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Updated: May 27, 2026
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Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release
Published on: June 12, 2021
Combined optical and acoustical detection of single microbubble dynamics
Jeroen Sijl1, Hendrik J Vos, Timo Rozendal
1Physics of Fluids Group and MIRA Institute of Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
The Journal of the Acoustical Society of America
|November 18, 2011
Summary
Understanding microbubble behavior under ultrasound is key for medical imaging and drug delivery. This study shows that sound emission directly predicts microbubble motion, and vice versa, enabling precise control.
Area of Science:
- Biomedical Engineering
- Acoustics
- Materials Science
Background:
- Microbubbles are crucial for medical ultrasound imaging, targeted molecular imaging, and ultrasound-mediated drug delivery.
- A detailed understanding of single microbubble responses to ultrasound is fundamental for optimizing these applications.
- Current methods may lack the precision to fully characterize microbubble dynamics at the nanoscale.
Purpose of the Study:
- To investigate the ultrasound-induced radial dynamics of single microbubbles.
- To correlate the acoustic emissions with the physical motion of microbubbles.
- To establish a predictive relationship between optical and acoustic measurements of microbubble behavior.
Main Methods:
- Isolation of single microbubbles for controlled experimentation.
- Recording of ultrasound-induced radial dynamics using an ultra-high-speed camera (up to 25 million frames per second).
- Simultaneous recording of sound emission with a calibrated single-element transducer.
Main Results:
- The study demonstrates a direct predictive relationship between optically recorded radial dynamics and simultaneously emitted sound.
- Conversely, nanometer-scale radial dynamics can be accurately predicted from far-field acoustic responses.
- High-speed imaging and acoustic detection provide a comprehensive characterization of microbubble behavior.
Conclusions:
- The findings establish a strong correlation between microbubble motion and acoustic emission.
- This bidirectional predictability allows for enhanced monitoring and control of microbubbles in ultrasound applications.
- The study provides a foundation for improved ultrasound imaging, targeted delivery, and therapeutic interventions using microbubbles.
