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  • Comparative Studies. Non-European Languages/Literatures  (68)
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  • Comparative Studies. Non-European Languages/Literatures  (68)
RVK
  • 1
    Online Resource
    Online Resource
    Shock-wave–inertial-bubble interaction near an elastic boundary
    Acoustical Society of America (ASA) ; 2006
    In:  The Journal of the Acoustical Society of America Vol. 120, No. 5_Supplement ( 2006-11-01), p. 3201-3201
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 120, No. 5_Supplement ( 2006-11-01), p. 3201-3201
    Abstract: The interaction of laser-generated single cavitation bubbles (maximum diameter Dmax=1.34 mm) near a silicon rubber membrane with a shock wave (39–75 MPa in peak pressure and 1.7 μs in compressive pulse duration) is investigated. The interaction leads to directional, forced collapse of the bubble with microjet formation along shock wave propagation direction. Maximum jet penetration into the membrane is produced during the bubble collapse phase with optimal shock wave arrival time and stand-off distance s, a condition that ensures that the forced collapse time of the bubble matches with the compressive duration of the shock wave to generate presumably the maximum axial jet velocity toward the boundary. A maximum penetration depth of 0.5 mm is observed at dimensionless proximity γ (=2s/Dmax)=0.7 when the bubble establishes contact with the boundary during expansion. At larger γ (≥1.2), jet impact is significantly attenuated by the interposing water layer separating the collapsing bubble and the membrane surface. Such interaction may provide a novel acoustic means for in vivo microinjection, applicable to targeted delivery of macromolecules and gene vectors to biological tissues.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4788083
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2006
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  • 2
    Online Resource
    Online Resource
    The effect of reflector geometry on the acoustic field and bubble dynamics produced by an electrohydraulic shock wave lithotripter
    Acoustical Society of America (ASA) ; 2006
    In:  The Journal of the Acoustical Society of America Vol. 119, No. 6 ( 2006-06-01), p. 3625-3636
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 119, No. 6 ( 2006-06-01), p. 3625-3636
    Abstract: A theoretical model for the propagation of shock wave from an axisymmetric reflector was developed by modifying the initial conditions for the conventional solution of a nonlinear parabolic wave equation (i.e., the Khokhlov–Zabolotskaya–Kuznestsov equation). The ellipsoidal reflector of an HM-3 lithotripter is modeled equivalently as a self-focusing spherically distributed pressure source. The pressure wave form generated by the spark discharge of the HM-3 electrode was measured by a fiber optic probe hydrophone and used as source conditions in the numerical calculation. The simulated pressure wave forms, accounting for the effects of diffraction, nonlinearity, and thermoviscous absorption in wave propagation and focusing, were compared with the measured results and a reasonably good agreement was found. Furthermore, the primary characteristics in the pressure wave forms produced by different reflector geometries, such as that produced by a reflector insert, can also be predicted by this model. It is interesting to note that when the interpulse delay time calculated by linear geometric model is less than about 1.5μs, two pulses from the reflector insert and the uncovered bottom of the original HM-3 reflector will merge together. Coupling the simulated pressure wave form with the Gilmore model was carried out to evaluate the effect of reflector geometry on resultant bubble dynamics in a lithotripter field. Altogether, the equivalent reflector model was found to provide a useful tool for the prediction of pressure wave form generated in a lithotripter field. This model may be used to guide the design optimization of reflector geometries for improving the performance and safety of clinical lithotripters.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2195074
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2006
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  • 3
    Online Resource
    Online Resource
    Dynamic photoelastic study of the transient stress field in solids during shock wave lithotripsy
    Acoustical Society of America (ASA) ; 2001
    In:  The Journal of the Acoustical Society of America Vol. 109, No. 3 ( 2001-03-01), p. 1226-1239
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 109, No. 3 ( 2001-03-01), p. 1226-1239
    Abstract: Photoelastic and shadowgraph imaging techniques were used to visualize the propagation and evolution of stress waves, and the resultant transient stress fields in solids during shock wave lithotripsy. In parallel, theoretical analysis of the wavefront evolution inside the solids was performed using a ray-tracing method. Excellent agreement between the theoretical prediction and experimental results was observed. Both the sample size and geometry were found to have a significant influence on the wave evolution and associated stress field produced inside the solid. In particular, characteristic patterns of spalling damage (i.e., transverse and longitudinal crack formation) were observed using plaster-of-Paris cylindrical phantoms of rectangular and circular cross sections. It was found that the leading tensile pulse of the reflected longitudinal wave is responsible for the initiation of microcracks in regions inside the phantom where high tensile stresses are produced. In addition, the transmitted shear wave was found to play a critical role in facilitating the extension and propagation of the microcrack.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.1349183
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2001
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  • 4
    Online Resource
    Online Resource
