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Author Rosnitskiy, P. ♦ Yuldashev, P. ♦ Khokhlova, V.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ENGINEERING ♦ AMPLITUDES ♦ ANALYTICAL SOLUTION ♦ APERTURES ♦ APPROXIMATIONS ♦ BOUNDARY CONDITIONS ♦ DIFFRACTION MODELS ♦ DISTANCE ♦ EQUATIONS ♦ NONLINEAR PROBLEMS ♦ RAYLEIGH NUMBER ♦ SIMULATION ♦ SPHERICAL CONFIGURATION ♦ SURFACES ♦ TRANSDUCERS ♦ ULTRASONIC WAVES
Abstract An equivalent source model was proposed as a boundary condition to the nonlinear parabolic Khokhlov-Zabolotskaya (KZ) equation to simulate high intensity focused ultrasound (HIFU) fields generated by medical ultrasound transducers with the shape of a spherical shell. The boundary condition was set in the initial plane; the aperture, the focal distance, and the initial pressure of the source were chosen based on the best match of the axial pressure amplitude and phase distributions in the Rayleigh integral analytic solution for a spherical transducer and the linear parabolic approximation solution for the equivalent source. Analytic expressions for the equivalent source parameters were derived. It was shown that the proposed approach allowed us to transfer the boundary condition from the spherical surface to the plane and to achieve a very good match between the linear field solutions of the parabolic and full diffraction models even for highly focused sources with F-number less than unity. The proposed method can be further used to expand the capabilities of the KZ nonlinear parabolic equation for efficient modeling of HIFU fields generated by strongly focused sources.
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-10-28
Publisher Place United States
Volume Number 1685
Issue Number 1


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