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Studies of the cavitational effects of clinical ultrasound by sonoluminescence: 3. Cavitation from pulses a few microseconds in length

Studies of the cavitational effects of clinical ultrasound by sonoluminescence: 3. Cavitation from pulses a few microseconds in length
Studies of the cavitational effects of clinical ultrasound by sonoluminescence: 3. Cavitation from pulses a few microseconds in length
Sonoluminescence can readily be seen when aerated water is insonated with continuous wave therapeutic ultrasound at room temperature but is not easily observed when short pulses of diagnostic ultrasound are used. In this work an ultrasound generator, operating in the region of 1 MHz and capable of producing pulses of different length and repetition rate, was used for insonation. The pulse repetition rate of the ultrasound was fixed at 1 kHz since this is characteristic of diagnostic machines, and a series of thresholds for sonoluminescence as obtained for two transducers, one therapeutic and one diagnostic, as the number of cycles in each pulse was varied. Sonoluminescence was observed for pulses of a few cycles, but the ultrasound intensity threshold for onset increased sharply with decreasing pulse length. Under all conditions tested, sonoluminescence was more readily sustained than initiated. At about 20 cycles per pulse, peak negative pressures of about 400 kPa initiated sonoluminescence. These conditions are well within the range of some regimens for Doppler ultrasound and not far removed from the diagnostic situation.
1139-1151
Pickworth, M.J.W.
8a0e0f89-fb53-4538-abb8-507923eeaf08
Dendy, P.P.
ee1144be-8597-4abb-b01d-54470a991ba1
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Worpe, E.
1cf77803-0cd7-4a23-b47b-b1e6cfb2bf6c
Chivers, R.C.
aca249e8-b420-4fa4-99e9-8eb0369d3b90
Pickworth, M.J.W.
8a0e0f89-fb53-4538-abb8-507923eeaf08
Dendy, P.P.
ee1144be-8597-4abb-b01d-54470a991ba1
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Worpe, E.
1cf77803-0cd7-4a23-b47b-b1e6cfb2bf6c
Chivers, R.C.
aca249e8-b420-4fa4-99e9-8eb0369d3b90

Pickworth, M.J.W., Dendy, P.P., Leighton, T.G., Worpe, E. and Chivers, R.C. (1989) Studies of the cavitational effects of clinical ultrasound by sonoluminescence: 3. Cavitation from pulses a few microseconds in length. Physics in Medicine and Biology, 34 (9), 1139-1151. (doi:10.1088/0031-9155/34/9/001).

Record type: Article

Abstract

Sonoluminescence can readily be seen when aerated water is insonated with continuous wave therapeutic ultrasound at room temperature but is not easily observed when short pulses of diagnostic ultrasound are used. In this work an ultrasound generator, operating in the region of 1 MHz and capable of producing pulses of different length and repetition rate, was used for insonation. The pulse repetition rate of the ultrasound was fixed at 1 kHz since this is characteristic of diagnostic machines, and a series of thresholds for sonoluminescence as obtained for two transducers, one therapeutic and one diagnostic, as the number of cycles in each pulse was varied. Sonoluminescence was observed for pulses of a few cycles, but the ultrasound intensity threshold for onset increased sharply with decreasing pulse length. Under all conditions tested, sonoluminescence was more readily sustained than initiated. At about 20 cycles per pulse, peak negative pressures of about 400 kPa initiated sonoluminescence. These conditions are well within the range of some regimens for Doppler ultrasound and not far removed from the diagnostic situation.

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Published date: 1989
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 349440
URI: https://eprints.soton.ac.uk/id/eprint/349440
PURE UUID: 635f3047-7e07-42a4-88da-e2274ae28d73
ORCID for T.G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 05 Mar 2013 14:12
Last modified: 06 Jun 2018 13:08

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