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Updated: Jun 1, 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
Review of shell models for contrast agent microbubbles.
Alexander A Doinikov1, Ayache Bouakaz
1INSERM U930 CNRS ERL3106, Université François Rabelais, CHU Bretonneau, Tours, France.
Summary
This review examines ultrasound contrast agent shell models, highlighting limitations of linear models. Nonlinear models show promise for accurately simulating bubble behavior in medical diagnostics and therapy.
Area of Science:
- Biomedical Engineering
- Acoustics
- Materials Science
Background:
- Ultrasound contrast agents (microbubbles) enhance medical imaging and aid therapy.
- The encapsulating shell dictates agent properties, making shell modeling crucial.
- Existing models often fail to capture complex shell behaviors observed experimentally.
Purpose of the Study:
- To review and compare existing models for encapsulated bubble radial motion.
- To evaluate shell model capabilities against recent experimental findings.
- To identify limitations and trends in contrast agent modeling.
Main Methods:
- Literature review of radial motion models for encapsulated bubbles.
- Comparative analysis of different shell models.
- Evaluation of models based on experimental data (compression-only behavior, radius dependence).
Main Results:
- Early models using linear elastic/viscous laws are insufficient.
- Recent experimental data reveal complex rheological shell properties.
- Nonlinear models can reproduce compression-only behavior.
- Radius dependence of shell parameters remains an unsolved challenge.
Conclusions:
- Advanced, nonlinear shell models are necessary for accurate contrast agent simulation.
- Further research is needed to address the radius dependence of shell material properties.
- Improved modeling will enhance ultrasound diagnostics and therapeutic applications.
