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. 2018 Aug 17;9(5):791–814. doi: 10.1007/s13244-018-0642-1

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© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Basic physical principle of shear-wave elastography (SWE). A perpendicular stress force (acoustic radiation force) is applied to the tissue, which causes the generation of shear waves. The velocity of the shear wave could be measured by obtaining radiofrequency images with a high frame rate, which can be used to generate a tissue displacement map. Tissue displacements are used to calculate the shear-wave velocity (V_s) and shear modulus (G)