Nonspherical oscillations of ultrasound contrast agent microbubbles.

@article{Dollet2008NonsphericalOO,
  title={Nonspherical oscillations of ultrasound contrast agent microbubbles.},
  author={Benjamin Dollet and Sander M van der Meer and Valeria Garbin and Nico de Jong and Detlef Lohse and Michel Versluis},
  journal={Ultrasound in medicine & biology},
  year={2008},
  volume={34 9},
  pages={1465-73}
}
The occurrence of nonspherical oscillations (or surface modes) of coated microbubbles, used as ultrasound contrast agents in medical imaging, is investigated using ultra-high-speed optical imaging. Optical tweezers designed to micromanipulate single bubbles in 3-D are used to trap the bubbles far from any boundary, enabling a controlled study of the nonspherical oscillations of free-floating bubbles. Nonspherical oscillations appear as a parametric instability and display subharmonic behavior… CONTINUE READING