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What is Ultrasound?

Written by : DoctorNDTV Team

Ultrasound is a technique that uses sound waves to study the internal parts of the body. High-frequency sound waves (20,000Hz and above), which are beyond the range of normal hearing are transmitted to the area that needs to be studied and the returning echos are recorded. The technical term for ultrasound testing and recording is sonography. It is used widely in every branch of medicine eg. in obstetrics to study the foetus, in cardiology to detect heart damage and in ophthalmology to detect problems related to the eye. Sometimes ultrasound waves may be used to treat joint pains and in lithotripsy (a procedure in which shock waves break up kidney stones, eliminating the need for surgery). Ultrasound has been used in medicine since the Second World War and is recognised as a non-invasive and an inexpensive imaging technique.

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