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Related Experiment Videos

Current injection electrodes for electrical impedance tomography.

S Armstrong1, D Jennings

  • 1School of Engineering, Cardiff University, Cardiff CF24 37F, UK.

Physiological Measurement
|September 24, 2004
PubMed
Summary
This summary is machine-generated.

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Current conveyors offer precise current generation for electrical impedance tomography (EIT) systems. A novel bipolar circuit design achieves over 12 mA output current with minimal phase shift, enhancing EIT accuracy.

Area of Science:

  • Electronics
  • Biomedical Engineering
  • Electrical Engineering

Background:

  • Accurate current generation is crucial for electrical impedance tomography (EIT) systems.
  • Current conveyors are potential components for EIT current injection electrodes.

Purpose of the Study:

  • To investigate circuit configurations for precise current generation in EIT.
  • To design and simulate a current conveyor-based circuit for EIT applications.

Main Methods:

  • Simulated various circuit configurations for EIT current injection.
  • Designed and analyzed a bipolar (floating source) circuit using current conveyors.
  • Evaluated performance over a range of body impedances and frequencies.

Main Results:

Related Experiment Videos

  • The designed bipolar current conveyor circuit achieved >12 mA output current without saturation.
  • Simulations confirmed performance above 1 MHz.
  • Output phase shift was <0.15° up to 250 kHz and <0.6° up to 1 MHz.

Conclusions:

  • A bipolar current conveyor circuit configuration is suitable for EIT systems.
  • The proposed design meets EIT specifications for accurate current injection.
  • This approach enhances the precision of current generation in EIT devices.