Fig. 2

In vitro experiment: Dual-layer tissue phantom investigated using externally-induced shear waves. a: By using a clinical shear wave elastography system (scanner 2), color elastograms were generated (b); c: Regional stiffness quantification in the two layers, translated into shear wave velocity. The Q-boxes are manually placed in the middle of the layer-specific region; d: The same phantom imaged with a clinical high frame rate TDI system (scanner 1). Shear waves were induced by acoustic radiation force using a dedicated research system (V). e: a propagation difference is visible in the two layers. Because of the gain settings needed in the clinical system TDI, the interlayer separation is barely visible, and was marked with a dashed line; f: by computing the shear wave velocity along two M-mode lines, the values come very close to the expected shear wave velocities