'X-Ray' p16 Searchterm 'X-Ray' found in 8 terms [ • ] and 125 definitions [• ]Result Pages : •
The bisecting angle technique (or bisect angle geometry) is used for radiographic examinations of the teeth. The central axis of the x-ray beam is positioned at right angles to a plane determined by bisecting the angle formed by the long axis of the teeth being imaged, and the plane in which the image receptor is positioned behind the teeth. See also Bitewing Radiograph. •
(Computed tomography number) The CT number is a selectable scan factor based on the Hounsfield scale. Each elemental region of the CT image (pixel) is expressed in terms of Hounsfield units (HU) corresponding to the x-ray attenuation (or tissue density). CT numbers are displayed as gray-scale pixels on the viewing monitor. White represents pixels with higher CT numbers (bone). Varying shades of gray are assigned to intermediate CT numbers e.g., soft tissues, fluid and fat. Black represents regions with lower CT numbers like lungs and air-filled organs. •
A cathode is an electrode through which electric current flows out of a polarized electrical device. X-rays are produced by bombarding a target (the cathode), which is usually made of tungsten.
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Compton scattering is the deflection of gamma- and x-ray photons by electrons. See also Compton Continuum, Compton Effect, Air Kerma, Filter Grid, Focused Grid, Grid Efficiency, and Compton Arthur Holly. Further Reading: News & More:
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(CR) Computed radiography is an imaging technique that uses similar equipment to conventional radiography except that films are replaced by imaging plates. An imaging plate contains photostimulable storage phosphors, which store the radiation level received at each point in local electron energies. The imaging plate is placed under the patient in the same way as conventional film cassettes. After x-ray exposure, the imaging plate is run through a special scanner to read out the image. The digital image can then be processed to optimize contrast, brightness, and zoom. Computed Radiography can be seen as halfway between film-based conventional technology and current direct digital radiography. Further Reading: Basics:
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