Abstract
Ultrasound refers to any sound that is above audible sound in the acoustic spectrum. The human ear is capable of hearing sounds in a frequency range between 20 to 20,000 Hz (Hz), so 20 to 20,000 cycles per second (1000 cycles per second equals 1 kilohertz or 1 kHz). Only young children hear the high range while, with aging, the upper limit drops to about 12,000 cycles per second.
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Bruyn, G.A., Schmidt, W.A. (2023). Fundamentals of Musculoskeletal Ultrasound. In: Musculoskeletal Ultrasound for the Rheumatologist. Springer, Cham. https://doi.org/10.1007/978-3-031-27737-5_2
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DOI: https://doi.org/10.1007/978-3-031-27737-5_2
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