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Ultrasound

Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz (20,000 hertz) in healthy young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.

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423,697
Prior Five Years
101,331
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4,988,461
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628,826
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463,787
Prior Five Years
346,174

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Canada
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Canada
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United States
#2
China
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France
#3
United States
#3
United States
#3
United States
#4
United Kingdom
#4
United Kingdom
#4
United States
#5
United States
#5
Italy
#5
Netherlands
#6
United States
#6
Iran
#6
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#7
United States
#7
United States
#7
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#8
Belgium
#8
Italy
#8
United States
#9
United States
#9
United States
#9
Japan
#10
United States
#10
United Kingdom
#10
United States
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