<qa>  What is the first elastography method that appeared?Elastography is an imaging method which estimates tissue elasticity. The first elastography method which appeared was Transient Elastography TE, followed by Real Time Elastography RT-E and Acoustic Radiation Force Impulse ARFI. TE was a method especially developed for noninvasive assessment of liver fibrosis as an alternative to liver biopsy. Unlike these, RT-E and ARFI have multiple applications in diffuse and tumoral pathology. 