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Harmonic vibro-acoustography.

Shigao Chen1, Randall R Kinnick, James F Greenleaf

  • 1Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN 55905, USA. chen.shigao@mayo.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 28, 2007
PubMed
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Harmonic acoustic emission in vibro-acoustography significantly enhances contrast for microbubble imaging. This advanced technique improves visualization of nonlinear object properties and selective microbubble detection.

Area of Science:

  • Medical Imaging
  • Acoustics
  • Biophysics

Background:

  • Vibro-acoustography utilizes ultrasound radiation force for imaging.
  • Current methods image acoustic emission at the fundamental difference frequency.

Purpose of the Study:

  • Investigate the feasibility of imaging at twice the difference frequency (harmonic acoustic emission).
  • Explore origins and applications of harmonic acoustic emission in vibro-acoustography.

Main Methods:

  • Theoretical exploration of harmonic acoustic emission origins.
  • Experimental validation using microbubbles near resonance.
  • Comparison of contrast enhancement between fundamental and harmonic acoustic emission.

Main Results:

Related Experiment Videos

  • Microbubbles near resonance generate significant harmonic acoustic emission due to high nonlinearity.
  • Harmonic acoustic emission improves contrast by 17-23 dB compared to fundamental emission.
  • Demonstrated selective detection of microbubbles.

Conclusions:

  • Harmonic acoustic emission is a feasible enhancement for vibro-acoustography.
  • This technique offers improved contrast and selective imaging of microbubbles.
  • Potential applications include nonlinear imaging and perfusion imaging.