Development of a thermal test object for the measurement of ultrasound intracavity transducer self-heating

Ultrasound in Medicine & Biology
Alban L T KillingbackD K Nassiri

Abstract

The elevated surface temperature of diagnostic ultrasound transducers imposes an important limitation to their safe use in clinical situations. Moreover, particular care should be taken if transvaginal transducers are to be used during routine scans in the first few weeks of pregnancy as the transducer surface can be very close to embryonic/fetal tissues. Published results have shown that the heating of tissue due to transducer self-heating can equal and often exceed the acoustic heating contribution. In this article, we report the development of a portable self contained thermal test object (TTO) capable of assessing the self-heating of intracavity diagnostic ultrasound transducers. The thermal conductivity and volumetric heat capacity of the tissue mimicking material (TMM) used in the TTO were measured, yielding values of (0.56 +/- 0.01) W m(-1) K(-1) and (3.5 +/- 0.8) MJ m(-3) K(-1). The speed of sound of the TMM was measured as 1540 m s(-1) and the attenuation over a frequency range of 2 to 10 MHz was found to be (0.50 +/- 0.01) dB cm(-1) MHz(-1). These results are in excellent agreement with the International Electrotechnical Commission (IEC 60601-2-37) requirements and the previously published properties of biological sof...Continue Reading

References

Feb 8, 2003·European Journal of Ultrasound : Official Journal of the European Federation of Societies for Ultrasound in Medicine and Biology·T J Atkins, F A Duck
Mar 29, 2007·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·J CalvertH Azaime

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Citations

Apr 3, 2009·Journal of Medical Engineering & Technology·M A El-BrawanyK Lozhken
Aug 23, 2011·Ultrasound in Medicine & Biology·Richard G AxellChris H Oxley
Aug 26, 2011·Anesthesiology·Hariharan Shankar, Paul S Pagel
Feb 24, 2017·Ultrasound : Journal of the British Medical Ultrasound Society·Piero MiloroAdam Shaw
Feb 16, 2021·Frontiers in Neuroscience·Danli PengMelanie Stamp

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