Fig. 11
From: A review of various modalities in breast imaging: technical aspects and clinical outcomes
The ultrasounds are successively focused at different depths to create pushes by radiation pressure. (1) The constructive interferences of the shear waves form a supersonic Mach cone (in which the speed of the source is greater than the speed of the generated wave) and a quasi-plane shear wave is created; (2) the ultrasound machine then switch into an ultrafast imaging mode to follow the shear wave that is propagating through the medium [31]