Young's modulus

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Young's modulus is a relationship between elasticity, strain, and stress:

  • elasticity x (change in length / original length) = (force / area)

put another way, this is

  • elasticity x (strain) = stress

or

  • elasticity = stress / strain

Elasticity is measured in kilopascals (kPa).

This relationship is fundamental to strain elastography and shear wave elastography.

The Young's modulus can be calculated as

Young's modulus, E = 3 x tissue density x (shear wave velocity)