Refractive Index Mapping
Refractive Index Mapping - Related Videos
13:59
Reflection and Refraction
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2023
Source: Derek Wilson, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Light travels at different speeds depending on the material through which it is propagating. When light travels from one material to another, it will either slow down or speed up. In order to conserve energy and momentum, the light must change the direction in which it propagates. This bending of light is known as refraction. Some fraction of the...
06:58
Fate Mapping
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2023
Fate mapping is a technique used to understand how embryonic cells divide, differentiate, and migrate during development. In classic fate mapping experiments, cells in different areas of an embryo are labeled with a chemical dye and then tracked to determine which tissues or structures they form. Technological improvements now allow for individual cells to be marked and traced throughout embryonic development and adulthood. This video reviews the concepts behind fate mapping, and then details a...
11:03
Motor Maps
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2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California One principle of brain organization is the topographic mapping of information. Especially in sensory and motor cortices, adjacent regions of the brain tend to represent information from adjacent parts of the body, resulting in maps of the body expressed on the surface of the brain. The primary sensory and motor maps in the brain surround a prominent sulcus known as the central sulcus. The cortex...
05:36
Subjective Refraction Test Using a Smartphone for Vision Screening
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Cited by 1 •
2024
This paper presents the protocols and clinical validation data for using a smartphone app to subjectively measure refractive error.
09:54
Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics
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Cited by 6 •
2018
This protocol describes the fabrication of microfluidic devices from MY133-V2000 to eliminate artifacts that often arise in microchannels due to the mismatching refractive indices between microchannel structures and an aqueous solution. This protocol uses an acrylic holder to compress the encapsulated device, improving adhesion both chemically and mechanically.
FAQs
The key signal is a change in light propagation caused by differences in refractive index across the specimen. Measurements of phase shifts or optical path length capture how light interacts with distinct regions. Reconstruction then converts those measurements into a spatial distribution, allowing structural differences to be compared across cells or tissue regions.
Refractive index reflects differences in composition and density, so spatial variations can correspond to changes in cellular or tissue organization. A map therefore provides more than an outline of specimen shape: it can show intracellular organization and regional structural differences. Interpretation depends on relating these optical variations to the biological structures being studied.
Refractive Index Mapping provides label-free information, reducing dependence on fluorescent labels during quantitative imaging. This is valuable when researchers want to examine cellular or tissue structure without making labeling the central requirement. The resulting measurements can support observations of morphology, intracellular organization, and changes associated with growth or physiological state.
The process measures changes in light propagation through a biological specimen, focusing on phase shifts or optical path length. Those measurements are then analyzed to reconstruct spatial refractive index distributions. The resulting map can be examined for variations across cells or tissues, providing a quantitative basis for assessing morphology and internal organization.
It is useful when researchers need quantitative information about living cells or tissues while reducing dependence on fluorescent labels. The approach supports examination of structure and dynamics in biological specimens, including cellular morphology and intracellular organization. It can also help track changes linked to growth or physiological state in the material being studied.
Refractive index maps can be used to examine structural changes associated with growth, physiological state, and disease-related alterations. Because the measurements describe spatial differences across a specimen, researchers can compare cellular or tissue organization and identify how those patterns change. This makes the method relevant to studies of biology, dynamics, and disease-associated structure.