Physical Basis and Elementary Technology
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Ultrasounds can be defined as mechanical vibrations of matter at frequencies beyond those audible to human ears (that is to say, above 20000 Hz). The frequencies most generally used in sonography range between 1000000 and 10000000 Hz (1–10 MHz).
KeywordsAcoustic Impedance Lateral Resolution Acoustic Energy Axial Resolution Ultrasound Beam
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