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KEYWORDS: Ultrasound


ULTRASOUND is a sound wave with frequencies higher than the upper limit of human hearing. This limit varies from person to person and is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. It is not different from ‘normal’ (audible) sound in its physical properties, only in that humans cannot hear it. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz. See also SONOGRAPHY.

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