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A study of bubble activity generated in ex-vivo tissue by high intensity focused ultrasound (HIFU)

Record type: Article

Cancer treatment by extracorporeal high-intensity focused ultrasound (HIFU) is constrained by the time required to ablate clinically relevant tumour volumes. Although cavitation may be used to optimize HIFU treatments, its role during lesion formation is ambiguous. Clear differentiation is required between acoustic cavitation (noninertial and inertial) effects and bubble formation arising from two thermally-driven effects (the vapourization of liquid into vapour, and the exsolution of formerly dissolved permanent gas out of the liquid and into gas spaces). This study uses clinically relevant HIFU exposures in degassed water and ex vivo bovine liver to test a suite of cavitation detection techniques that exploit passive and active acoustics, audible emissions and the electrical drive power fluctuations. Exposure regimes for different cavitation activities (none, acoustic cavitation and, for ex vivo tissue only, acoustic cavitation plus thermally-driven gas space formation) were identified both in degassed water and in ex vivo liver using the detectable characteristic acoustic emissions. The detection system proved effective in both degassed water and tissue, but requires optimization for future clinical application.

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Citation

McLaughlan, James, Rivens, Ian, Leighton, Timothy and ter Haar, Gail (2010) A study of bubble activity generated in ex-vivo tissue by high intensity focused ultrasound (HIFU) Ultrasound in Medicine & Biology, 36, (8), pp. 1327-1344. (doi:10.1016/j.ultrasmedbio.2010.05.011).

More information

Published date: August 2010
Keywords: active cavitation detection, ultrasonic acoustic emissions, b-mode, boiling, hifu, passive cavitation detection, drive power fluctuations, audible emissions

Identifiers

Local EPrints ID: 162573
URI: http://eprints.soton.ac.uk/id/eprint/162573
ISSN: 0301-5629
PURE UUID: 636257b6-cd51-40db-95bb-fc718c2a3969
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750

Catalogue record

Date deposited: 24 Aug 2010 10:34
Last modified: 18 Jul 2017 12:32

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Contributors

Author: James McLaughlan
Author: Ian Rivens
Author: Gail ter Haar

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