principles of ultrasonography

  • Sam N. Hassani


Sound is a mechanical vibration of particles in a medium around an equilibrium position. Sonic waves require a medium of a molecular nature in order to propagate. The highest frequency audible to the human ear is 20,000 cycles per second or 20 kiloHertz (KHz). Sound waves above this frequency are described as ultrasound. Unlike electromagnetic waves, sound cannot travel across a vacuum (10).


Sound Wave Ultrasonic Wave Beam Width Acoustic Impedance Radio Frequency Signal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag New York Inc. 1978

Authors and Affiliations

  • Sam N. Hassani
    • 1
    • 2
  1. 1.State University of New YorkStony BrookUSA
  2. 2.Ultrasound Division, Department of RadiologyQueens Hospital CenterJamaicaUSA

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