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Related Experiment Videos

Emboli detection using a new transducer design.

P Palanchon1, A Bouakaz, J Klein

  • 1Department of Cardiology, Thoraxcentre, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands. p.palanchon@erasmusmc.nl

Ultrasound in Medicine & Biology
|February 14, 2004
PubMed
Summary

A novel transducer detects gaseous emboli using nonlinear ultrasound behavior. This technology differentiates gas bubbles from solid particles by analyzing harmonic scattering, improving emboli detection and characterization.

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Nonlinear Ultrasonics

Background:

  • Gaseous emboli detection is crucial for medical diagnosis.
  • Previous studies established nonlinear bubble behavior as a detection method.
  • A specialized transducer is needed for practical application.

Purpose of the Study:

  • To develop and evaluate a novel transducer for detecting and characterizing gaseous emboli.
  • To utilize the nonlinear acoustic behavior of bubbles for selective detection.
  • To differentiate gaseous emboli from solid particles using ultrasonic signals.

Main Methods:

  • A dual-function transducer with lead zirconate-titanate (PZT) transmitter and polyvinylidene difluoride (PVDF) receiver was designed.
  • The transducer operated at a 500 kHz fundamental frequency, with reception from 250 kHz to 2.5 MHz.

Related Experiment Videos

  • Ultrasonic measurements were performed on gas bubbles (10-90 µm) and solid particles (350-550 µm).

    • Main Results:

    • Gas bubbles near resonance size exhibited significant scattering at higher harmonics (2nd-5th).
    • Bubbles approximately twice the resonance size produced subharmonic and/or ultraharmonic components.
    • Solid particles and off-resonance bubbles showed linear behavior with no harmonic generation.

    Conclusions:

    • The developed single-element transducer effectively detects and characterizes gaseous emboli.
    • Nonlinear acoustic properties allow for selective identification of gas bubbles.
    • This approach offers a promising method for distinguishing emboli from other particles.