Everything about The Acoustic Contrast Factor totally explained
The
acoustic contrast factor is a number used to describe the relationship between the
densities and the
sound velocities (or, equivalently because of the form of the expression, the densities and
compressibilities) of two media. It is most often used in the context of
biomedical ultrasonic imaging techniques using
acoustic contrast agents and in the field of ultrasonic manipulation of particles much smaller than the
wavelength using ultrasonic standing waves. In the latter context, the acoustic contrast factor is the number which, depending on its sign, tells whether a given type of particle in a given medium will be attracted to the
pressure nodes or
anti-nodes.
Example - particle in a medium
Given the compressibilities
and
p and densities
and
p of the medium and particle, respectively, the acoustic contrast factor
can be expressed as
»
For a positive value of
, the particles will be attracted to the pressure nodes, and vice versa.
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