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Investigation of the Energy Shielding of Kidney Stones by Cavitation Bubble Clouds during Burst Wave Lithotripsy

Maeda, Kazuki and Maxwell, Adam D. and Kreider, Wayne and Colonius, Tim and Bailey, Michael R. (2018) Investigation of the Energy Shielding of Kidney Stones by Cavitation Bubble Clouds during Burst Wave Lithotripsy. In: Proceedings of the 10th Symposium on Cavitation (CAV2018). American Society of Mechanical Engineers , New York, NY, pp. 626-630. ISBN 9780791861851.

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We conduct experiments and numerical simulations of the dynamics of bubble clouds nucleated on the surface of an epoxy cylindrical stone model during burst wave lithotripsy (BWL). In the experiment, the bubble clouds are visualized and bubble-scattered acoustics are measured. In the numerical simulation, we combine methods for modeling compressible multicomponent flows to capture complex interactions among cavitation bubbles, the stone, and the burst wave. Quantitative agreement is confirmed between results of the experiment and the simulation. We observe and quantify a significant shielding of incident wave energy by the bubble clouds. The magnitude of shielding reaches up to 80% of the total acoustic energy of the incoming burst wave, suggesting a potential loss of efficacy of stone comminution. We further discovered a strong linear correlation between the magnitude of the energy shielding and the amplitude of the bubble-scattered acoustics, independent of the initial size and the void fraction of bubble cloud within a range addressed in the simulation. This correlation could provide for real-time monitoring of cavitation activity in BWL.

Item Type:Book Section
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URLURL TypeDescription
Maeda, Kazuki0000-0002-5729-6194
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2018 The American Society of Mechanical Engineers. K.M would like to acknowledge the Funai Foundation for Information Technology, for the Overseas Scholarship. This work was supported by the National Institutes of Health under grants P01-DK043881 and K01-DK104854. The simulations presented here utilized the Extreme Science and Engineering Discovery Environment, which is supported by the National Science Foundation grant number CTS120005.
Funding AgencyGrant Number
Funai Foundation for Information TechnologyUNSPECIFIED
Subject Keywords:Cloud cavitation; lithotripsy; numerical simulation; high-speed imaging; acoustic imaging
Record Number:CaltechAUTHORS:20190709-092102914
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Official Citation:Maeda, Kazuki, , Maxwell, Adam D, , Kreider, Wayne, , Colonius, Tim, , Bailey, Michael R,, 2018. "Investigation of the Energy Shielding of Kidney Stones by Cavitation Bubble Clouds during Burst Wave Lithotripsy," Proceedings of the 10th International Symposium on Cavitation (CAV2018), Joseph Katz, ASME, New York, 5 pp.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96986
Deposited By: Melissa Ray
Deposited On:10 Jul 2019 23:25
Last Modified:09 Mar 2020 13:18

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