Medical ultrasound - Wikipedia
https://en.wikipedia.org/wiki/Medical_ultrasound
WEBThe machine used is called an ultrasound machine, a sonograph or an echograph. The visual image formed using this technique is called an ultrasonogram, a sonogram or an echogram. Ultrasound of carotid artery. Ultrasound is composed of sound waves with frequencies greater than 20,000 Hz, which is by approximation the upper threshold of …
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