    Suppression of large intraluminal bubble expansion in shock wave lithotripsy without compromising stone comminution: Refinement of reflector geometry
    Acoustical Society of America (ASA) ; 2003
    In:  The Journal of the Acoustical Society of America Vol. 113, No. 1 ( 2003-01-01), p. 586-597
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 113, No. 1 ( 2003-01-01), p. 586-597
    Abstract: Using the Hamilton model [Hamilton, J. Acoust. Soc. Am. 93, 1256–1266 (1993)], the effects of reflector geometry on the pulse profile and sequence of the shock waves produced by the original and upgraded reflector of an HM-3 lithotripter were evaluated qualitatively. Guided by this analysis, we have refined the geometry of the upgraded reflector to enhance its suppressive effect on intraluminal bubble expansion without compromising stone comminution in shock wave lithotripsy. Using the original HM-3 reflector at 20 kV, rupture of a standard vessel phantom made of cellulose hollow fiber (i.d.=0.2 mm), in which degassed water seeded with ultrasound contrast agents was circulated, was produced at the lithotripter focus after about 30 shocks. In contrast, using the upgraded reflector at 24 kV no rupture of the vessel phantom could be produced within a 20-mm diameter around the lithotripter focus even after 200 shocks. On the other hand, stone comminution was comparable between the two reflector configurations, although slightly larger fragments were produced by the upgraded reflector. After 2000 shocks, stone comminution efficiency produced by the original HM-3 reflector at 20 kV is 97.15±1.92% (mean±SD), compared to 90.35±1.96% produced by the upgraded reflector at 24 kV (p & lt;0.02). All together, it was found that the upgraded reflector could significantly reduce the propensity for vessel rupture in shock wave lithotripsy while maintaining satisfactory stone comminution.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.1528174
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2003
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  • 5
    Online Resource
    Online Resource
    Shock wave–inertial microbubble interaction: A theoretical study based on the Gilmore formulation for bubble dynamics
    Acoustical Society of America (ASA) ; 1999
    In:  The Journal of the Acoustical Society of America Vol. 106, No. 5 ( 1999-11-01), p. 3024-3033
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 106, No. 5 ( 1999-11-01), p. 3024-3033
    Abstract: The Gilmore formulation for bubble dynamics coupled with zeroth-order gas diffusion were used to investigate theoretically the cavitation activity produced by a modified XL-1 lithotripter [J. Acoust. Soc. Am. 105, 1997–2009 (1999)]. The model calculation confirms many of the basic features in bubble dynamics observed experimentally, in particular the strong secondary shock wave emission generated by in situ lithotripter shock wave–inertial microbubble interaction. In addition, shock wave–inertial microbubble interaction produced by a Dornier HM-3, the most commonly used clinical lithotripter, was evaluated. It was shown that the forced collapse of inertial microbubbles with strong secondary shock wave emission could be produced consistently, provided that an appropriate preceding shock wave and interpulse delay were used. Further, it was demonstrated that truncation of the tensile stress of the lithotripter shock wave could significantly reduce the large expansion of the bubble following shock wave-inertial microbubble interaction, which may alleviate the risk for vascular injury during shock wave exposure.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.428122
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1999
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  • 6
    Online Resource
    Online Resource
    BegoStone—a new stone phantom for shock wave lithotripsy research (L)
    Acoustical Society of America (ASA) ; 2002
    In:  The Journal of the Acoustical Society of America Vol. 112, No. 4 ( 2002-10-01), p. 1265-1268
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 112, No. 4 ( 2002-10-01), p. 1265-1268
    Abstract: BegoStone, a commercially available super-hard plaster originally developed for dental applications, was examined as a potential stone phantom material for shock wave lithotripsy (SWL) research. The physical properties of BegoStone were characterized by using an ultrasound pulse transmission method and a microhardness tester with a Vickers indenter. In addition, spherical BegoStone phantoms (D=10 mm) were fabricated and exposed to 25–500 shocks at the beam focus of an HM-3 lithotripter operated at 20 kV and 1-Hz pulse repetition rate. It was found that the physical properties of BegoStone are comparable to that of hard kidney stones such as calcium oxalate monohydrate stones. In comparison to the widely use stone phantoms made of plaster-of-Paris, BegoStone is much denser and harder, and more difficult to fragment in SWL. Yet, both types of stone phantoms comminute progressively in SWL. In addition, BegoStone is abrasion resistant and does not soften in urine. Therefore, BegoStone may provide a reliable and consistent phantom material for both in vitro and in vivo studies of stone comminution in SWL.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.1501905
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2002
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  • 7
    Online Resource
    Online Resource
    Time-resolved passive cavitation mapping using the transient angular spectrum approach
    Acoustical Society of America (ASA) ; 2023
    In:  The Journal of the Acoustical Society of America Vol. 153, No. 3_supplement ( 2023-03-01), p. A268-A268
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 153, No. 3_supplement ( 2023-03-01), p. A268-A268
