- the numerical unit assigned electronically to each pixel in a computerized tomography (CT) image, according to its X-ray density. The fixed points on the scale are arbitrarily assigned as -1000 for air and 0 for water. The CT image is viewed in a 'window'. The range of Hounsfield units displayed (window width) and the centre point of the range of interest (window level) can be varied by the radiologist in order to observe specific tissues (see windowing). The unit was named after Sir Godfrey Hounsfield (1919- ), who developed CT scanning in the 1950s. Symbol: HU.
* * *Houns·field unit (hounzґfēld) [Sir Godfrey Newbold Hounsfield, British electronics engineer and Nobel prize winner, 1919â€“2004 ] see under unit.
Medical dictionary. 2011.
Look at other dictionaries:
Hounsfield unit — the numerical unit assigned electronically to each pixel in a computerized tomography (CT) image, according to its X ray density. The fixed points on the scale are arbitrarily assigned as 1000 for air and 0 for water. The CT image is viewed in a… … The new mediacal dictionary
Hounsfield unit — (HU) a unit used in medical imaging (CT or MRI scanning) to describe the amount of x ray attenuation of each voxel (volume element) in the three dimensional image. The voxels are normally represented as 12 bit binary numbers, and therefore… … Dictionary of units of measurement
Hounsfield Unit — Der lineare Absorptionskoeffizient μ beschreibt, wie stark monochromatische Röntgenstrahlung beim Durchdringen von Materie entlang des durchstrahlten Wegs abgeschwächt wird. Die Medizin interessiert sich im Rahmen der Computertomografie besonders … Deutsch Wikipedia
Hounsfield scale — The Hounsfield scale is a quantitative scale for describing radiodensity. DefinitionThe Hounsfield unit (HU) scale is a linear transformation of the original linear attenuation coefficient measurement in one in which the radiodensity of distilled … Wikipedia
Hounsfield-Skala — CT Aufnahme eines Kopfes. Die Graustufen repräsentieren CT Zahlen zwischen −5 und 75 HU. Kleinere CT Zahlen werden schwarz dargestellt, größere weiß. Mit der Hounsfield Skala wird in der Computertomographie (CT) die Abschwächung von… … Deutsch Wikipedia
Hounsfield, New York — Infobox Settlement official name = Hounsfield, New York settlement type = Town nickname = motto = imagesize = image caption = image |pushpin pushpin label position = pushpin map caption =Location within the state of New York pushpin mapsize =… … Wikipedia
unit — 1. One; a single person or thing. 2. A standard of measure, weight, or any other quality, by multiplications or fractions of which a scale or system is formed. 3. A group of persons or things considered as a whole because of mutual activities or… … Medical dictionary
Hounsfield — Godfrey N., British electronics engineer, *1919. Developed first practical computed tomography device, the EMI scanner; received the Nobel prize in Medicine in 1979 jointly with physicist A. M. Cormack. See H. unit, H. number … Medical dictionary
HU — heat unit; hemagglutinating unit; hemolytic unit; Hounsfield unit; human urine, human urinary; hydroxyurea; hyperemia unit * * * see Hounsfield unit … Medical dictionary
H — Abbreviation or symbol for hydrogen; hyperopia; hyperopic; horizontal; Hauch; Holzknecht unit; henry, unit of electrical inductance; the Fraunhofer line at λ 3968 due to calcium; … Medical dictionary