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What (who) is ultrasonography - definition
![Head of a fetus, aged 29 weeks, in a "[[3D ultrasound]]"](https://commons.wikimedia.org/wiki/Special:FilePath/3dultrasound.png?width=200 "Head of a fetus, aged 29 weeks, in a \"[[3D ultrasound]]\"")
![Sonogram]] of a fetus at 14 weeks (profile)](https://commons.wikimedia.org/wiki/Special:FilePath/Embryo at 14 weeks profile.JPG?width=200 "Sonogram]] of a fetus at 14 weeks (profile)")
![A [[dog whistle]], which emits sound in the ultrasonic range, used to train dogs and other animals](https://commons.wikimedia.org/wiki/Special:FilePath/Hundepfeife01.JPG?width=200 "A [[dog whistle]], which emits sound in the ultrasonic range, used to train dogs and other animals")
![spline]] cracking](https://commons.wikimedia.org/wiki/Special:FilePath/Swing shaft spline cracking.png?width=200 "spline]] cracking")
![[[Doppler ultrasonography]] showing absence of flow and hyperechogenic content in deep vein thrombosis of the [[subsartorial vein]].](https://commons.wikimedia.org/wiki/Special:FilePath/Ultrasonography of deep vein thrombosis of the femoral vein -annotated.jpg?width=200 "[[Doppler ultrasonography]] showing absence of flow and hyperechogenic content in deep vein thrombosis of the [[subsartorial vein]].")
![Coronal plane, seen from medial side of lower leg, showing thrombosis of the [[fibular vein]]s, with hyperechoic content and only marginal blood flow.](https://commons.wikimedia.org/wiki/Special:FilePath/Ultrasonography of thrombosis of the fibular veins, coronal plane, annotated.jpg?width=200 "Coronal plane, seen from medial side of lower leg, showing thrombosis of the [[fibular vein]]s, with hyperechoic content and only marginal blood flow.")
Wikipedia
Ultrasound is sound with frequencies greater than 20 kilohertz. This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz.
Ultrasound is used in many different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is often used in medicine. In the nondestructive testing of products and structures, ultrasound is used to detect invisible flaws. Industrially, ultrasound is used for cleaning, mixing, and accelerating chemical processes. Animals such as bats and porpoises use ultrasound for locating prey and obstacles.
