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Proposed standard thermal test object for medical ultrasound.

Shaw, A; Pay, N M; Preston, R C; Bond, A D (1999) Proposed standard thermal test object for medical ultrasound. Ultrasound Med. Biol., 25 (1). pp. 121-132.

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Abstract

A general design for a thermal test object (TTO) is proposed. A number of novel features make the design particularly suitable for use as a standardised device for assessing the heating capability of diagnostic ultrasound beams. To assess performance, soft-tissue TTOs have been made containing thin-film thermocouples sandwiched between discs of tissue-mimicking gel. Installed in an appropiate measurement system, these TTOs exhibit excellent thermal and spatial resolution, allowing the ultrasound beam to be located rapidly and reproducibly. The measured temperature rise after 3 minutes of heating has been compared with theoretical predictions based on measured pressure distributions, and agreement is within 10%. Other studies have shown that soft-tissue and bone-mimicking TTOs can be used to evaluate a wide range of ultrasound fields and that different physical tissue models can be simulated. It is concluded that this design would be suitable for providing reference assessments of the thermal hazard posed by diagnostic ultrasound under standardised conditions.

Item Type: Article
Keywords: ultrasound, ultrasonic heating, thermal phantom, thermal test object, thermal hazard, tissue-mimicking material, thin-film thermocouple, thermal index
Subjects: Acoustics
Acoustics > Ultrasound
Last Modified: 02 Feb 2018 13:18
URI: http://eprintspublications.npl.co.uk/id/eprint/1908

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