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Ultrasound-induced heating in a foetal skull bone phantom and its dependence on beam width and perfusion

Ultrasound-induced heating in a foetal skull bone phantom and its dependence on beam width and perfusion
Ultrasound-induced heating in a foetal skull bone phantom and its dependence on beam width and perfusion
The cooling effect of single and multiple perfusing channels has been measured in a model of human foetal skull bone heated by wide and narrow beams of simulated pulsed spectral Doppler ultrasound (US). A focussed transducer operating with a centre frequency of 3.5 MHz, that emitted pulses of 5.7 MUs duration with a repetition frequency of 8 kHz, was used. This produced a beam of power 100 ± 2 mW with –6 dB diameters of 3.1 mm and 7.8 mm at 9 cm and 6 cm, respectively, from the transducer face. Arterial perfusion was simulated by allowing distilled water to flow in a large single channel or a grid of fine channels near the heated bone target. This study has established that: 1. perfusion-induced cooling is significantly enhanced when the bone phantom is heated by a wide rather than a narrow beam; 2. irrespective of the US beam width, a grid of small channels is more effective in cooling a heated bone target than a single larger diameter channel with the same volume flow rate; 3. the measured temperature rise and rate of temperature rise support the prediction of inverse proportionality to the US beam width; and 4. the perfusion time constants determined in our phantom model are 2 to 30 times larger than that assumed for the thermal index (TIB) algorithm.
pulsed ultrasound, phantom, foetus, perfusion, bone heating, narrow and wide ultrasound beams
0301-5629
779-788
Vella, Gilbert J.
b55c4069-2d6b-4242-8850-aade34794882
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Duck, Francis A.
46fb1f23-a818-48a9-a377-d8faa5b75087
Barnett, Stanley B.
37963b89-ebfb-4d12-918a-9df1d5937d4f
Vella, Gilbert J.
b55c4069-2d6b-4242-8850-aade34794882
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Duck, Francis A.
46fb1f23-a818-48a9-a377-d8faa5b75087
Barnett, Stanley B.
37963b89-ebfb-4d12-918a-9df1d5937d4f

Vella, Gilbert J., Humphrey, Victor F., Duck, Francis A. and Barnett, Stanley B. (2003) Ultrasound-induced heating in a foetal skull bone phantom and its dependence on beam width and perfusion. Ultrasound in Medicine & Biology, 29 (6), 779-788. (doi:10.1016/S0301-5629(03)00030-9).

Record type: Article

Abstract

The cooling effect of single and multiple perfusing channels has been measured in a model of human foetal skull bone heated by wide and narrow beams of simulated pulsed spectral Doppler ultrasound (US). A focussed transducer operating with a centre frequency of 3.5 MHz, that emitted pulses of 5.7 MUs duration with a repetition frequency of 8 kHz, was used. This produced a beam of power 100 ± 2 mW with –6 dB diameters of 3.1 mm and 7.8 mm at 9 cm and 6 cm, respectively, from the transducer face. Arterial perfusion was simulated by allowing distilled water to flow in a large single channel or a grid of fine channels near the heated bone target. This study has established that: 1. perfusion-induced cooling is significantly enhanced when the bone phantom is heated by a wide rather than a narrow beam; 2. irrespective of the US beam width, a grid of small channels is more effective in cooling a heated bone target than a single larger diameter channel with the same volume flow rate; 3. the measured temperature rise and rate of temperature rise support the prediction of inverse proportionality to the US beam width; and 4. the perfusion time constants determined in our phantom model are 2 to 30 times larger than that assumed for the thermal index (TIB) algorithm.

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More information

Published date: June 2003
Keywords: pulsed ultrasound, phantom, foetus, perfusion, bone heating, narrow and wide ultrasound beams

Identifiers

Local EPrints ID: 10338
URI: http://eprints.soton.ac.uk/id/eprint/10338
ISSN: 0301-5629
PURE UUID: 7bc00b41-e5fb-441a-a3d0-a9c7bfdd213c
ORCID for Victor F. Humphrey: ORCID iD orcid.org/0000-0002-3580-5373

Catalogue record

Date deposited: 02 Jun 2005
Last modified: 16 Mar 2024 03:34

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Contributors

Author: Gilbert J. Vella
Author: Francis A. Duck
Author: Stanley B. Barnett

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