Abstract
Ultrasound consists of waves of frequency above 18,000 Hz and hence outside the audible range. Sound is audible in the frequency range 16 to 18,000 Hz; below 16 Hz one speaks of infrasound or subsonic vibrations.
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© 1975 Springer-Verlag Berlin Heidelberg
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Schams, H., Bretscher, J. (1975). Introduction. In: Ultrasonographic Diagnosis in Obstetrics and Gynecology / Ultraschalldiagnose in Geburtshilfe und Gynäkologie / Echographie en obstétrique et gynécologie / Diagnostico con ultrasonido en obstetricia y ginecologia / La diagnosi ecografica a ultrasuoni nell’ ostetricia e nella ginecologia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66133-4_1
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DOI: https://doi.org/10.1007/978-3-642-66133-4_1
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-66135-8
Online ISBN: 978-3-642-66133-4
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