Editing Medical ultrasound (section)

=== Elastography (ultrasound elasticity imaging) ===
{{Main|Elastography}}
Ultrasound is also used for elastography, which is a relatively new imaging modality that maps the elastic properties of soft tissue.<ref name=Wells>{{cite journal | author = Wells P. N. T. | year = 2011 | title = Medical ultrasound: imaging of soft tissue strain and elasticity | journal = Journal of the Royal Society, Interface | volume = 8 | issue = 64| pages = 1521–1549 | doi = 10.1098/rsif.2011.0054 | pmid = 21680780 | pmc = 3177611 }}</ref><ref name=Sarv>{{cite journal|vauthors=Sarvazyan A, Hall TJ, Urban MW, Fatemi M, Aglyamov SR, Garra BS |pmc=3269947 |title=Overview of elastography–an emerging branch of medical imaging|journal=Current Medical Imaging Reviews |volume=7 |issue=4 |pages=255–282 |year=2011 |pmid=22308105 |doi=10.2174/157340511798038684}}</ref> This modality emerged in the last two decades. Elastography is useful in medical diagnoses as it can discern healthy from unhealthy tissue for specific organs/growths. For example, cancerous tumors will often be harder than the surrounding tissue, and diseased livers are stiffer than healthy ones.<ref name=Wells/><ref name=Sarv/><ref>{{cite journal|author1=Ophir, J. |author2=Céspides, I. |author3=Ponnekanti, H. |author4=Li, X. |title=Elastography: A quantitative method for imaging the elasticity of biological tissues|journal=Ultrasonic Imaging|volume=13|issue=2|pages=111–34|doi=10.1016/0161-7346(91)90079-W|pmid=1858217|year=1991}}</ref><ref>{{cite journal|author1=Parker, K J |author2=Doyley, M M |author3=Rubens, D J |title=Corrigendum: Imaging the elastic properties of tissue: The 20 year perspective|journal=Physics in Medicine and Biology|volume=57|issue=16|pages=5359–5360|doi=10.1088/0031-9155/57/16/5359|year=2012|bibcode=2012PMB....57.5359P|doi-access=free}}</ref>

There are many ultrasound elastography techniques.<ref name=Sarv/>