Abstract
This study presents the observation of elastic shear waves generated in soft solids using a dynamic electromagnetic field. The first and second experiments of this study show that Lorentz force can induce a displacement in a soft phantom and that this displacement is detectable by an ultrasound scanner using speckle-tracking algorithms. For a 100 mT magnetic field and a 10 ms, 100 mA peak-to-peak electrical burst, the displacement reached a magnitude of 1 m. In the third experiment, we show that Lorentz force can induce shear waves in a phantom. A physical model using electromagnetic and elasticity equations is proposed and computer simulations are in good agreement with experimental results. The shear waves induced by Lorentz force are used in the last experiment to estimate the elasticity of a swine liver sample.
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