focal spot value

См. также в других словарях:

• Focal length — The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (diffuses) light. A system with a shorter focal length has greater optical power than one with a long focal length. Thin lens approximation For… …   Wikipedia

• Light value — NOTOC In photography, light value has been used to refer to a ldquo;light level rdquo; for either incident or reflected light, often on a base 2 logarithmic scale.The term does not derive from a published standard, and has had severaldifferent… …   Wikipedia

• Flange focal distance — The flange focal distance (FFD) (also known as the flange to film distance, flange focal depth, flange back distance (FBD), or register, depending on the usage and source) of a lens mount for an interchangeable lens camera system is one of its… …   Wikipedia

• Lens (optics) — For other uses, see Lens. A lens. Lenses can be used to focus light. A lens is an optical device with perfect or approximate axial symmetry which tra …   Wikipedia

• X-ray tube — An X ray tube is a vacuum tube that produces X rays. They are used in X ray machines. X rays are part of the electromagnetic spectrum, an ionizing radiation with wavelengths shorter than ultraviolet light. X ray tubes evolved from experimental… …   Wikipedia

• Airy disk — Computer generated image of an Airy disk. The gray scale intensities have been adjusted to enhance the brightness of the outer rings of the Airy pattern …   Wikipedia

• radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

• Dicom — Digital imaging and commmunications in medicine Une image de médecine nucléaire au format Dicom DICOM (Digital Imaging and COmmunications in Medicine, « imagerie et communication numériques en médecine) est un standard de communication et… …   Wikipédia en Français

• Digital Imaging and Communications in Medecine — Digital imaging and commmunications in medicine Une image de médecine nucléaire au format Dicom DICOM (Digital Imaging and COmmunications in Medicine, « imagerie et communication numériques en médecine) est un standard de communication et… …   Wikipédia en Français

• Digital imaging and commmunications in medicine — Une image de médecine nucléaire au format Dicom DICOM (Digital Imaging and COmmunications in Medicine, « imagerie et communication numériques en médecine) est un standard de communication et d’archivage en imagerie médicale. C est aussi par… …   Wikipédia en Français

• Digital imaging and communications in medicine — Digital imaging and communications in medicine, couramment abrégée DICOM, est une norme standard pour la gestion informatique des données issues de l imagerie médicale. Sommaire 1 Objectifs et avantages 2 Organisation du standard 3 Format …   Wikipédia en Français