Speckle Pattern Creation
Speckle Pattern Creation - Related Videos
05:58
Plasma Lithography Surface Patterning for Creation of Cell Networks
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Cited by 16 •
2011
A versatile plasma lithography technique has been developed to generate stable surface patterns for guiding cellular attachment. This technique can be applied to create cell networks including those that mimic natural tissues and has been used for studying several, distinct cell types.
05:24
How to Build a Laser Speckle Contrast Imaging (LSCI) System to Monitor Blood Flow
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Cited by 25 •
2010
This video demonstrates how to build a Laser Speckle Contrast Imaging (LSCI) system that can easily be used to monitor blood flow.
10:49
Printing Thermoresponsive Reverse Molds for the Creation of Patterned Two-component Hydrogels for 3D Cell Culture
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Cited by 60 •
2013
A bioprinter was used to create patterned hydrogels based on a sacrificial mold. The poloxamer mold was backfilled with a second hydrogel and then eluted, leaving voids which were filled with a third hydrogel. This method uses fast elution and good printability of poloxamer to generate complex architectures from biopolymers.
19:16
Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)
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Cited by 8 •
2009
Selection, microinjection, and imaging of fluorescently-labeled F-actin via fluorescent speckle microscopy (FSM).
09:39
Creation of Reversible Cholestatic Rat Model
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2011
Cholestasis is a clinical condition commonly encountered by both surgeons and gastroenterologists. Creation of a reversible cholestatic rat model can be challenging in view of the smaller size and unique hepatopancreatobiliary anatomy in rats. This video article demonstrates the creation of a reversible cholestatic model.
FAQs
Bright and dark regions arise from interference between scattered wavefronts. Because each wavefront travels a different optical path, the waves reach detection with different phases. Constructive interference increases intensity, whereas destructive interference reduces it. This path-dependent combination creates the granular intensity distribution that can later be analyzed for changes in scattering, motion, or physiological activity.
Illumination, scattering conditions, and detection geometry all influence the observed pattern. Changes in how coherent light reaches a rough surface or heterogeneous medium can alter the scattered wavefronts, while the detection arrangement affects how their interference is recorded. These variables must therefore be considered when comparing patterns or interpreting changes in their structure.
Temporal fluctuations provide information because movement or changing scattering conditions modify the interference pattern over time. Rather than examining only a single intensity distribution, analysis can track how the pattern changes or how its contrast varies. In medicine, this time-dependent behavior supports monitoring of dynamic processes such as changes in tissue perfusion.
A basic workflow uses coherent illumination, such as a laser beam, directed toward a rough surface or heterogeneous medium. The resulting scattered light is recorded according to a defined detection geometry. Researchers then examine pattern contrast, motion, or temporal fluctuations to relate the optical response to scattering behavior or a changing physiological process.
Laser speckle imaging analyzes changes in the speckle signal produced when coherent light interacts with tissue. Measurements may focus on pattern contrast, motion, or temporal fluctuations, which can change as blood flow changes. This provides a noninvasive optical approach for monitoring perfusion-related dynamics rather than requiring direct access to the measured tissue.
Speckle measurements reflect how coherent light is scattered within or from a heterogeneous tissue medium. Examining the resulting pattern structure provides information about the tissue’s scattering behavior, while changes in the signal can indicate altered optical conditions. This makes the approach useful for noninvasive optical characterization alongside measurements of dynamic physiological activity.