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Relationship between acoustic power and acoustic radiation force on absorbing and reflecting targets for spherically focusing radiators.

Gelat, P N; Shaw, A (2015) Relationship between acoustic power and acoustic radiation force on absorbing and reflecting targets for spherically focusing radiators. Ultrasound Med. Biol., 41 (3). pp. 832-844.

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Abstract

Total acoustic output power is an important parameter required by Standards for most ultrasonic medical equipment including high intensity focused ultrasound (HIFU) systems. Radiation force balances are routinely used; however, radiation force is not strictly dependent on the ultrasound power but, rather, on the wave momentum resolved in one direction. Consequently, measurements based on radiation force become progressively less accurate as the ultrasound wave deviates further from a true plane wave. HIFU transducers can be very strongly focused with F-numbers less than one: under these conditions, the uncertainty associated with use of the radiation force method becomes very significant. International Standard IEC61161 suggests plane-wave correction factors for unfocused transducers radiating onto an ideal absorbing target, and focusing corrections for focused transducers radiating onto ideal absorbing targets and onto conical reflecting targets. In this paper, a combination of finite element and boundary element modelling was used to calculate the relationship between radiation force and total power for both absorbing and conical reflecting targets for transducers ranging from planar to F-number of 0.5 (hemispherical) and compare with the recommendations of IEC61161.

Item Type: Article
Keywords: Acoustic radiation force, Acoustic power measurement, Ultrasound metrology, Focused ultrasonic fields, Finite element modelling, Boundary element modelling
Subjects: Acoustics
Acoustics > Ultrasound
Identification number/DOI: 10.1016/j.ultrasmedbio.2014.09.021
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6577

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