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Related Experiment Videos

Reflections on tissue characterisation.

E T Costa1, S Leeman

  • 1Department of Medical Engineering and Physics, King's College School of Medicine and Dentistry, Dulwich Hospital, London, UK.

Physics in Medicine and Biology
|November 1, 1989
PubMed
Summary
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This study explores how material properties like absorption and velocity dispersion affect ultrasound reflectivity at interfaces. Experiments confirm theoretical predictions for common materials, advancing reflectivity measurement techniques.

Area of Science:

  • Acoustics
  • Materials Science
  • Ultrasound Physics

Background:

  • Reflectivity at planar interfaces is typically explained by acoustic impedance mismatch.
  • Theoretical models suggest absorption and velocity dispersion also play a role in mediating reflectivity.
  • Understanding these factors is crucial for accurate ultrasound applications.

Purpose of the Study:

  • To investigate theoretical predictions regarding the influence of absorption and velocity dispersion on interface reflectivity.
  • To develop and demonstrate a novel technique for measuring the frequency-dependent reflectivity of ultrasound.
  • To explore the simultaneous display of temporal and spectral ultrasound pulse properties.

Main Methods:

  • Utilized a purpose-built hydrophone for precise reflectivity measurements.

Related Experiment Videos

  • Experimentally tested reflectivity for perspex/water and neoprene/water interfaces.
  • Developed an approach for simultaneous temporal and spectral analysis of ultrasound pulses.

    • Main Results:

    • Experimental results for perspex/water and neoprene/water interfaces were found to be consistent with theoretical predictions.
    • Demonstrated the feasibility of measuring frequency-dependent reflectivity.
    • Showcased a method for visualizing both temporal and spectral characteristics of ultrasound pulses.

    Conclusions:

    • Absorption and velocity dispersion are significant factors influencing ultrasound reflectivity at planar interfaces.
    • The developed measurement technique and display approach are effective for reflectivity studies.
    • The proposed methods have potential applications in non-linear ultrasound propagation analysis.