![]() To obtain SWE images of breast lesions, the rectangular field-of-view box of the system is set to include the lesion itself as well as the surrounding normal tissue in this display, the tissue stiffness of each pixel in the image is shown as a semitransparent color map overlaid on the gray-scale image. With shear waves that are induced by the acoustic radiation force and propagate transversely in the tissue, SWE can provide a semitransparent color-coded image displaying the shear wave velocity (m/sec) or elasticity (kPa) for each pixel in real time, because the speed of the shear waves can be measured and is linked to the Young modulus (kPa). In this article, the clinical applications and the current role of SWE in breast ultrasonography are reviewed. Meanwhile, SWE using the acoustic radiation force induced by the ultrasound push pulse generated by the transducer provides quantitative elasticity parameters, as well as displaying a visual color overlay of elastic information in real time. ![]() It is difficult to measure the amount of the force or stress during compression, and the absolute elasticity cannot be calculated. Strain elastography produces an image based on the relative displacement of the tissue from an external (manual compression of the transducer) or patient source. In breast ultrasonography, two elastographic techniques are popular and differ in the type of stress applied: strain and shear-wave elastography (SWE). Unlike a physical examination, which allows only the subjective judgment of the stiffness of a lesion, elastography has the potential to quantify stiffness. Elastography is an imaging modality based on tissue stiffness or hardness, which is analogous to clinical palpation with ultrasonography for a malignancy.
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