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Voronin, D. V.; Sankin, G. N.; Teslenko, V. S.; Mettin, Robert; Lauterborn, Werner

doi:10.1023/a:1021717427235

Cited by 11 publications

(3 citation statements)

References 7 publications

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“…These effects are reminiscent of acoustic radiation amassment from inertial cavitation near to a FOPH fiber tip observed in previous studies implementing seeded bubbles, tap water, and/or strong |P -| (>40 MPa). 24,26,[34][35][36] High-speed imaging in Fig. 5(a) suggests that cavitating bubbles formed in a thin layer beneath the light spot may likewise alter the measured 14,31 Filter applied to individual photovoltage measurements prior to pressure calibration and averaging.…”

Section: A Pressure Waveforms At Geometric Focus Of the Shock Sourcementioning

confidence: 99%

A comparison of light spot hydrophone and fiber optic probe hydrophone for lithotripter field characterization

Smith

Sankin

Simmons

et al. 2012

Review of Scientific Instruments

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The performance of a newly developed light spot hydrophone (LSHD) in lithotripter field characterization was compared to that of the fiber optic probe hydrophone (FOPH). Pressure waveforms produced by a stable electromagnetic shock wave source were measured by the LSHD and FOPH under identical experimental conditions. In the low energy regime, focus and field acoustic parameters matched well between the two hydrophones. At clinically relevant high energy settings for shock wave lithotripsy, the measured leading compressive pressure waveforms matched closely with each other. However, the LSHD recorded slightly larger |P_| (p< 0.05) and secondary peak compressive pressures (p < 0.01) than the FOPH, leading to about 20% increase in total acoustic pulse energy calculated in a 6 mm radius around the focus (p = 0.06). Tensile pulse durations deviated ~5% (p < 0.01) due to tensile wave shortening from cavitation activity using the LSHD. Intermittent compression spikes and laser light reflection artifacts have been correlated to bubble activity based on simultaneous high-speed imaging analysis. Altogether, both hydrophones are adequate for lithotripter field characterization as specified by the international standard IEC 61846.

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Section: A Pressure Waveforms At Geometric Focus Of the Shock Sourcementioning

confidence: 99%

A comparison of light spot hydrophone and fiber optic probe hydrophone for lithotripter field characterization

Smith

Sankin

Simmons

et al. 2012

Review of Scientific Instruments

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“…More importantly, bubbles produced in the coupling cushion of a lithotripter will selectively transmit the leading compressive component of the LSW while truncating its trailing tensile component (Voronin et al 2003, Pishchalnikov et al 2005. Cavitation in the coupling fluid consumes part of the incident shock wave energy, especially the tensile component, and thus greatly reduces cavitation in the focal region surrounding the stone, which is known to be critical for producing fine fragments (Zhu et al 2002, Sapozhnikov et al 2007.…”

Section: Introductionmentioning

confidence: 99%

Turbulent water coupling in shock wave lithotripsy

2013

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Previous studies have demonstrated that stone comminution decreases with increased pulse repetition frequency as a result of bubble proliferation in the cavitation field of a shock wave lithotripter (Pishchalnikov et al., 2011). If cavitation nuclei remain in the propagation path of successive lithotripter pulses, especially in the acoustic coupling cushion of the shock wave source, they will consume part of the incident wave energy, leading to reduced tensile pressure in the focal region and thus lower stone comminution efficiency. We introduce a method to remove cavitation nuclei from the coupling cushion between successive shock exposures using a jet of degassed water. As a result, pre-focal bubble nuclei lifetime quantified by B-mode ultrasound imaging was reduced from 7 s to 0.3 s by a jet with an exit velocity of 62 cm/s. Stone fragmentation (percent mass < 2 mm) after 250 shocks delivered at 1 Hz was enhanced from 22 ± 6% to 33 ± 5% (p = 0.007) in water without interposing tissue mimicking materials. Stone fragmentation after 500 shocks delivered at 2 Hz was increased from 18 ± 6% to 28 ± 8% (p = 0.04) with an interposing tissue phantom of 8 cm thick. These results demonstrate the critical influence of cavitation bubbles in the coupling cushion on stone comminution and suggest a potential strategy to improve the efficacy of contemporary shock wave lithotripters.

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“…The problem was solved numerically with the use of the method of individual particles (detailed mathematical formulation of the problem and the method of the solution could be seen in paper [3]), that is an improvement of Harlow method of particles in cells. Non-stationary fields of the basic thermodynamic parameters have been calculated both inside everyone bubble, and in external for them liquid flow.…”

Section: Modelingmentioning

confidence: 99%

Cavitations Development In a Liquid Behind Strong Acoustic Waves

Voronin¹,

Teslenko²

2008

AIP Conference Proceedings

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Inertial cavitation and associated acoustic emission produced during electrohydraulic shock wave lithotripsy Abstract. The generation of bubbles behind an acoustic pulse is theoretically and experimentally investigated in the paper. It was found out that at growth of the amplitude of falling wave two different modes of cavitations development occur: "chain" mechanism of duplication of cavitations germs is replaced by mechanism of "real" liquid cavitations, when the liquid is initially filled with a set of cavitations nuclei and apparent bubble occurrence is caused by different periods of nucleus growth from them.

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Untitled

Cited by 11 publications

References 7 publications

A comparison of light spot hydrophone and fiber optic probe hydrophone for lithotripter field characterization

A comparison of light spot hydrophone and fiber optic probe hydrophone for lithotripter field characterization

Turbulent water coupling in shock wave lithotripsy

Cavitations Development In a Liquid Behind Strong Acoustic Waves

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