Ultrasound (HT ONLY)

An ultrasound wave is a sound wave at a frequency above the range of human hearing. It is directed as a beam and the waves are partially reflected when they meet a boundary between two different media, and travel back to a detector.
A computer records the reflected waves’ intensities and the times it took for them to return. This information is used to produce an image or determine the depth.
Ultrasound can be used for detection, such as with medical scans or sonar. It is especially useful for foetal scanning as it doesn't harm the patient or unborn baby.

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