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Theoretical microbubble dynamics in a viscoelastic medium at capillary breaching thresholds.

Brandon Patterson1, Douglas L Miller, Eric Johnsen

  • 1Department of Mechanical Engineering, University of Michigan, 1231 Beal Avenue, Ann Arbor, Michigan 48109, USA. awesome@umich.edu

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Predicting ultrasound bioeffects requires understanding microbubble cavitation in tissues. This study models bubble dynamics, finding bioeffect thresholds exceed inertial cavitation thresholds, suggesting complex injury mechanisms.

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Area of Science:

  • Biophysics
  • Acoustics
  • Biomedical Engineering

Background:

  • Predicting bioeffects in ultrasound procedures necessitates understanding cavitation microbubble dynamics in viscoelastic media.
  • Contrast-enhanced ultrasound uses microbubbles, and their behavior under pressure waves is crucial for safety.

Purpose of the Study:

  • To model and calculate cavitation microbubble dynamics in viscoelastic tissue under ultrasound exposure.
  • To determine bioeffect thresholds for contrast-enhanced ultrasound and compare them to inertial cavitation thresholds.

Main Methods:

  • Utilized measured ultrasound pulse pressure waveforms (1.5-7.5 MHz) from rat kidney experiments.
  • Developed a numerical model for cavitation based on the Keller-Miksis equation with a Kelvin-Voigt constitutive relation.
  • Calculated bubble dynamics, maximum radius, and temperature at bioeffect thresholds.

Main Results:

  • Bubble dynamics were computed corresponding to experimentally determined capillary breaching thresholds.
  • Bioeffect thresholds were found to be higher than previously determined inertial cavitation thresholds.
  • Results demonstrated dependency on ultrasound frequency, gas content, and tissue elastic properties.

Conclusions:

  • The study suggests a more complex dosimetry is needed for capillary injury in tissue during ultrasound procedures.
  • Bioeffect thresholds exceeding inertial cavitation thresholds highlight the need for advanced modeling.
  • Understanding microbubble behavior is key for safe and effective diagnostic and therapeutic ultrasound applications.