Two-threshold cavitation regime

Sankin, G. N.; Teslenko, V. S.

doi:10.1134/1.1639433

Cited by 22 publications

(21 citation statements)

References 4 publications

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“…Despite the similarity, our experiments suggest that it was the shock from the incident wave which caused the cavitation in our case. Cavitation clouds have also been generated by applying very large tensile pulses to liquid with a single-cycle lithotripsy-type shockwave, 20 when the peak negative pressure exceeded 33 MPa. However, it is exceptionally difficult to achieve such a negativepressure level using a harmonic waveform, because of the limits imposed by nonlinear acoustic saturation.…”

Section: Discussionmentioning

confidence: 99%

“…In their study, individual cavitation bubbles were apparent at low pressures, but cavitation clouds appeared consistently when a threshold of approximately 33 MPa peak negative pressure was exceeded. 20,22 While it was found that cavitation clouds could be excited by direct action of the tensile tail of a shockwave, clouds were also observed to form by the reflection and inversion of the compressive shock from the water-air interface at the top of the tank. In an in vivo scenario, such cavitation may occur as a result of the reflection of strongly nonlinear waves from pre-existing gas bodies in tissues such as lung or intestine.…”

Section: Introductionmentioning

confidence: 99%

“…2,[19][20][21] Cavitation clouds generated using focused ultrasound have been observed to form transiently in water with CW sonication at 2.5 MHz by Willard 17 and at 1 MHz by Neppiras and Coakley. 18 More recently, Sankin and Teslenko 20 have generated cavitation clouds in distilled water using a strong lithotripter a) Author to whom correspondence should be addressed. Electronic mail:…”

Section: Introductionmentioning

confidence: 99%

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Cavitation clouds created by shock scattering from bubbles during histotripsy

Maxwell

Wang

Cain

et al. 2011

The Journal of the Acoustical Society of America

274

258

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Histotripsy is a therapy that focuses short-duration, high-amplitude pulses of ultrasound to incite a localized cavitation cloud that mechanically breaks down tissue. To investigate the mechanism of cloud formation, high-speed photography was used to observe clouds generated during single histotripsy pulses. Pulses of 5À20 cycles duration were applied to a transparent tissue phantom by a 1-MHz spherically focused transducer. Clouds initiated from single cavitation bubbles that formed during the initial cycles of the pulse, and grew along the acoustic axis opposite the propagation direction. Based on these observations, we hypothesized that clouds form as a result of large negative pressure generated by the backscattering of shockwaves from a single bubble. The positive-pressure phase of the wave inverts upon scattering and superimposes on the incident negativepressure phase to create this negative pressure and cavitation. The process repeats with each cycle of the incident wave, and the bubble cloud elongates toward the transducer. Finite-amplitude propagation distorts the incident wave such that the peak-positive pressure is much greater than the peak-negative pressure, which exaggerates the effect. The hypothesis was tested with two modified incident waves that maintained negative pressure but reduced the positive pressure amplitude. These waves suppressed cloud formation which supported the hypothesis.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cavitation clouds created by shock scattering from bubbles during histotripsy

Maxwell

Wang

Cain

et al. 2011

The Journal of the Acoustical Society of America

274

258

View full text Add to dashboard Cite

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“…Theoretical and experimental investigations of acoustic cavitation [14][15][16] reveal that the complex pattern of interaction of cavitation pockets with one another and with acoustic waves in an experimental cell may lead to the formation of bistability and to transitions between steady states. Such transitions in a cavitation cloud may be treated as a nonequilibrium phase transition in a complex system of interacting cavitation pockets and acoustic waves.…”

Section: /F Fluctuations Under Conditions Of Acoustic Cavitation Of mentioning

confidence: 99%

Fluctuations with 1/f Spectrum under Conditions of Acoustic Cavitation of Water

et al. 2005

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The results are given of an experimental investigation of fluctuations under conditions of cavitation of water in an ultrasonic field. The laser photometry and resistive methods are employed. The fluctuations of the intensity of transmitted laser radiation and the fluctuations of electrical conductivity during the passage of electric current through a weak aqueous electrolyte under conditions of ultrasonic cavitation are measured in the experiments. A mode is found which is characterized by the 1/f-behavior of power spectra and by the bimodal function of local distribution of fluctuation amplitudes. The distribution function under conditions of scale roughening of realizations is investigated. It is found that an increase in the region being probed leads to scale-invariant Gaussian distributions; this agrees with the theoretical concepts of the generation of 1/f fluctuations in the case of nonequilibrium phase transitions.

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“…The threshold range of peak negative pressure was from −26 to −30 MPa in the media with high water content. In another study, a threshold of −33 MPa was observed in water by a focused acoustic pulse, and it was considered that cavitation bubbles were originated from nanometer-sized nuclei [42]. In histotripsy, cavitation bubbles are induced by extremely high-intensity pulses with a peak-negative pressure exceeding the threshold range and a soft tissue is eroded by the collapse of the bubbles [43][44][45].…”

Section: Trigger Hifu Sequencementioning

confidence: 99%

Enhancement of High-Intensity Focused Ultrasound Heating by Short-Pulse Generated Cavitation

2017

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Abstract:A target tissue can be thermally coagulated in high-intensity focused ultrasound (HIFU) treatment noninvasively. HIFU thermal treatments have been clinically applied to various solid tumors. One of the problems in HIFU treatments is a long treatment time. Acoustically driven microbubbles can accelerate the ultrasonic heating, resulting in the significant reduction of the treatment time. In this paper, a method named "trigger HIFU exposure" which employs cavitation microbubbles is introduced and its results are reviewed. A trigger HIFU sequence consists of high-intensity short pulses followed by moderate-intensity long bursts. Cavitation bubbles induced in a multiple focal regions by rapidly scanning the focus of high-intensity pulses enhanced the temperature increase significantly and produced a large coagulation region with high efficiency.

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Two-threshold cavitation regime

Cited by 22 publications

References 4 publications

Cavitation clouds created by shock scattering from bubbles during histotripsy

Cavitation clouds created by shock scattering from bubbles during histotripsy

Fluctuations with 1/f Spectrum under Conditions of Acoustic Cavitation of Water

Enhancement of High-Intensity Focused Ultrasound Heating by Short-Pulse Generated Cavitation

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