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Assessment of the likely thermal index values for pulsed Doppler ultrasonic equipment - Stages II and III: experimental assessment of scanner/transducer combinations.

Shaw, A; Pay, N M; Preston, R C (1998) Assessment of the likely thermal index values for pulsed Doppler ultrasonic equipment - Stages II and III: experimental assessment of scanner/transducer combinations. NPL Report. CMAM 12

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Abstract

There is currently considerable international concern about the possible adverse effects on tissue due to the thennal effects of ultrasound. Although no-one has yet shown deleterious effects with current devices in patients, studies have shown that significant temperature rises can occur.
To address these concerns, the UK Department of Health initiated a project at the National Physical Laboratory to assess the likely thermal hazard from commercial pulsed Doppler diagnostic ultrasound equipment. The three stage project was to assess the thermal hazard by means of published prediction algorithms, by experimental methods and by improved theoretical methods.
This report covers Stages II and III, in which measurements of acoustic output and temperature rise were made on ultrasound scanners; the acoustic measurements were used to predict the temperature rise and thermal index by different methods and these predictions were compared with the temperature rise measured in thermal test objects. A summary of Stage I, which used published methods to calculate thermal indices from acoustic data supplied by manufacturers, is given in NPL Report CIRA(EXT)O 18 Assessment of the likely thermal index values for pulsed Doppler ultrasonic equipment -Stage I: calculation based on manufacturers' data which is available from The Acoustics Library at NPL.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 12
Subjects: Acoustics
Acoustics > Ultrasound
Last Modified: 02 Feb 2018 13:18
URI: http://eprintspublications.npl.co.uk/id/eprint/849

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