Abstract
The frequency, or pitch, of the sound used in diagnostic systems is much higher (100 to 1000 times) than the limit of audibility. Therefore, this sound is termed ultrasound.
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Thijssen, J.M. (1973). Echo-Ophthalmology: Physical Principles and Diagnostic Value. In: Henkes, H.E. (eds) Photography, Electro-Ophthalmology and Echo-Ophthalmology in Ophthalmic Practice. Documenta Ophthalmologica, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2699-4_18
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DOI: https://doi.org/10.1007/978-94-010-2699-4_18
Publisher Name: Springer, Dordrecht
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