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Exploiting thermochromic materials for the rapid quality assurance of physiotherapy ultrasound treatment heads.

Butterworth, I; Barrie, J; Zeqiri, B; Zauhar, G*; Parisot, B (2012) Exploiting thermochromic materials for the rapid quality assurance of physiotherapy ultrasound treatment heads. Ultrasound Med. Biol., 38 (5). pp. 767-776.

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Abstract

Significant non-uniformities in the acoustic intensity distribution of generated by physiotherapy ultrasound treatment heads are not uncommon, potentially leading to significant localised temperature rises and tissue damage. An acoustic absorber tile has been developed to provide rapid quality assurance of ultrasonic physiotherapy transducers. As a bench-top device, the use of the tile is designed to mimic the nature of the physiotherapeutic application, requiring minimal training. Two designs where thermochromic pigments are added to the various polymeric layers of the tile are presented. Testing has been conducted with two physiotherapy treatment heads of differing performance, one of them notably exhibiting a strong intensity `hot-spot¿ in localised acoustic time-averaged intensity. Findings show good qualitative agreement with classical hydrophone scans. Techniques are explored for the correction of non-linearities in the thermochromic relationship, to enhance the accuracy of quantitative assessment.

Item Type: Article
Keywords: Ultrasound physiotherapy, quality assurance, thermochromic pigment, acoustic absorber, intensity distribution
Subjects: Acoustics
Acoustics > Ultrasound
Identification number/DOI: 10.1016/j.ultrasmedbio.2012.01.021
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5480

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