What is a shear wave elastography?
Shear wave elastography (SWE) is a new technique that estimates tissue stiffness in real time and is quantitative and user independent. Objectives: The aim of the study was to assess the efficiency of SWE in predicting malignancy and to compare SWE with US.
What is a shear wave physics?
Shear wave, transverse wave that occurs in an elastic medium when it is subjected to periodic shear. Shear is the change of shape, without change of volume, of a layer of the substance, produced by a pair of equal forces acting in opposite directions along the two faces of the layer.
What is elastography used for?
Elastography is a non-invasive medical imaging technique that helps determine the stiffness of organs and other structures in your body. It is most commonly used to assess your liver. Elastography directs painless low frequency vibrations into the liver.
Why is it called shear waves?
S-Waves. Secondary , or S waves, travel slower than P waves and are also called “shear” waves because they don’t change the volume of the material through which they propagate, they shear it. As a transverse wave passes the ground perpendicular to the direction that the wave is propagating. S-waves are transverse waves …
Why S waves has a bigger wave?
S-waves cannot travel through liquids or gases. Because the earth’s mantle becomes more rigid as its depth below the asthenosphere increases, S-waves travel faster as they go deeper in the mantle….S-Waves.
S-waves travel through materials with rigidity and density | |
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greater density | slower S-waves |
What are the applications of shear wave elastography?
Shear-Wave Elastography: Basic Physics and Musculoskeletal Applications In the past 2 decades, sonoelastography has been progressively used as a tool to help evaluate soft-tissue elasticity and add to information obtained with conventional gray-scale and Doppler ultrasonographic techniques.
How are shear waves similar to strain waves?
Shear wave elastography. The concept is similar to strain elastography, but instead of using transducer pressure to compare a shift in an ultrasound A-line (thereby measuring changes in strain), a higher intensity pulse is transmitted to produce shear waves, which extend laterally from the insonated structure.
When does shear occur in an elastic medium?
Shear wave, transverse wave that occurs in an elastic medium when it is subjected to periodic shear.
How are shear wave velocities related to elastic properties?
The distribution of shear-wave velocities at each pixel is directly related to the shear modulus, an absolute measure of the tissue’s elastic properties. Shear-wave images are automatically coregistered with standard B-mode images to provide quantitative color elastograms with anatomic specificity.