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Self-Navigated 3D Acoustic Tweezers in Complex Media Based on Time Reversal.

Ye Yang1,2, Teng Ma1,2, Sinan Li3

  • 1Paul C. Lauterbur Research Center for Biomedical Imaging, Key Laboratory for Magnetic Resonance and Multimodality Imaging of Guangdong Province, Shenzhen Key Laboratory of Ultrasound Imaging and Therapy, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.

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This study introduces 3D acoustic tweezers capable of manipulating microparticles in opaque and complex environments. This breakthrough enables precise control in challenging media, paving the way for advanced applications.

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Area of Science:

  • Biomedical Engineering
  • Acoustic Manipulation
  • Ultrasonic Imaging

Background:

  • Acoustic tweezers offer noncontact, noninvasive microparticle manipulation.
  • Challenges exist in opaque and heterogeneous media due to signal distortion.

Purpose of the Study:

  • To develop 3D acoustic tweezers for manipulation in nontransparent and heterogeneous media.
  • To guide and monitor manipulation using real-time 3D ultrasonic imaging.

Main Methods:

  • Designed a 1.04 MHz 256-element 2D matrix array for 3D acoustic tweezers.
  • Utilized real-time 3D ultrasonic imaging for guidance and monitoring.
  • Employed time reversal principle to correct acoustic wave distortions in heterogeneous media.

Main Results:

  • Successfully demonstrated 3D acoustic manipulation in nontransparent media.
  • Achieved dynamic 3D manipulation of multiple microparticles using multifoci and vortex traps.
  • Enabled precise manipulation through resin baffles and ex vivo skulls.

Conclusions:

  • Developed a robust 3D acoustic tweezers system for challenging environments.
  • The time reversal method effectively corrects acoustic distortions.
  • Potential applications include acoustical drug delivery and precise medical treatments.