A Priori Modeling of the Acoustic Boundary Layer Effect on the Heat Source in Ultrasound

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概要

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• A reduced-order model is proposed to provide effective boundary conditions accounting for a vortical fluid velocity confined in an Acoustic Boundary Layer (ABL) around a linear elastic solid object subjected to an ultrasound wave. It is validated by <I>a priori</I> tests of two-dimensional acoustic scatterings by a cylinder with material properties of water and bone. The viscous dissipation resulting in a heating predicted by the proposed model is in excellent agreement with that of the full model, in which the P- and S-waves in fluid are faithfully captured. The frictional heat source per area in the ABL is confirmed to be <I>O</I>(10<SUP>4</SUP>) higher than that in the bulk, suggesting the significance of the ABL effect in estimating overheating risks in HIFU (High Intensity Focused Ultrasound) therapy.

著者

• OKITA Kohei

  Department of Internal Medicine and Molecular Science, Graduate School of Medicine, Osaka University

• Matsumoto Yoichiro

  Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• Takagi Shu

  Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• OKITA Kohei

  Department of Mechanical Engineering, College of Industrial Technology, Nihon University

• II Satoshi

  Department of Mechanical Engineering, School of Engineering, The University of Tokyo

• SUGIYAMA Kazuyasu

  Department of Mechanical Engineering, The University of Tokyo

• MATSUMOTO Yoichiro

  Department of Mechanical Engineering, School of Engineering, The University of Tokyo

• SUGIYAMA Kazuyasu

  Department of Mechanical Engineering, School of Engineering, The University of Tokyo

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