Modeling of higher harmonics formation in medical ultrasound systems

Louise Kold Taylor; Malene Schlaikjer; Joergen Arendt Jensen

doi:10.1117/12.462186

11 April 2002 Modeling of higher harmonics formation in medical ultrasound systems

Louise Kold Taylor, Malene Schlaikjer, Joergen Arendt Jensen

Proceedings Volume 4687, Medical Imaging 2002: Ultrasonic Imaging and Signal Processing; (2002) https://doi.org/10.1117/12.462186
Event: Medical Imaging 2002, 2002, San Diego, California, United States

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.

Citation Download Citation

Louise Kold Taylor, Malene Schlaikjer, and Joergen Arendt Jensen "Modeling of higher harmonics formation in medical ultrasound systems", Proc. SPIE 4687, Medical Imaging 2002: Ultrasonic Imaging and Signal Processing, (11 April 2002); https://doi.org/10.1117/12.462186

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