Editing Elastography (section)

===Processing and presentation===
Once the response has been observed, the stiffness can be calculated from it. Most elastography techniques find the stiffness of tissue based on one of two main principles:
* For a given applied force ([[stress (mechanics)|stress]]), stiffer tissue deforms ([[deformation (mechanics)#Strain|strain]]s) less than does softer tissue.
* Mechanical waves (specifically [[S-wave|shear wave]]s) travel faster through stiffer tissue than through softer tissue.
Some techniques will simply display the distortion and/or response, or the wave speed to the operator, while others will compute the stiffness (specifically the [[Young's modulus]] or similar [[shear modulus]]) and display that instead. Some techniques present results quantitatively, while others only present qualitative (relative) results.