    Abstract: Passive cavitation mapping (PCM), which generates images using bubble acoustic emission signals, has been increasingly used for monitoring and guiding focused ultrasound surgery. This study investigates a transient angular spectrum (AS) approach for PCM. The working principle of this approach is to backpropagate the received signal to the domain of interest and reconstruct the spatial–temporal wavefield encoded with the bubble location and collapse time. The transient AS approach is validated using an in silico model, water bath, and in vivo experiments. It is found that the transient AS approach yields similar results to delay and sum, but is considerably faster. The results obtained by this study suggest that the transient AS approach is promising for fast and accurate PCM.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0018806
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2023
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  • 8
    Online Resource
    Online Resource
    Effects of an acoustic diode on lithotripter shock wave, cavitation, and stone fragmentation
    Acoustical Society of America (ASA) ; 2002
    In:  The Journal of the Acoustical Society of America Vol. 111, No. 5_Supplement ( 2002-05-01), p. 2461-2461
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 111, No. 5_Supplement ( 2002-05-01), p. 2461-2461
    Abstract: Recent studies suggest that reducing the large intraluminal bubble expansion in small blood vessels may ameliorate the potential for vascular injury in shock wave lithotripsy. To achieve this objective without compromising stone comminution, a selective truncation of the tensile component of lithotripter shock wave (LSW) is needed. In this work, an acoustic diode (AD) of Riedlinger’s design was constructed and evaluated. The AD consists of two peripherally secured membranes having opposite surfaces held in direct contact under partial vacuum. The AD permits transmission of the leading compressive component of a LSW; yet the membranes may separate under tension, thus blocking the transmission of the trailing tensile component of the LSW. Following each LSW, the membranes will again establish direct contact due to the partial vacuum between them. Using the AD at a vacuum level of 10.75 in. & lt;th & gt;Hg, the collapse time of the LSW-induced bubble cluster at the beam focus of a HM-3 lithotripter at 20 kV was found to be reduced by 29%, whereas the compressive pressure and stone comminution were only reduced slightly by 4% and 5%, respectively. Thus the AD may be used to reduce tissue injury produced by LSW. [Work supported by Whitaker Foundation and NIH.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4809137
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2002
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  • 9
    Online Resource
    Online Resource
    Dynamics and flow field produced by coupled oscillation of tandem microbubble.
    Acoustical Society of America (ASA) ; 2010
    In:  The Journal of the Acoustical Society of America Vol. 127, No. 3_Supplement ( 2010-03-01), p. 1941-1941
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 127, No. 3_Supplement ( 2010-03-01), p. 1941-1941
    Abstract: Coupled oscillations of two adjacent laser-induced microbubbles have been shown to produce unique asymmetric bubble deformation and microjet formation. The resultant microstreaming and shear stress can cause localized cell membrane poration with potential application in targeted drug and gene delivery. In this study, we investigate the bubble dynamics and flow field produced by laser-generated tandem microbubble in a microfluidic device. Flow field around the tandem microbubble is analyzed with respect to phase delay, inter-bubble distance, and size ratio between the two microbubbles. In addition, micropatterning technique is used to control the adhesion site and growth pattern of HeLa cells in relation to the tandem microbubble. Flow vorticity is observed to be a key parameter that correlates with the strength of tandem microbubble oscillation and resultant macromolecule uptake efficiency. [Work supported by NIH Grant Nos. R01DK052985, R21CA135221, and S10RR016802].
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3384894
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2010
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  • 10
    Online Resource
    Online Resource
    Assessing the effect of lithotripter focal width on the fracture potential of stones in shockwave lithotripsy
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 141, No. 5_Supplement ( 2017-05-01), p. 3718-3718
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 141, No. 5_Supplement ( 2017-05-01), p. 3718-3718
    Abstract: This talk presents a combination of computational and experimental study on the effect of lithotripter focal width on the fracture potential of stones treated at various distances from the lithotripter focus. Two representative lithotripter fields are considered: (1) the original Siemens Modularis with a focal width of 7.4 mm and (2) a modified version with a larger focal width of 11.0 mm with comparable acoustic pulse energy of 40 mJ. The interaction of these two lithotripter fields with spherical and cylindrical model stones located at 0 to 12 mm from the shock wave axis is investigated. Specifically, a three-dimensional CFD (Computational Fluid Dynamics)—CSD (Computational Solid Dynamics) coupled computational framework is used to simulate the propagation of stress waves, as well as the initiation and propagation of fractures. The two-scale Tuler-Butcher fracture criterion will be employed: it will be calibrated experimentally, then applied to assessing stress-induced stone damage. An element deletion method will be applied to simulate fracture. Characteristic changes in wave focusing and interference in relation to the buildup of the maximum tensile stress inside the stone will be presented. The physical mechanism(s) responsible for the different fracture patterns observed at different off-axis distances will be discussed.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4988139
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2017
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