Shear Wave Imaging Using Phase Modulation Component of Harmonic Distortion in Continuous Shear Wave Excitation

概要

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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.
2013-07-25