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Infrared mapping of ultrasound fields generated by medical transducers: feasibility of determining absolute intensity levels.

Khokhlova, V A*; Shmeleva, S M*; Gavrilov, L R*; Martin, E; Sadhoo, N; Shaw, A (2013) Infrared mapping of ultrasound fields generated by medical transducers: feasibility of determining absolute intensity levels. J. Acoust. Soc. Am., 134 (2). pp. 1586-1597.

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Abstract

In recent years, considerable progress has been achieved in using of infrared techniques for measuring thermal and acoustic fields of high intensity focused ultrasound (HIFU) transducers. The method is based on infrared camera measurement of the temperature rise induced by low amplitude short ultrasonic bursts in a thin absorber. Here the method is extended to estimate the absolute intensity values of HIFU transducers. The implemented approach correlated the temperature rise measured in an absorber with the use of IR camera and pressure distribution measured in water with the use of the hydrophone. The measurements were carried out for two focused HIFU transducers and therapeutic flat transducer. Corresponding correction factors between the free field intensity and temperature were obtained and allowed the conversion of temperature images to intensity distributions.

Item Type: Article
Keywords: ultrasound, hifu, infrared, intensity, measurement
Subjects: Acoustics
Acoustics > Ultrasound
Identification number/DOI: 10.1121/1.4812878
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5893

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