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Related Experiment Videos

A high-precision voltage source for EIT.

Gary J Saulnier1, Alexander S Ross, Ning Liu

  • 1Department of Electrical, Computer and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA. saulng@rpi.edu

Physiological Measurement
|April 26, 2006
PubMed
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This study presents a novel voltage source for applied-voltage Electrical Impedance Tomography (EIT) systems. The developed calibration method ensures accurate conductivity measurements by minimizing system non-idealities.

Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Imaging

Background:

  • Electrical Impedance Tomography (EIT) reconstructs internal conductivity using surface electrode measurements.
  • EIT systems typically apply currents and measure voltages, or vice versa.
  • Existing methods for applied-voltage EIT require precise voltage source control and calibration.

Purpose of the Study:

  • To introduce a novel voltage source for applied-voltage EIT.
  • To present a calibration circuit and algorithm for precise EIT measurements.
  • To minimize errors caused by stray impedance and component variations in EIT systems.

Main Methods:

  • Development of a voltage source capable of measuring both applied voltage and current.
  • Design of a calibration circuit for standardizing voltage sources.

Related Experiment Videos

  • Implementation of a calibration algorithm to correct for system non-idealities.
  • Utilizing PSpice simulations to validate the proposed circuits and algorithm.

    • Main Results:

    • The proposed calibration circuit and algorithm effectively calibrate voltage sources to a common standard.
    • The calibration method significantly reduces the impact of stray shunt impedance and component variability.
    • Simulation data confirms the effectiveness of the developed EIT voltage source and calibration technique.

    Conclusions:

    • The novel voltage source and calibration method enhance the accuracy and reliability of applied-voltage EIT.
    • This approach offers a practical solution for improving EIT system performance.
    • Accurate calibration is crucial for minimizing errors in EIT-based conductivity imaging.