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Surface heating by transvaginal transducers.

J Calvert1, F Duck, S Clift

  • 1Medical Physics Department, Royal United Hospital, Bath, UK.

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
|March 29, 2007
PubMed
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Transvaginal ultrasound transducers generate minimal heat in fetal tissue, with surface temperature rises below 1 degree Celsius at 1 cm depth. This study validates International Electrotechnical Commission (IEC) safety standards for ultrasound devices.

Area of Science:

  • Medical Imaging Physics
  • Biomedical Engineering
  • Ultrasound Safety

Background:

  • Transvaginal ultrasound is widely used in obstetrics and gynecology.
  • Ensuring patient safety during ultrasound procedures is paramount.
  • Manufacturing safety standards, such as those from the International Electrotechnical Commission (IEC), require validation through empirical studies.

Purpose of the Study:

  • To investigate tissue heating near transvaginal ultrasound transducer surfaces.
  • To assess the validity of current IEC manufacturing safety standards.
  • To quantify temperature increases in simulated human tissue.

Main Methods:

  • Temperature measurements were taken using miniature thermocouples in a layered soft-tissue mimicking material (TMM).

Related Experiment Videos

  • Two transvaginal transducers from different manufacturers were tested in B-mode, color-flow, and pulsed Doppler modes.
  • Measured temperature profiles were compared with analytical and numerical model predictions.

    • Main Results:

    • Maximum heating occurred at the transducer-TMM interface, decreasing significantly with depth.
    • A local temperature maximum was observed during pulsed Doppler mode.
    • A 3D finite-element model provided more accurate temperature predictions than a simple analytical model.

    Conclusions:

    • The IEC's allowed surface temperature rise of 6°C may contribute 0.5–1°C to fetal tissue temperature at 1 cm depth.
    • Tissue heating beyond 1 cm depth is negligible.
    • Current safety standards appear adequate for transvaginal ultrasound applications.