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Sinusoidal heating method to noninvasively measure tissue perfusion.

Jing Liu1, Yi-Xin Zhou, Zhong-shan Deng

  • 1Cryogenic Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China. jliu@cl.cryo.ac.cn

IEEE Transactions on Bio-Medical Engineering
|August 1, 2002
PubMed
Summary

A new sinusoidal heating method estimates tissue blood perfusion noninvasively. This improved technique uses a constant phase shift for accurate perfusion measurement, potentially leading to new clinical devices.

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Area of Science:

  • Biomedical Engineering
  • Biophysics

Background:

  • Noninvasive tissue blood perfusion measurement is a significant challenge in biomedical engineering.
  • Existing heating methods for perfusion estimation have limitations.

Purpose of the Study:

  • To propose an improved sinusoidal heating method for noninvasive tissue blood perfusion estimation.
  • To develop and validate an instrument based on the phase-shift principle for perfusion measurement.

Main Methods:

  • Theoretical and experimental investigation of the phase shift between sinusoidal heat flux and surface temperature response.
  • Construction of an instrument for generating regulated sinusoidal heat flux and measuring temperature and heat flux.
  • Validation of the method through experiments on human forearms and nonperfused materials.

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Main Results:

  • The phase shift approaches a constant value over time, enabling accurate perfusion estimation.
  • The developed instrument successfully generated high-quality sinusoidal heat flux.
  • Forearm perfusion was estimated and validated, showing promising results.

Conclusions:

  • The improved sinusoidal heating method, utilizing a constant phase shift, accurately estimates tissue blood perfusion.
  • The developed instrument is effective for noninvasive perfusion measurement.
  • This work paves the way for compact devices with significant clinical applications.