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Efficient array design for sonotherapy.

Douglas N Stephens1, Dustin E Kruse, Arif S Ergun

  • 1University of California, Davis, CA, USA. dnstephens@ucdavis.edu

Physics in Medicine and Biology
|July 2, 2008
PubMed
Summary
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New ultrasound probes with multiple arrays offer simultaneous B-mode imaging and therapeutic heat delivery. These probes enable mild hyperthermia applications with efficient power transfer and controlled temperature rise.

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Acoustic Therapy

Background:

  • Standard ultrasound systems typically perform imaging or therapy separately.
  • Developing integrated probes for simultaneous confocal imaging and therapeutic acoustic intensities is challenging.

Purpose of the Study:

  • To design, construct, and test novel linear multi-row, multi-frequency ultrasound probes.
  • To achieve simultaneous B-mode imaging and therapeutic acoustic power delivery using a commercial ultrasound system.

Main Methods:

  • Developed triple-array probes with a center imaging array (5.3 MHz) and dual therapeutic arrays (1.54 MHz).
  • Designed two probe versions (G3 and G4) with differing therapeutic array optimizations for mechanical therapies and mild hyperthermia.
  • Utilized a KLM model to analyze power transfer efficiency and lossy contributions in the low-frequency arrays.

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Main Results:

  • Probes produced high-quality B-mode images and sufficient acoustic power for mild hyperthermia.
  • The 'thermal therapy' design achieved >4 W acoustic power with a 10.5°C internal temperature rise in 100s.
  • KLM model predictions for acoustic resistance and dissipation resistance were experimentally verified.

Conclusions:

  • The developed multi-row, multi-frequency ultrasound probes effectively integrate confocal imaging and therapeutic capabilities.
  • Optimized probe designs allow for efficient acoustic power delivery for mild hyperthermia applications with controlled thermal effects.
  • This technology advances the potential for combined diagnostic and therapeutic ultrasound procedures.