  This study presents the first observation of elastic shear waves generated in
soft solids using a dynamic electromagnetic field. The first and second
experiments of this 5 study showed that Lorentz force can induce a displacement
in a soft phantom and that this displacement was 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 um. In the third experiment, we showed that Lorentz force can induce shear
waves in a phantom. A physical model 10 using electromagnetic and elasticity
equations was proposed. Computer simulations were in good agreement with
experimental results. The shear waves induced by Lorentz force were used in the
last experiment to estimate the elasticity of a swine liver sample.
