiment Videos

Waveform generator for electrical impedance tomography (EIT) using linear interpolation with multiplying D/A

B Blad1, J Johannesson, G Johnsson

  • 1Radiation Physics Department, University Hospital, Lund, Sweden.

Journal of Medical Engineering & Technology
|September 1, 1994
PubMed
Summary
This summary is machine-generated.

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This study implements a multiplying digital-to-analogue converter as a programmable waveform generator for electrical impedance tomography (EIT) systems. The developed prototype achieves low total harmonic distortion, demonstrating its suitability for EIT applications.

Area of Science:

  • Electrical Engineering
  • Biomedical Engineering
  • Signal Processing

Background:

  • Electrical Impedance Tomography (EIT) systems require precise waveform generation.
  • Traditional waveform generation methods can be complex and costly.
  • Digital-to-analogue converters offer a flexible approach to waveform synthesis.

Purpose of the Study:

  • To implement a multiplying digital-to-analogue converter as a programmable waveform generator for EIT.
  • To evaluate the performance of the slope-plus-pedestal technique for waveform generation.
  • To assess the total harmonic distortion of the developed system.

Main Methods:

  • Implementation of a multiplying digital-to-analogue converter.
  • Utilizing the slope-plus-pedestal technique for waveform generation.

Related Experiment Videos

  • Design and construction of a wire-wrapped prototype system.
  • Measurement of frequency spectra to calculate total harmonic distortion.

    • Main Results:

    • The multiplying digital-to-analogue converter successfully functions as a programmable waveform generator.
    • The slope-plus-pedestal technique proved advantageous for this application.
    • Measured total harmonic distortion values ranged from 1.1% to 2.9%, varying with frequency.

    Conclusions:

    • The implemented multiplying digital-to-analogue converter is a viable component for EIT waveform generation.
    • The chosen digital technique provides acceptable distortion levels for EIT systems.
    • The prototype demonstrates the feasibility of this approach for EIT instrumentation.