Therefore, we have a stimulated emission, which means a lot of energy ( e . g ., acoustic radiation, phonons ) is released at the same time.
12.
The standing waves can form stable acoustic potential energy field, so they are able to create stable acoustic radiation force distribution, which is desirable for many acoustic tweezers applications.
13.
These forces, including acoustic radiation force, secondary field force between particles, and Stokes drag force, create the phenomena of acoustophoresis, which is the foundation of acoustic tweezers technology.
14.
When multiple particles in a suspension are exposed to a standing wave field, they will not only experience acoustic radiation force, but also secondary acoustic forces caused by waves scattered by particles.
15.
The primary acoustic radiation force equation tells us that the acoustic force can move particles either towards a node or an anti-node of a standing wave depending on their densities and compressibilities.
16.
Combined use of Fibroscan and Fibrotest could avoid a liver biopsy in most patients with chronic hepatitis C . Other ultrasonic techniques used to characterize liver stiffness include Acoustic Radiation Force Impulse ( ARFI ) Imaging.
17.
At the stage of scientific preclinical research, the technique of acoustic radiation force was implemented as a prototype in clinical ultrasound systems and validated " in vivo " in 2D and 3D imaging modes.
18.
The most prominent are : Quasistatic Elastography / Strain Imaging, Shear Wave Elasticity Imaging ( SWEI ), Supersonic Shear Imaging ( SSI ), Acoustic Radiation Force Impulse imaging ( ARFI ), and Transient Elastography.
19.
When a particle is suspended in the field of a sound wave, a so-called acoustic radiation force, which arises from the scattering of the acoustic waves on the particle, will exert on the particle.
20.
Displacement produced by such non-dissipative acoustic radiation force in inhomogeneous media can be in both directions ( outward and inward toward the transducer ) depending on the sign of the gradient of energy density of the propagating wave.
