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Related Experiment Videos

A multi-element ultrasonic hyperthermia applicator with independent element control.

H R Underwood1, E C Burdette, K B Ocheltree

  • 1Bioacoustics Research Laboratory, University of Illinois, Urbana 61801.

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
|May 1, 1987
PubMed
Summary

Researchers experimentally determined ultrasonic applicator acoustic fields, comparing results with theoretical models. Unequal element excitation created complex patterns, and a model with damping improved accuracy, showing potential for targeted tissue heating.

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Area of Science:

  • Ultrasound Physics
  • Acoustic Field Characterization
  • Biomedical Engineering

Background:

  • Planar multi-element ultrasonic applicators are used in various medical applications.
  • Understanding acoustic field patterns is crucial for effective therapeutic ultrasound.
  • Existing theoretical models may not fully capture complex experimental acoustic fields.

Purpose of the Study:

  • To experimentally determine acoustic field patterns from a planar multi-element ultrasonic applicator.
  • To compare experimental findings with theoretical predictions.
  • To assess the applicator's suitability for localized tissue heating.

Main Methods:

  • Measurements of acoustic fields using square arrays of 4 and 16 elements (3.6 cm x 3.6 cm) driven at 1 MHz in water.

Related Experiment Videos

  • Characterization of acoustic beams using transverse and axial scans for different aperture sizes and element excitations.
  • Comparison of experimental data with simple theoretical models and models incorporating mechanical damping.

    • Main Results:

    • Unequal power excitation of adjacent elements resulted in multiple-peaked acoustic intensity patterns.
    • A theoretical model including mechanical damping showed improved agreement with experimental transverse and axial field patterns.
    • Experimental measurements exhibited less axial pattern ripple than predicted by either theoretical model.

    Conclusions:

    • The study provides experimental validation of acoustic field patterns generated by a multi-element ultrasonic applicator.
    • Theoretical models, particularly those including mechanical damping, can approximate experimental results but require refinement.
    • The applicator demonstrated potential for generating acoustic fields suitable for localized tissue heating applications.