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Aperture-based measurement of the effective radiating area of physiotherapy treatment heads: a new rapid system and detailed performance evaluation.

Hodnett, M; Gélat, P N; Zeqiri, B (2002) Aperture-based measurement of the effective radiating area of physiotherapy treatment heads: a new rapid system and detailed performance evaluation. NPL Report. CMAM 81

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Abstract

This report comprises both theoretical and experimental studies to develop a new, rapid implementation of the aperture technique for determining the effect radiating area (AER) of physiotherapy ultrasound treatment heads. The performance of the technique when using radiation force balances with both absorbing and reflecting targets is compared, alongside reference measurements performed to IEC 61689 criteria. The design and realisation of a new integrated system for determining power and AER is described, and tets and validation measurements have shown good agreement with IEC 61689 data, and with the original implementation of the aperture technique. Finite-element modelling has also been used to predict the aperture-derived AER values of the reference transducers used, and to derive correction factors for the effect of acoustic diffraction from aperture.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 81
Keywords: ultrasonic, physiotherapy, measurement, standards, modelling
Subjects: Acoustics
Acoustics > Ultrasound
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2328

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