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Acoustical evaluation of a prototype sector-vortex phased-array applicator.

S Umemura1, C A Cain

  • 1Bioacoust. Res. Lab., Illinois Univ., Urbana, IL.

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Summary

A new ultrasound hyperthermia applicator was developed and tested. This sector-vortex phased-array device effectively generates focused acoustic power for cancer treatment.

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Area of Science:

  • Medical Physics
  • Acoustic Engineering

Background:

  • Ultrasound hyperthermia offers a non-invasive approach to cancer treatment by heating tumor tissues.
  • Effective focusing of acoustic energy is crucial for targeted hyperthermia delivery.
  • Phased-array transducers enable dynamic control over the focal point and intensity of ultrasound.

Purpose of the Study:

  • To design, construct, and acoustically evaluate a prototype sector-vortex phased-array applicator for ultrasound hyperthermia.
  • To verify the transducer's ability to generate therapeutic levels of focused acoustic power.

Main Methods:

  • Construction of a prototype phased-array transducer using lead-titanate ceramic elements arranged in sectors and tracks.
  • Theoretical prediction of annular focal fields using Mth order Bessel functions based on phase distribution.
  • Development of a 3-D acoustic field measurement system with a multichannel membrane hydrophone.
  • Measurement of acoustic fields and focal acoustic power in water under various drive modes.

Main Results:

  • The prototype transducer consists of 16 sectors and two tracks, driven by MOSFETs at 750 kHz.
  • Measured multidimensional acoustic field patterns closely matched theoretical predictions for different drive modes.
  • The applicator demonstrated the capability to produce focal acoustic power levels suitable for hyperthermia applications.

Conclusions:

  • The developed sector-vortex phased-array applicator is acoustically validated for ultrasound hyperthermia.
  • The device successfully generates controllable focal acoustic power, meeting therapeutic requirements.
  • This technology shows promise for targeted and effective hyperthermia cancer treatment.