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This study reveals that ultrasound contrast agent microbubble shell viscosity is independent of bubble size, contrary to prior research. Methodological inaccuracies in bubble spectroscopy were identified as the cause of previous size-dependent findings.

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Materials Science

Background:

  • Shell rheology of ultrasound contrast agent microbubbles is crucial for predicting bioeffects.
  • Previous studies reported size-dependent shell viscosity, lacking clear physical explanations.

Purpose of the Study:

  • To investigate the dependency of shell viscosity on microbubble radius.
  • To identify the cause of discrepancies in previous shell viscosity measurements.

Main Methods:

  • Utilized ultra-high-speed microscopy, optical trapping, and fluorescence imaging.
  • Recorded individual microbubble responses to ultrasound excitation across various sizes.
  • Employed an advanced bubble dynamics model to infer shell viscosity from radial time evolution.

Main Results:

  • Shell viscosity exhibited significant variability (order of magnitude) but no dependency on bubble size.
  • Identified bubble spectroscopy as sensitive to methodological inaccuracies, leading to artifactual size-dependent trends.
  • Demonstrated that incorrect bubble sizing can also introduce unphysical trends in shell viscosity.

Conclusions:

  • The previously reported size-dependency of shell viscosity is an artifact of measurement biases.
  • Accurate bubble sizing and refined methodologies are critical for reliable shell rheology characterization.
  • This work clarifies microbubble shell behavior, impacting ultrasound contrast agent applications.