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[[File:Philips-IE33.jpg|right|thumb| Philips IE33 Ultrasound]]
'''Ultrasound''' is [[sound]] composed of frequencies in excess of 20,000 [[Hertz]] (20 kHz). Ultrasound falls outside the range of normal [[human]] hearing ability.
'''Ultrasound''' is [[sound]] composed of frequencies in excess of 20,000 [[Hertz]] (20 kHz). Ultrasound falls outside the range of normal [[human]] hearing ability.
An '''ultrasound''' is particularly effective and affordable for viewing an unborn child in a pregnant woman. About 80% of women considering having an [[abortion]] change their mind and keep their child after viewing an ultrasound of him or her.
An '''ultrasound''' is particularly effective and affordable for viewing an unborn child in a pregnant woman. About 80% of women considering having an [[abortion]] change their mind and keep their child after viewing an ultrasound of him or her. Modern ultrasounds have the ability to acquire images in 3D & 4D.
== Applications ==
== Applications ==
* Non-destructive testing (NDT) and non-destructive evaluation (NDE) of materials.
* Non-destructive testing (NDT) and non-destructive evaluation (NDE) of materials.
* Medical [[imaging]] and [[tissue characterization]]. See [[ultrasonic imaging]] and [[ultrasonic tissue characterization]]
* Medical [[imaging]] and [[tissue characterization]]. See [[ultrasonic imaging]] and [[ultrasonic tissue characterization]]
* Therapeutic ultrasound is sometimes recommended for muscle as well as joint pain.
* Range finding ([[sonar]]).
* Range finding ([[sonar]]).
* Cleaning.
* Cleaning.
[[Category:physics]]
[[Category:physics]] [[Category:Medicine]]