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Excitation threshold for subharmonic generation from contrast microbubbles.

Amit Katiyar1, Kausik Sarkar

  • 1Department of Mechanical Engineering, University of Delaware, 130 Academy Street, Newark, Delaware 19701, USA.

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|November 18, 2011
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The study reveals that the optimal ultrasound frequency for microbubble subharmonic generation varies. The encapsulation

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Area of Science:

  • Acoustics
  • Biomedical Engineering
  • Materials Science

Background:

  • Microbubbles are crucial as ultrasound contrast agents.
  • Subharmonic generation is a key phenomenon for contrast-enhanced ultrasound imaging.
  • Understanding microbubble behavior under acoustic excitation is essential for optimizing imaging.

Purpose of the Study:

  • To investigate six models of microbubble contrast agents.
  • To determine the excitation threshold for subharmonic generation across different models.
  • To analyze the influence of interfacial rheology on microbubble response.

Main Methods:

  • Applied six microbubble models to a commercial contrast agent.
  • Determined model parameters using experimentally measured ultrasound attenuation.
  • Transformed models into a common interfacial rheological form.

Main Results:

  • The minimum threshold for subharmonic generation occurs over a range of frequencies (resonance to twice the resonance frequency), not solely at twice the resonance frequency.
  • The quantitative threshold variation depends on the specific model and bubble radius.
  • An upper limit on effective surface tension, due to encapsulation strain softening or rupture, is critical for predicting realistic thresholds.

Conclusions:

  • Classical perturbative results for subharmonic generation thresholds are insufficient.
  • Interfacial rheological properties, particularly effective surface tension with an upper limit, significantly influence microbubble behavior.
  • Accurate modeling of microbubble encapsulation is vital for predicting subharmonic generation thresholds and optimizing contrast-enhanced ultrasound.