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Related Experiment Video

Updated: May 12, 2026

Imaging and Quantification of the Area of Fast-Moving Microbubbles Using a High-Speed Camera and Image Analysis
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Published on: September 5, 2020

Microbubble cavitation imaging.

Francois Vignon1, William T Shi, Jeffry E Powers

  • 1Ultrasound, Photonics, and Bioinformatics, Philips Research USA, Briarcliff Manor, NY, USA. fancois.vignon@philips.com

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|April 4, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel 2-D cavitation imager for ultrasound therapy, enabling spatial mapping of microbubble cavitation states. This advancement is crucial for safe and effective treatments like sonothrombolysis for stroke.

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Area of Science:

  • Medical Imaging
  • Acoustics
  • Biomedical Engineering

Background:

  • Ultrasound cavitation of microbubbles shows therapeutic promise, particularly for sonothrombolysis in acute ischemic stroke.
  • Accurate assessment of cavitation states (moderate oscillations, stable, inertial) and activity is vital for treatment safety, efficacy, and reproducibility.
  • Current acoustic passive cavitation detectors lack spatial resolution, limiting precise localization of cavitation activity.

Purpose of the Study:

  • To present a prototype 2-D cavitation imager for visualizing dominant cavitation states and activity levels within a region of interest.
  • To enable spatial assessment of microbubble behavior during ultrasound-mediated therapies.
  • To improve the safety and efficacy of ultrasound therapies by providing real-time cavitation mapping.

Main Methods:

  • Development of a 2-D cavitation imager using a modified commercial ultrasound scanner and sector imaging probe.
  • Spectral analysis of acoustic signals radiated by cavitating microbubbles to identify cavitation states: ultraharmonics for stable cavitation, elevated noise bands for inertial cavitation.
  • Characterization of system performance, including lateral resolution (1.5 mm at 3 cm depth), axial resolution (3 cm), and maximum frame rate (2 Hz).

Main Results:

  • The prototype successfully produced images of dominant cavitation states and activity levels.
  • Demonstrated the system's capability to assess and map the relative importance of different cavitation states of microbubble contrast agents.
  • Presented in vitro and in vivo results showing cavitation states and their changes with acoustic amplitude in various organs.

Conclusions:

  • The developed 2-D cavitation imager provides crucial spatial information on microbubble cavitation states, overcoming limitations of previous methods.
  • This technology has the potential to enhance the safety, efficacy, and reproducibility of ultrasound-mediated therapies, including sonothrombolysis.
  • The system's performance in both phantom and animal studies validates its utility for real-time cavitation assessment in therapeutic ultrasound applications.