Orthogonal polarization spectral imaging
- Orthogonal polarization spectral imaging
-
Orthogonal polarization spectral imaging is a method for imaging small blood vessels[1] in tissue like the nail bed or lip.
It uses a light source of linearly polarized light with a wavelength of 550 nanometers, the isobestic point for hemoglobin, thus imaging the erythrocytes as they are flowing through the small blood vessels. The reflected light orthogonal (at a 90° angle) to the emitted light is recorded, thus eliminating direct reflections. The depolarized light forms an image of the microcirculation on a CCD, which can be captured through single frames or on videotape. The image produced is as if the light source is actually placed behind the desired target or transilluminated. [2]
It has been validated, even under low hematocrit circumstances[3].
References
Wikimedia Foundation.
2010.
Look at other dictionaries:
Circular polarization — The electric field vectors of a traveling circularly polarized electromagnetic wave. In electrodynamics, circular polarization[1] of an electromagnetic wave is a polarization in which the electric field of the passing wave does not change… … Wikipedia
OPS — may refer to: Organizations Office of Protective Services Office of Public Safety Presidential Communications Operations Office (Philippines), known as Office of the Press Secretary Optical Position Sensor, an electronic device Orchestre… … Wikipedia
Atomic line filter — A potassium Faraday filter designed, built and photographed by Jonas Hedin for making daytime LIDAR measurements at Arecibo Observatory.[1] An atomic line filter (ALF) is an advanced optical band pass filter used in the physical sciences for… … Wikipedia
Computational electromagnetics — Computational electromagnetics, computational electrodynamics or electromagnetic modeling is the process of modeling the interaction of electromagnetic fields with physical objects and the environment. It typically involves using computationally… … Wikipedia
Synthetic aperture radar — (SAR) is a form of radar in which the highly directional (and thus very large) rotating antenna used by conventional radar is replaced with many low directivity small stationary antenna positions scattered over some area near or around the target … Wikipedia
SERF — A spin exchange relaxation free (SERF) magnetometer achieves very high magnetic field sensitivity by monitoring a high density vapor of alkali metal atoms precessing in a near zero magnetic field.cite journal author=Allred, J. C., Lyman, R. N.,… … Wikipedia
Laser beam profiler — A laser beam profiler captures, displays, and records the spatial intensity profile of a laser beam at a particular plane transverse to the beam propagation path. Since there are many types of lasers ultraviolet, visible, infrared, continuous… … Wikipedia
Earth exploration — Introduction the investigation of the surface of the Earth and of its interior. By the beginning of the 20th century most of the Earth s surface had been explored, at least superficially, except for the Arctic and Antarctic regions. Today the… … Universalium