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Proceedings Paper

Modeling of higher harmonics formation in medical ultrasound systems
Author(s): Louise Kold Taylor; Malene Schlaikjer; Joergen Arendt Jensen
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Paper Abstract

The pressure field emitted from multi-element medical ultrasound transducers can be simulated with Field II in the linear regime. By expanding this program's application to the nonlinear regime, beamforming schemes can be studied under strong focusing and high pressure levels as well, providing a valuable tool for simulating ultrasound harmonic imaging. An extended version of Field II is obtained by means of operator splitting. The pressure field is calculated by propagation of the field from the transducer through a number of planes. Every plane serves as a virtual aperture for the next plane, and nonlinear distortion is accounted for by the lossless Burgers' Equation. This method has no plane-wave approximation and the full effects of diffraction, attenuation, and nonlinear wave propagation can be observed under electronic focusing of array transducers in medical ultrasound systems. A single example of the approach is demonstrated by comparing results from simulations and measurements from a convex array transducer. The new simulation tool is capable of simulating the formation of higher harmonics in water on the acoustical axis. The generation of nonlinear higher harmonic components can be predicted with an accuracy of 2.6 dB and 2.0 dB for the second and third harmonic, respectively.

Paper Details

Date Published: 11 April 2002
PDF: 9 pages
Proc. SPIE 4687, Medical Imaging 2002: Ultrasonic Imaging and Signal Processing, (11 April 2002); doi: 10.1117/12.462186
Show Author Affiliations
Louise Kold Taylor, Danmarks Tekniske Univ. and B-K Medical A/S (Denmark)
Malene Schlaikjer, Danmarks Tekniske Univ. and B-K Medical A/S (Denmark)
Joergen Arendt Jensen, Danmarks Tekniske Univ. (Denmark)

Published in SPIE Proceedings Vol. 4687:
Medical Imaging 2002: Ultrasonic Imaging and Signal Processing
Michael F. Insana; William F. Walker, Editor(s)

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