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Related Experiment Videos

Nonlinear propagation and the output indices

E L Carstensen1, D Dalecki, S M Gracewski

  • 1Department of Electrical, Engineering, The Rochester Center for Biomedical Ultrasound, The University of Rochester, New York 14627, USA.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|February 10, 1999
PubMed
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Current ultrasound exposimetry protocols may underestimate acoustic pressure due to nonlinear propagation. Linear extrapolation and derating methods, alongside World Federation of Ultrasound in Medicine and Biology recommendations, offer more accurate in situ pressure estimations for bioeffects.

Area of Science:

  • Medical Physics
  • Ultrasound Technology
  • Acoustics

Background:

  • Current ultrasound exposimetry protocols may underestimate acoustic pressure in situ.
  • Nonlinear propagation effects are often ignored, leading to inaccurate measurements.
  • Existing methods may not accurately reflect acoustic fields at high output levels.

Purpose of the Study:

  • To address the underestimation of acoustic pressure in ultrasound exposimetry.
  • To evaluate methods for improving the accuracy of in situ acoustic pressure measurements.
  • To compare current protocols with recommendations for predicting non-thermal biological effects.

Main Methods:

  • Extrapolating pressures linearly from low-amplitude measurements in water.
  • Linearly derating extrapolated values to estimate in situ fields.

Related Experiment Videos

  • Analyzing the mechanical index's accuracy at varying output levels.

    • Main Results:

    • Ignoring nonlinear propagation leads to significant underestimates of in situ acoustic pressure.
    • Linear extrapolation and derating provide improved estimates.
    • The mechanical index may be inaccurate at high output levels, deviating from the focus.
    • World Federation of Ultrasound in Medicine and Biology recommendations mitigate nonlinear propagation issues.

    Conclusions:

    • Accurate in situ acoustic pressure measurement is crucial for predicting non-thermal bioeffects.
    • Revised exposimetry protocols incorporating nonlinear propagation are necessary.
    • Recommendations from the World Federation of Ultrasound in Medicine and Biology offer a preferable approach for non-thermal bioeffect assessment.