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The feasibility of an infrared system for real-time visualisation and mapping of ultrasound fields.

Shaw, A; Nunn, J (2010) The feasibility of an infrared system for real-time visualisation and mapping of ultrasound fields. Phys. Med. Biol., 55 (11). N321-N327

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In treatment planning for ultrasound therapy it is desirable to know the 3D structure of the ultrasound field. However, mapping an ultrasound field in 3D is very slow, with even a single planar raster-scan taking typically several hours. Additionally, hydrophones are expensive and can me damaged in some therapy fields. So there is value in rapid methods for visualising and mapping the ultrasound field.
In this paper we explore the feasibility of mapping the intensity distribution by measuring the temperature distribution produced in a thin sheet of absorbing material. The thin sheet forms a window in the wall of a water tank containing the transducer. The window is oriented at 45o to the beam-axis and the distance from the transducer to the window can be varied. The temperature distribution is measured with an infra-red camera: thermal images of the inclined plane could be viewed in realtime or images could be captured for later analysis and 3D field reconstruction. In our system spatial resolution as small as 0.044 mm was achieved. We conclude that infrared thermography can be used to gain qualitative information about ultrasound fields. Thermal images are easily visualised with good spatial and thermal resolution. The focus and field structure such as side-lobes can be identified in realtime from the direct video output. 3D maps and image planes at arbitrary orientations to the beam-axis can be obtained and reconstructed within a few minutes. In this paper we are primarily interested in the technique for characterisation of High Intensity Focused Ultrasound (HIFU) fields, but other applications are possible.

Item Type: Article
Keywords: ultrasound, infrared, HIFU, field mapping
Subjects: Acoustics
Acoustics > Ultrasound
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4637

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