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Related Experiment Videos

Acoustic microscopy system: design and preliminary results.

J B Liu1, J N Peterson, F Forsberg

  • 1Department of Radiology, Thomas Jefferson University, 132 S. 10th Street, 7th Floor, Main Building, Philadelphia, PA 19107, USA. ji-bin.liu@jefferson.edu

Ultrasonics
|March 30, 2004
PubMed
Summary

A new acoustic microscopy system was built for high-resolution 2D imaging of tissues. This system, using lithium niobate transducers, achieved detailed images of liver and spleen specimens.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Acoustics

Background:

  • High-resolution imaging is crucial for biological tissue analysis.
  • Conventional microscopy techniques have limitations in visualizing subsurface structures.
  • Acoustic microscopy offers a non-destructive method for detailed tissue characterization.

Purpose of the Study:

  • To design and construct a novel acoustic microscopy system for 2D C-plane imaging.
  • To evaluate the performance of single-element lithium niobate transducers at 55-75 MHz.
  • To demonstrate the system's capability in imaging biological tissue specimens.

Main Methods:

  • Fabrication of lithium niobate (LiNbO3) transducers with specific thicknesses for 55 and 75 MHz operation.
  • Integration of transducers with acoustic backing, matching layers, and an epoxy lens.

Related Experiment Videos

  • Utilizing a 3D motorized stage, pulser/receiver, 2 GHz ADC, and custom Matlab software for data acquisition and display.
  • Performance characterization using a steel plate and imaging of liver and spleen tissue samples.

    • Main Results:

    • Two probes were fabricated, operating at 54.05 MHz (6.76 MHz bandwidth) and 82 MHz (~23 MHz bandwidth).
    • Achieved axial and lateral resolutions of approximately 114 and 188 microm for the first probe, and 33 and 81 microm for the second.
    • Demonstrated clear imaging of fine details on a penny and distinct layers within splenic tissue, including capsule and trabecular structures.

    Conclusions:

    • A functional acoustic microscopy system operating in the 55-75 MHz range was successfully developed.
    • The system demonstrated feasibility for obtaining high-resolution 2D images of biological tissue.
    • The results highlight the potential of this acoustic microscopy system for detailed tissue analysis.