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Quantitation of echo-contrast effects.

S M Powsner1, M W Keller, J Saniie

  • 1Section of Cardiology, University of Chicago, Illinois 60637.

American Journal of Physiologic Imaging
|January 1, 1986
PubMed
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Researchers explored the relationship between microbubble concentration and ultrasound signals for accurate tissue perfusion measurement. They found a critical concentration where signals decrease, enabling prediction of microbubble size for quantitative perfusion analysis.

Area of Science:

  • Medical Imaging
  • Acoustics
  • Biophysics

Background:

  • Quantitative tissue perfusion measurement is crucial for clinical diagnostics.
  • Echocardiographic contrast agents, specifically sonicated microbubbles, offer potential for improved perfusion assessment.
  • Understanding the acoustic properties of these agents is key to accurate quantification.

Purpose of the Study:

  • To investigate the quantitative relationship between sonicated microbubble concentration and reflected ultrasound signal intensity.
  • To determine the acoustic properties of sonicated microbubbles and their impact on signal generation.
  • To experimentally verify the acoustic model and its predictive capabilities for microbubble size.

Main Methods:

  • Characterization of basic acoustic properties of sonicated microbubbles.

Related Experiment Videos

  • Experimental verification of the relationship between microbubble concentration and ultrasound signal.
  • In vitro testing of acoustic analysis to confirm critical concentration limits.
  • Comparison of predicted microbubble size with published values.

    • Main Results:

    • Sonicated microbubbles exhibit acoustic properties similar to random Rayleighian scatters.
    • Ultrasound signal strength is primarily dependent on gas compressibility and bubble diameter (sixth power dependence).
    • A critical microbubble concentration was identified where the ultrasound signal begins to decrease.
    • In vitro tests confirmed the acoustic analysis, predicting microbubble size within a factor of two of published data.

    Conclusions:

    • The acoustic properties of sonicated microbubbles can be characterized to enable quantitative perfusion measurements.
    • A critical concentration limit exists, predictable by bubble size, which is vital for accurate signal interpretation.
    • This acoustic analysis and experimental validation pave the way for reliable quantitative regional perfusion assessment using sonicated contrast agents.