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Related Experiment Videos

Phase detection in acoustic microscopy.

S F Levinson1

  • 1Indianapolis Center for Advanced Research, IN 46204.

Ultrasonic Imaging
|October 1, 1990
PubMed
Summary
This summary is machine-generated.

Scanning laser acoustic microscopy offers a simple method for measuring the speed of sound in biological tissues. This technique allows for detailed speed of sound mapping and the study of scattering phenomena in specimens.

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Area of Science:

  • Biophysics
  • Materials Science
  • Acoustics

Background:

  • Acoustic microscopy is valuable for non-destructive analysis of materials.
  • Measuring the speed of sound in biological tissues provides insights into tissue properties.

Purpose of the Study:

  • To present a method for collecting speed of sound data from biological specimens using scanning laser acoustic microscopy.
  • To enable direct speed of sound calculations and mapping from acoustic micrographs.

Main Methods:

  • Utilizing a scanning laser acoustic microscope with a phase detection circuit.
  • Superimposing and digitizing phase-contour lines on acoustic micrographs.
  • Mathematically modeling phase reference using polynomial functions and linear regression to account for field non-uniformities.

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  • Employing a frequency-selective "dark field" approach to study scattering.

    • Main Results:

    • Phase-contour lines were superimposed on acoustic micrographs and digitized for speed of sound calculations.
    • Mathematical modeling successfully addressed mild field non-uniformities.
    • Speed of sound maps were readily produced from phase data.
    • Useful data were obtained from biological specimens.

    Conclusions:

    • Scanning laser acoustic microscopy provides a viable and relatively simple method for obtaining speed of sound data from biological specimens.
    • The technique allows for detailed mapping of sound speed and investigation of scattering.
    • Theoretical limitations must be considered for accurate interpretation of results.