Some articles on phase, phase contrast, contrast:
... Phase-contrast imaging is a method of imaging that has a range of different applications ... In conventional light microscopy, phase contrast can be employed to distinguish between structures of similar transparency, and to examine crystals on ... In X-ray tomography, the same physical principles can be used to increase image contrast by highlighting small details of differing refractive index within structures that are ...
... Phase-contrast x-ray imaging refers to a variety of techniques that use phase information of a coherent x-ray beam to image soft tissues ... There are several technologies being used for x-ray phase-contrast imaging, all utilizing different principles to convert phase variations in the x-rays emerging ... These include propagation-based phase contrast, talbot interferometry, refraction-enhanced imaging, and x-ray interferometry ...
... See also Phase contrast microscopy and Quantitative phase contrast microscopy Phase contrast takes advantage of the fact that different structures have different refractive indices, and so bend light and ... The retardation of the light results in some waves being 'out of phase' with others, and so to the human eye a microscope in phase contrast mode effectively darkens or brightens particular ... Phase contrast is used extensively in optical microscopy, in both biological and geological sciences ...
... In electron microscopy Phase-contrast imaging More sophisticated techniques will show proportional differences in optical density ... Phase contrast is a widely used technique that shows differences in refractive index as difference in contrast ... Contrast is excellent however it is not for use with thick objects ...
... Contrast formation in the TEM depends greatly on the mode of operation ... In this mode the contrast formation, when considered classically, is formed directly by occlusion and absorption of electrons in the sample ... analyses require the modelling of the sample to include phase information ...
Famous quotes containing the words contrast and/or phase:
“In contrast to the flux and muddle of life, art is clarity and enduring presence. In the stream of life, few things are perceived clearly because few things stay put. Every mood or emotion is mixed or diluted by contrary and extraneous elements. The clarity of art—the precise evocation of mood in the novel, or of summer twilight in a painting—is like waking to a bright landscape after a long fitful slumber, or the fragrance of chicken soup after a week of head cold.”
—Yi-Fu Tuan (b. 1930)
“The Indians feel that each stage is crucial and that the child should be allowed to dwell in each for the appropriate period of time so that every aspect of his being can evolve, just as a plant evolves in the proper time and sequence of the seasons. Otherwise, the child never has a chance to master himself in any one phase of his life.”
—Alan Quetone (20th century)