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Related Experiment Videos

The Doppler kinetics of microbubble echo contrast

K Q Schwarz1, X Chen, G P Bezante

  • 1University of Rochester, NY, USA. karlschwarz@echocardio.medicine.rochester.edu

Ultrasound in Medicine & Biology
|January 1, 1996
PubMed
Summary

This study reveals a two-phase response for saccharide-based microbubble contrast agents in dogs. Phase 2 kinetics are consistent across vascular regions, offering predictable contrast enhancement for diagnostic imaging.

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Area of Science:

  • Cardiovascular Imaging
  • Pharmacokinetics
  • Medical Ultrasound

Background:

  • Microbubble contrast agents enhance ultrasound imaging.
  • Understanding their kinetics is crucial for accurate interpretation.

Purpose of the Study:

  • To characterize the kinetics of a saccharide-based microbubble contrast agent.
  • To determine factors influencing contrast agent behavior in the heart and vasculature.

Main Methods:

  • Doppler intensity measured microbubble concentration in anesthetized dogs.
  • Kinetics analyzed considering dose, weight, and cardiac output.
  • Two-phase Doppler time-intensity curves were observed.

Main Results:

  • Phase 1 (first pass) kinetics depended on dose, cardiac output, and size.

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  • Phase 2 showed a prolonged, steady-state elevation in Doppler intensity.
  • Phase 2 kinetics were uniform across vascular regions and independent of cardiac output.

    • Conclusions:

    • Predictable formulas for Doppler enhancement magnitude and duration were developed.
    • Arterial contrast effects are primarily short-lived (seconds).
    • Phase 2 kinetics are consistent throughout the body, simplifying interpretation.