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In the mid-1990s a method named Shear Wave Elasticity Imaging -LRB- SWEI -RRB- for mapping tissue elasticity has been proposed .. The method is based on the use of acoustic radiation force of focused ultrasound to create shear waves in soft tissue .. acoustic radiation force. acoustic radiation force. shear waves. shear waves. By measuring shear wave propagation parameters using ultrasound or MRI the tissue elasticity map can be created .. Since the terms `` Elasticity Imaging '' and `` Elastography '' are synonyms , the original term SWEI is often changed to SWE , which commonly stands for Shear Wave Elastography .. Elastography. Elastography. The shear wave speed is governed by the shear modulus of tissue which is highly sensitive to physiological and pathological structural changes of tissue .. shear modulus. shear modulus. Variation of the shear modulus may be several orders of magnitude depending on the structure and state of tissue .. shear modulus. shear modulus. This variation of the shear wave speed increases in many tissues in the presence of disease , e.g. the cancerous tissues can be significantly stiffer than normal tissue .. For this reason , the possibility of using shear waves in new diagnostic methods and devices has been extensively investigated over the last two decades .. shear waves. shear waves