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Measuring lung resistivity using electrical impedance tomography.

E J Woo1, P Hua, J G Webster

  • 1Department of Electrical and Computer Engineering, University of Wisconsin, Madison 53706.

IEEE Transactions on Bio-Medical Engineering
|July 1, 1992
PubMed
Summary
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Electrical impedance tomography (EIT) offers a novel method for monitoring lung resistivity to detect apnea and edema. This simplified EIT approach shows feasibility in simulations and human experiments for improved respiratory monitoring.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Respiratory Physiology

Background:

  • Apnea and edema detection currently rely on methods that may be limited in accuracy.
  • Monitoring internal lung resistivity changes offers a potential avenue for more reliable respiratory assessment.

Purpose of the Study:

  • To investigate the use of electrical impedance tomography (EIT) for measuring lung resistivity.
  • To assess the feasibility of EIT for detecting and monitoring apnea and edema.

Main Methods:

  • Utilized EIT imaging by injecting currents and measuring boundary voltages to reconstruct resistivity distributions.
  • Developed and tested a simplified, faster version of the impedance imaging method.
  • Validated the approach through computer simulations and human experiments.

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Main Results:

  • A simplified EIT method demonstrated feasibility for detecting and monitoring apnea and edema.
  • Internal lung resistivity monitoring shows potential for greater reliability than current impedance methods.

Conclusions:

  • The developed EIT technique is a promising tool for lung resistivity measurement in apnea and edema.
  • Further research is needed to compare EIT's performance against conventional methods, especially concerning motion artifacts.