Ultrasonic elastography simulation method based on multi-physical field coupling

Abstract

The invention relates to an ultrasonic elastography simulation method based on multi-physical field coupling. The method comprises the following steps: performing coupling simulation on a sound fieldand a solid mechanical field in Comsol Multiphysics simulation software; firstly, completing simulation of a sound field by utilizing an acoustic module; extracting a radio frequency echo signal RF1;calculating acoustic radiation force according to acoustic characteristic parameters in the sound field simulation solving result, applying the acoustic radiation force to the solid mechanical field to obtain responses such as displacement generated when the acoustic radiation force acts on the medium, analyzing information such as displacement and shear wave velocity of the solid mechanical field, and completing positive problem simulation of the ultrasonic elastography method; and re-applying the geometry which generates deformation to an acoustic module for solving to obtain another group of radio frequency echo signals RF2 after the measured object field generates deformation, and using the two groups of echo signals for solving the inverse problem.

Description

technical field [0001] The invention belongs to the technical field of ultrasound elastography, and relates to the simulation of an ultrasound elastography method based on acoustic radiation force excitation by using the coupling of an acoustic field and a solid mechanical field, in particular to an ultrasound elastography simulation method based on multi-physics field coupling. Background technique [0002] During the propagation of ultrasonic waves, the effects of absorption, scattering and reflection lead to changes in energy density, which in turn produces acoustic radiation force (ARF). Acoustic radiation force acts on the medium with elastic properties, resulting in axial compression and stretching and transverse shearing strain. By calculating the axial displacement, or monitoring the propagation of shear waves, the elastic properties of the measured medium are evaluated and the elastic distribution of the medium is reconstructed. In recent years, the ultrasonic elas...

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Problems solved by technology

Since the ultrasonic elastography method based on ARF excitation is a multi-physics field coupling method, the interaction between the sound field and the solid mechanical field is required during the simulation, which increases the complexity of the simulation

The previous simulation method used two different toolkits, and the data of one toolkit was input into another software. The simulation process was cumbersome, and it would bring certain model errors and compatibility issues. In addition, the acoustic simulation The ARF distribution needs to be discretized and then applied to the finite element simulation software with a specific grid. Grids with different subdivision levels have a great impact on the accuracy of the simulation and the time for solving the simulation.

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