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. 2024 Jan 17;57(2):164–174. doi: 10.5946/ce.2023.074

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© 2024 Korean Society of Gastrointestinal Endoscopy

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 3. — Principle of EUS shear-wave measurement and a EUS-SWE monitor image. Acoustic radiation force (push pulse) is sent to the pertinent point of the region of interest (ROI), and the push pulse generates a shear wave at the edge. The shear-wave velocity (distance/arrival time lag [Vs, m/s]) between two search points is calculated with a track pulse. If the tissue is harder, the shear wave propagates faster. EUS, endoscopic ultrasonography; EUS-SWE, EUS shear-wave elastography; Vs, shear-wave velocity; E = 3(Vs2ρ) (ρ is the tissue density); VsN, the percentage of the net amount of effective shear-wave velocity.