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DSP-based current source for electrical impedance tomography.

Gary J Saulnier1, Ahmed Abdelwahab1, Omid Rajabi Shishvan1

  • 1Electrical and Computer Engineering, University at Albany, State University of New York, Albany, NY, United States of America.

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Summary
This summary is machine-generated.

This study introduces a simple, adjustment-free analog current source for Electrical Impedance Tomography (EIT) systems. The novel design achieves high output impedance, improving EIT imaging performance.

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Area of Science:

  • Electrical Engineering
  • Biomedical Engineering
  • Signal Processing

Background:

  • Electrical Impedance Tomography (EIT) systems, especially parallel or multiple-source designs, necessitate current sources with exceptionally high output impedance.
  • Conventional high-output impedance current sources often rely on complex analog circuitry requiring manual or electronic adjustments, increasing system complexity and cost.

Purpose of the Study:

  • To develop a current source with simple, adjustment-free analog electronics that maintains high effective output impedance.
  • To overcome limitations of existing current sources in EIT systems, particularly in the presence of significant stray output impedance.

Main Methods:

  • An adaptive algorithm adjusts the excitation provided to a voltage-to-current converter to compensate for current loss due to finite output and stray impedances.
  • The algorithm utilizes measured voltage and previously determined output and stray impedance values to calculate the necessary current adjustment.

Main Results:

  • Experimental results demonstrate the effectiveness of the adaptive current source up to 1 MHz.
  • Measured output impedance, with and without adaptive compensation, confirms improved performance under resistive and complex loads.

Conclusions:

  • The developed current source offers low analog complexity and operates effectively over a wide frequency range.
  • It successfully compensates for substantial stray shunt impedance, enabling the implementation of enhanced parallel or serial EIT systems.