Time gain compensation

Time gain compensation (TGC) is a setting applied in diagnostic ultrasound imaging to account for tissue attenuation.{{cite book|author1=Inderbir S. Gill|author2=Osamu Ukimura|title=Contemporary Interventional Ultrasonography in Urology|url=https://books.google.com/books?id=SDxJ8e1HDZ4C&pg=PA104|accessdate=19 September 2012|date=2 December 2008|publisher=Springer|isbn=978-1-84800-216-6|page=104}} By increasing the received signal intensity with depth, the artifacts in the uniformity of a B-mode image intensity are reduced.

This means that a TGC module will increase the amount of gain given to an input signal, as its sampling time increases monotonically. This counteracts the excessive sound-dampening properties of human tissue.