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Physical Principles This section provides a description of terminology and wave
propagation associated with QUS measurement of bone.
The fundamental ultrasound parameters
defined include frequency, velocity, intensity and attenuation. Reflection, transmission
and refraction are described by considering the behaviour of an ultrasound wave at an
interface between two tissues. Ultrasound may be propagated by various modes including
longitudinal, shear, bar and surface; each with an associated motion of tissue molecules
and velocity. An accurate description of propagation of an ultrasound wave through a
tissue is provided by considering the beam profile and scattering. |
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