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Related Experiment Videos

Pressure waveforms generated by a Dornier extra-corporeal shock-wave lithotripter.

A J Coleman1, J E Saunders, R C Preston

  • 1Department of Medical Physics, St. Thomas' Hospital, London.

Ultrasound in Medicine & Biology
|October 1, 1987
PubMed
Summary

Accurate measurements of shock wave lithotripter acoustic fields reveal peak positive pressures of 38.6 MPa and peak negative pressures of 10.1 MPa at the focus. These findings offer improved insights into shock wave lithotripsy (SWL) device performance.

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Medical Physics

Background:

  • Shock wave lithotripsy (SWL) is a key treatment for kidney stones.
  • Accurate characterization of the acoustic field is crucial for optimizing SWL efficacy and safety.
  • Previous pressure measurements may have limitations due to hydrophone frequency response.

Purpose of the Study:

  • To accurately measure pressure waveforms in the acoustic field of a Dornier (HM3) shock wave lithotripter.
  • To estimate peak-positive (p+) and peak-negative (p-) pressures at various field locations.
  • To provide more reliable data compared to previous lithotripter acoustic field studies.

Main Methods:

  • Utilized a bilaminar shielded PVDF membrane hydrophone for precise waveform measurement in water.

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  • Measured pressure waveforms at different positions within the lithotripter's acoustic field.
  • Estimated peak-positive (p+) and peak-negative (p-) pressures from recorded waveforms.

    • Main Results:

    • At the focus, peak-positive pressure (p+) reached 38.6 MPa (SD=9.0 MPa) and peak-negative pressure (p-) was 10.1 MPa (SD=1.0 MPa) at 20 kV.
    • Peak-positive pressure decreased by 50% (6 dB) approximately 60 mm from the focus along the major axis and within a 10 mm radius in the focal plane.
    • Shot-to-shot variations in p+ (±25%) were attributed to electrical discharge variability.

    Conclusions:

    • The PVDF hydrophone provided more accurate acoustic field measurements due to its flat frequency response.
    • Detailed pressure distribution data were obtained for the Dornier (HM3) lithotripter.
    • These findings contribute to a better understanding of SWL acoustic field characteristics and device performance.