Quasi-static electrode displacement elastography, used for in-vivo imaging of radiofrequency
ablation-induced lesions in abdominal organs such as the liver and kidney, is extended
in this paper to dynamic vibrational perturbations of the ablation electrode. Propagation
of the resulting shear waves into adjoining regions of tissue can be tracked and the
shear wave velocity used to quantify the shear (and thereby Young's) modulus of tissue.
The algorithm used utilizes the time-to-peak displacement data (obtained from finite
element analyses) to calculate the speed of shear wave propagation in the material.
The simulation results presented illustrate the feasibility of estimating the Young's
modulus of tissue and is promising for characterizing the stiffness of radiofrequency-ablated
thermal lesions and surrounding normal tissue.