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Related Experiment Videos

Acoustic field prediction for a single planar continuous-wave source using an equivalent phased array method

X Fan1, E G Moros, W L Straube

  • 1Radiation Oncology Center, Washington University School of Medicine, St. Louis, Missouri 63108, USA.

The Journal of the Acoustical Society of America
|November 28, 1997
PubMed
Summary
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A novel equivalent phased array method (EPAM) models single-source ultrasonic transducers by treating them as phased arrays. This technique accurately predicts acoustic fields, benefiting diagnostic and therapeutic ultrasound.

Area of Science:

  • Acoustics
  • Ultrasonic Transducer Modeling
  • Phased Array Theory

Background:

  • Accurate modeling of ultrasonic fields is crucial for medical applications.
  • Single-source transducers are widely used but complex to model precisely.
  • Existing methods may not fully capture the nuances of acoustic field generation.

Purpose of the Study:

  • To develop a new method for predicting acoustic fields from single-source ultrasonic transducers.
  • To adapt phased array theory for modeling single-source transducers.
  • To validate the predictive accuracy of the proposed method against experimental measurements.

Main Methods:

  • Combined phased array theory with the Rayleigh-Sommerfeld diffraction integral.
  • Treated a single-source transducer as an equivalent phased array.

Related Experiment Videos

  • Used an inverse technique to determine the excitation source (amplitude and phase) from measured pressure fields.
  • Calculated acoustic fields from the near to the far field using the derived excitation source.

    • Main Results:

    • The equivalent phased array method (EPAM) accurately predicted acoustic fields for four different transducers.
    • The method successfully identified major grating lobe locations.
    • General distributions of near and far pressure fields were accurately modeled.
    • The derived excitation source closely replicated the experimentally measured field.

    Conclusions:

    • The equivalent phased array method (EPAM) offers a robust approach to modeling single-source ultrasonic transducers.
    • This method demonstrates high predictive accuracy for acoustic field distributions.
    • EPAM holds significant potential for enhancing both diagnostic and therapeutic ultrasound applications.