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Plethysmographic arterial waveform strain discrimination by Fisher's method.

John C Kucewicz1, Lingyun Huang, Kirk W Beach

  • 1Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, and Department of Bioengineering, University of Washington, Seattle, 98105-6698, USA. kucewicz@u.washington.edu

Ultrasound in Medicine & Biology
|June 29, 2004
PubMed
Summary

This study introduces a novel Doppler strain-imaging technique to measure tissue blood volume changes, analogous to conventional plethysmography. The method successfully differentiates normal and abnormal tissue perfusion using strain waveform analysis.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Physiology

Background:

  • Plethysmography has long measured gross tissue blood volume changes over the cardiac cycle.
  • Tissue expansion and recoil during the cardiac cycle reflect blood flow dynamics.
  • Identifying perfusion abnormalities from plethysmographic waveforms is clinically significant.

Purpose of the Study:

  • To develop a Doppler strain-imaging technique for local tissue pulsatile expansion measurement.
  • To create a method analogous to conventional plethysmography for tissue volume change assessment.
  • To evaluate the technique's ability to differentiate normal and abnormal perfusion.

Main Methods:

  • Development of a Doppler strain-imaging system.
  • Construction of a phantom generating small, plethysmographic-style strains (<0.1%).

Related Experiment Videos

  • Application of Fisher's discriminant analysis on Fourier components of normalized strain waveforms.

    • Main Results:

    • The Doppler strain-imaging technique successfully generated plethysmographic-style strain signals.
    • Normal and abnormal strain waveforms were differentiated with high sensitivity.
    • Fourier components of normalized strain waveforms proved effective for classification.

    Conclusions:

    • Doppler strain-imaging offers a promising approach for assessing local tissue hemodynamics.
    • This technique can potentially identify abnormal tissue perfusion.
    • The method provides a localized, non-invasive alternative to conventional plethysmography.