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Secondary bjerknes forces deform targeted microbubbles.

Tom J A Kokhuis1, Valeria Garbin, Klazina Kooiman

  • 1Biomedical Engineering, Thorax Center, Erasmus MC, Rotterdam, The Netherlands. t.kokhuis@erasmusmc.nl

Ultrasound in Medicine & Biology
|January 26, 2013
PubMed
Summary
This summary is machine-generated.

Secondary Bjerknes forces cause targeted microbubbles to deform and recoil. These forces also rupture molecular adhesion, enabling quantification of binding forces crucial for molecular imaging applications.

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Area of Science:

  • Acoustic physics
  • Biomaterials science
  • Molecular imaging

Background:

  • Targeted microbubbles are essential for molecular imaging.
  • Understanding their behavior under ultrasound is critical for advancing diagnostic techniques.

Purpose of the Study:

  • To investigate the effects of secondary Bjerknes forces on targeted microbubbles.
  • To quantify the binding forces between microbubbles and surfaces.

Main Methods:

  • High-speed optical imaging to observe microbubble deformation and recoil.
  • Modeling temporal dynamics as a mass-spring system.
  • Hydrodynamic point particle model for translational dynamics.
  • Quantification of binding forces by measuring rupture thresholds.

Main Results:

  • Microbubbles deform towards neighboring bubbles and recoil due to secondary Bjerknes forces.
  • Effective spring constant (k) of the order 10(-3) Nm(-1) was determined.
  • Binding force between biotinylated microbubbles and avidin surfaces measured between 0.9-2 nN.
  • Rupture mechanism involves lipid anchor pull-out from the microbubble shell.

Conclusions:

  • Secondary Bjerknes forces significantly influence microbubble dynamics and adhesion.
  • The study provides a method for quantifying microbubble-surface binding forces.
  • Findings are crucial for optimizing ultrasound-based molecular imaging and drug delivery.