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Related Experiment Videos

What does inductance plethysmography really measure?

P Martinot-Lagarde1, R Sartene, M Mathieu

  • 1Laboratoire de Physique des Solides, Université Paris XI, Orsay, France.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1988
PubMed
Summary
This summary is machine-generated.

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Inductance plethysmography

Area of Science:

  • Physiology
  • Biomedical Engineering

Background:

  • Inductance plethysmography is used to measure cross-sectional area changes.
  • The accuracy of this method depends on the relationship between inductance and area.

Purpose of the Study:

  • To test the assumption that inductance plethysmography accurately measures cross-sectional area changes.
  • To investigate factors influencing the inductance-area relationship.

Main Methods:

  • Experimental and computed relationships between self-inductance (L) and area (A) were analyzed.
  • Coils with defined wavy patterns and a Respitrace belt were used on elliptical and rectangular configurations.
  • Computed tomography (CT) experiments were conducted for physiological validation.

Main Results:

Related Experiment Videos

  • The inductance-area (L-A) relationship is influenced by cross-sectional shape, ellipticity, and coil pattern.
  • A stable coil pattern allows for more accurate area change estimation in specific physiological scenarios.
  • Near-circular configurations (ellipticity 0.8-1) yielded less than 5% error in area change estimation.

Conclusions:

  • Inductance plethysmography's accuracy in measuring area changes is sensitive to configuration shape and coil pattern.
  • The method shows potential for accurate physiological measurements under specific, controlled conditions, particularly with near-circular shapes.