Physics 2

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Author:
dedr4289
ID:
23250
Filename:
Physics 2
Updated:
2010-06-12 18:17:13
Tags:
ultrasound physics
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Description:
Ultrasound Physics
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  1. When can scattering occur?
    If the boundary between two media has irregularities (with a size similar to or a bit smaller than the pulse's wavelength), then the wave may be chaotically redirected in all directions
  2. What is Specular Reflection?
    Reflections from a smooth reflector (mirror) are specular and return in one direction.
  3. Under what conditions does Rayleigh Scattering occur?
    If a reflector is much smaller than the wavelength of sound, sound is uniformly distributed in all directions (omnidirectional). Higher frequency sound undergoes more Rayleigh scattering. A red blood cell is a Rayleigh scatterer.
  4. What is the Attenuation Coefficient in soft tissue?
    In soft tissue, the attenuatio coefficient (dB/cm) is approximately one-half of the frequency (MHz).

    0.5dB/cm/MHz

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