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Interlaboratory acoustic power measurement.

Peter A Lewin1, Nadine Barrie-Smith, Masao Ide

  • 1School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, USA.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|February 4, 2003
PubMed
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Acoustic power measurements by three laboratories showed discrepancies up to 16.2%, depending on the target and method. An absorbing target is recommended for radiation force balance measurements for better accuracy in ultrasonic power calibration.

Area of Science:

  • Medical physics
  • Ultrasound technology
  • Metrology

Background:

  • Accurate acoustic power measurements are crucial for diagnostic ultrasound safety and efficacy.
  • Interlaboratory comparisons are essential to assess and improve measurement consistency.

Purpose of the Study:

  • To compare acoustic power measurement results from multiple laboratories.
  • To evaluate the performance of different calibration techniques and targets.

Main Methods:

  • Utilized two primary calibration techniques: planar scanning and radiation force balance.
  • Employed a standardized ultrasonic power source from the National Institute of Standards and Technology (NIST).
  • Circulated the NIST source to three participating laboratories for measurements between 1-21 MHz.

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Main Results:

  • Discrepancies in acoustic power measurements varied by target and method, reaching up to 16.2% with a reflecting target.
  • Using an absorbing target with radiation force balance showed discrepancies up to 10.6% at 2.5 MHz and 8.4% above 10 MHz.
  • The planar scanning technique showed a maximum discrepancy of 7.4% below 10 MHz.

Conclusions:

  • An absorbing target may be preferable for radiation force balance acoustic power measurements.
  • Measurements among the participating laboratories (2 research, 1 manufacturer) agreed within 16%.