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In vivo simulation of shock wave lithotripsy: Wave focusing in inhomogeneous materials

Krimmel, Jeffrey and Colonius, Tim (2009) In vivo simulation of shock wave lithotripsy: Wave focusing in inhomogeneous materials. In: 157th Meeting of the Acoustical Society of America, 18–22 May 2009, Portland, OR.

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Shock wave generation and focusing in electrohydraulic, electromagnetic, and piezoelectric lithotripters are simulated numerically. Inhomogeneities associated with wave propagation in vivo are modeled using data from The Visible Human Project. The approximate time‐domain relaxation model of Yang and Cleveland (2005) was used to simulate attenuation and dispersion in the tissuelike media. The simulations utilize a MUSCL‐type shock capturing scheme with adaptive mesh refinement (AMR). In vitro focal region pressure measurements compare favorably with available experimental data for each lithotripter type. Preliminary in vivo simulation results show significant dispersion associated with the nonuniform sound speed, including increases of up to 50% in focal pressure amplitudes and the presence of multiple pressure minima/maxima in the focal waveform. We will also discuss the extension of the AMR framework to account for cavitation via a previously developed ensemble‐averaged continuous two‐phase flow model.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Program
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2009 Acoustical Society of America. Published Online: 08 April 2009.
Subject Keywords:Multiphase flows; Piezoelectricity; Wave propagation; Shock waves; Speed of sound; Adaptive mesh refinement; Medical diagnosis
Record Number:CaltechAUTHORS:20190717-102318035
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97193
Deposited By: Melissa Ray
Deposited On:17 Jul 2019 19:18
Last Modified:16 Nov 2021 17:29

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