Pulsed enhancement of acoustic cavitation: A postulated model

Ciaravino, Victor; Flynn, H. G.; Miller, Morton W.

doi:10.1016/0301-5629(81)90005-3

Cited by 69 publications

(35 citation statements)

References 7 publications

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“…In pressure anti-nodes, the mechanical equilibrium radius of these bubbles is contained in the [0. [3][4][5][6][7][8][9] lm range [28]. The presence of bubbles with radii greater than the linear resonance radius R r [29], about 3 lm, is uncertain.…”

Section: The B Regimementioning

confidence: 97%

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Evolution of an 1 MHz ultrasonic cavitation bubble field in a chopped irradiation mode

Labouret¹,

Frohly²,

Rivart³

2006

Ultrasonics Sonochemistry

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In this paper the evolution of an ultrasonic cavitation bubble field is studied by means of the void rate, the cavitation noise power and the electric power that feeds the ultrasonic transducer. The ultrasonic irradiation is performed in chopped mode. It is observed two kinds of evolution that differ respectively by a slow (A regime) and a fast (B regime) void rate increase. They correspond to cavitation regimes that are identified as respectively a stable cavitation and an inertial cavitation field. The beginning of the fast increase of the void rate is delayed from the irradiation start and this delay depends on the chopping frequency of the irradiation mode.

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Section: The B Regimementioning

confidence: 97%

“…The chopped ultrasonic irradiation mode (or pulsed mode if wave emissions are short) modifies both the cavitation thresholds [1][2][3][4] and the intensity of the cavitation effects [5][6][7][8][9][10] according to the chopping characteristics.…”

Section: Introductionmentioning

confidence: 99%

Evolution of an 1 MHz ultrasonic cavitation bubble field in a chopped irradiation mode

Labouret¹,

Frohly²,

Rivart³

2006

Ultrasonics Sonochemistry

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“…12 The dependence of other cavitational effects on pulse parameters and gas content has also been observed by many other researchers. 8,[32][33][34][35][36][37] In this paper, we used the optical attenuation method to study the effects of pulse parameters and dissolved gas concentration on the dynamics of a bubble cloud generated by histotripsy pulses at a tissue-water interface. Pulse parameters studied include pulse duration, peak rarefactional pressure, and PRF.…”

Section: Introductionmentioning

confidence: 99%

Effects of acoustic parameters on bubble cloud dynamics in ultrasound tissue erosion (histotripsy)

Hall

Fowlkes

et al. 2007

The Journal of the Acoustical Society of America

102

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High intensity pulsed ultrasound can produce significant mechanical tissue fractionation with sharp boundaries ("histotripsy"). At a tissue-fluid interface, histotripsy produces clearly demarcated tissue erosion and the erosion efficiency depends on pulse parameters. Acoustic cavitation is believed to be the primary mechanism for the histotripsy process. To investigate the physical basis of the dependence of tissue erosion on pulse parameters, an optical method was used to monitor the effects of pulse parameters on the cavitating bubble cloud generated by histotripsy pulses at a tissue-water interface. The pulse parameters studied include pulse duration, peak rarefactional pressure, and pulse repetition frequency (PRF). Results show that the duration of growth and collapse (collapse cycle) of the bubble cloud increased with increasing pulse duration, peak rarefactional pressure, and PRF when the next pulse arrived after the collapse of the previous bubble cloud. When the PRF was too high such that the next pulse arrived before the collapse of the previous bubble cloud, only a portion of histotripsy pulses could effectively create and collapse the bubble cloud. The collapse cycle of the bubble cloud also increased with increasing gas concentration. These results may explain previous in vitro results on effects of pulse parameters on tissue erosion.

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“…Pressure thresholds are lower, and cavitation effects enhanced, for longer pulses, longer exposure times and higher pulse repetition frequencies (Ciaravino et al 1981), possibly due to partly developed bubbles or cavitation products from one cycle or pulse persisting to seed the following one. Low viscosity favours a lower pressure threshold, as does increased temperature (which might be caused by the ultrasonic exposure itself), partly due to reduced gas solubility, surface tension and viscosity.…”

Section: Exposure Parameters Of Relevance To Cavitation Hazardmentioning

confidence: 96%

WFUMB safety symposium on echo-contrast agents: Exposure from diagnostic ultrasound equipment relating to cavitation risk

Whittingham

2007

Ultrasound in Medicine & Biology

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Pulsed enhancement of acoustic cavitation: A postulated model

Cited by 69 publications

References 7 publications

Evolution of an 1 MHz ultrasonic cavitation bubble field in a chopped irradiation mode

Evolution of an 1 MHz ultrasonic cavitation bubble field in a chopped irradiation mode

Effects of acoustic parameters on bubble cloud dynamics in ultrasound tissue erosion (histotripsy)

WFUMB safety symposium on echo-contrast agents: Exposure from diagnostic ultrasound equipment relating to cavitation risk

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