An elasticity imaging method using continuous shear wave excitation (CSWE) is expected to be a safe and quantitative technique. A velocity map could be produced by propagating wave number spectrum analysis of a two-dimensional (2D) displacement map of shear wave propagation. However; the problems of accuracy and resolution have limited the reliability of this technique in medical diagnosis. In this paper, we propose a shear wave imaging system for reconstructing the spatial phase modulation component of shear wave propagation in order to obtain high-resolution images of continuous shear wave excitation. Shear wave local velocity, which is derived from the spatial differentation of the phase of complex displacement, is adopted as an imaging parameter. A fine texture-like pattern of the phase modulation component appears in the local velocity map, which gives precise information of small-amplitude phase modulation.
The emerging technology of ultrasonic imaging of the soft tissue strain and elasticity, which aims at providing information about the mechanical properties of the tissues, has become a peer research issue since the 1990s. An elasticity imaging method using continuous shear wave excitation (CSWE) is expected to be a safe and quantitative technique. We have already proposed a local velocity mapping method for shear elasticity by reconstructing the small phase modulation components of the harmonic distortion in CSWE. In this paper, we propose a simple model of static hysteresis as the nonlinearity of shear elasticity. This model is based on the presence of harmonic phase modulation components in shear wave propagation. By using this model, we attempt to characterize the static hysteresis of shear elasticity. The relationship between the texture patterns of the local velocity map and the nonlinearity of the medium, which is measured by a rheometer, shows that the proposed model can be adopted for the imaging of the nonlinearity of shear elasticity.
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