A non-invasive technique in which the elasticity of soft tissue is assessed–usually by ultrasonography–during application of mechanical compression or vibration.

Because cancer is 5 to 28 times stiffer than normal surrounding soft tissue, strain images of tissues with cancer have been used to detect and classify tumours. The technique may, in the future, be used to improve diagnostic accuracy and provide surgical guidance. 

Synonym Elasticity imaging 

Reference http://en.wikipedia.org/wiki/Elastography 

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