Acoustic Coupling
Acoustic Coupling - Related Videos
12:26
Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Cited by 4 •
2013
In this video we first describe fabrication and operation procedures of a surface acoustic wave (SAW) acoustic counterflow device. We then demonstrate an experimental setup that allows for both qualitative flow visualization and quantitative analysis of complex flows within the SAW pumping device.
14:22
Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Cited by 6 •
2014
Acoustic cavitation in liquids submitted to power ultrasound creates transient extreme conditions inside the collapsing bubbles, which are the origin of unusual chemical reactivity and light emission, known as sonoluminescence. In the presence of noble gases, nonequilibrium plasma is formed. The "hot" particles and the photons generated by collapsing bubbles are able to excite species in solution.
11:32
A Microfluidic Platform for Precision Small-volume Sample Processing and Its Use to Size Separate Biological Particles with an Acoustic Microdevice
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Cited by 9 •
2015
This protocol describes a system architecture for performing automated small volume (0.15–1.5 ml) particle separations using a microfluidic device, and discusses methods to optimize acoustofluidic device performance and operation.
08:38
Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
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Cited by 164 •
2011
Habituation and prepulse inhibition of startle are operational measures of sensory gating. Sensory gating is disrupted in schizophrenia, and some other mental disorders and neurodegenerative diseases. We here describe a standard protocol to assess short-term and long-term habituation as well as prepulse inhibition of acoustic startle responses in rats and mice.
04:54
A Stable Phantom Material for Optical and Acoustic Imaging
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Cited by 8 •
2023
This protocol describes the fabrication of a stable, biologically relevant phantom material for optical and acoustic biomedical imaging applications, featuring independently tunable acoustic and optical properties.
FAQs
Large differences in acoustic impedance cause more sound energy to reflect at an interface instead of entering the next material. Reducing that mismatch allows a greater portion of the acoustic wave to pass into tissue and return to the device. This improves the efficiency of signal transmission and supports more dependable biological measurements.
Coupling gel displaces air between the device and the tissue surface. Because trapped air interferes with transmission, replacing it with a suitable contact medium reduces the barrier at the interface. The resulting improvement in wave transfer helps ultrasound systems deliver energy into tissue and receive returning signals with less loss.
Insufficient coupling can increase reflection at the device-tissue boundary and weaken the acoustic signal entering or returning from tissue. In practice, this may reduce image quality and make measurements less reliable. For biological studies, consistent coupling is therefore important when interpreting anatomy, physiology, or tissue responses from acoustic data.
The device is placed in direct contact with tissue or separated from it by a coupling medium such as gel. The medium fills the interface where air could otherwise interfere with transmission. Once the acoustic path is established, the system can send waves into tissue and collect returning signals for analysis.
In ultrasound imaging, coupling supports delivery of sound into tissue and improves reception of echoes used to represent internal anatomy. Doppler measurements likewise depend on reliable signal transmission and return when assessing physiological information. Better coupling can increase image quality and measurement reliability without requiring invasive access to the studied region.
Focused ultrasound procedures require effective transfer of acoustic energy from a device into tissue, while biological research may examine anatomy, physiology, or tissue responses. Acoustic coupling supports both functions by improving the interface between the source and tissue. Its value extends from noninvasive observation to controlled delivery of acoustic energy in biomedical studies.