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Radiology SEE

QuestionAnswer
the negative electrode (terminal) in the x-ray tube. The cathode consists of a tungsten filament wire that is set in molybdenum focusing cup that directs the cathode stream toward the target on the anode. Cathode
the positive electrode (terminal) in the x-ray tube. Tungsten block, normally set at a 20-degree angle facing the cathode, embedded in the copper portion of the terminal. anode
diaphragm, usually lead, designed to restrict the dimensions of the useful beam collimator
either of two terminals of tan electric source. In the x-ray tube, either the anode or the cathode. electrode
absorbing material, usually aluminum, placed in the path of the beam of radiation to remove a high percentage of the low energy (lower wavelength) x-rays. filler
the spiral tungsten coil in the focusing cup of the cathode of the x-ray tube. filament
: stage when the tungsten filament in the cathode becomes red hot and glows. Free electrons are liberated and swarm around the glowing fire to form the electron cloud. incandescence
a term derived of the Greek meaning “having many colors.” Used in dental radiography to describe the x-ray beam because it is composed of many different wavelengths polychromatic
the crest value in kilovolts of the potential difference of the pulsating generator. kilovolt peak
the release of electrons when a material such as tungsten is heated to incandescence. Electrons are boiled off from the cathode filament in the x-ray tube when electric current is passed through it. thermionic emission
Element with an atomic number of 74. High melting point makes this metal ideal for use as the cathode filament and s the anode target. tungsten
curved portion of the x-ray machine that is connected to the extension arm. The tube head is suspended within the yoke and can be rotated vertically and horizontally within it. yoke
the unit of intensity of an electric current produced by 1 volt acting through a resistance of 1ohm. ampere
a mass of free electrons that hovers around the filament wire of the cathode when it is heated to incandescence. The number of free electron increases as the miliamperage is increased. electron coloud
a path of electrical current. electrical circuits
key pad or switch that activates the x-ray production process. exposure button
small area on the target on the anode toward which the electrons from the focusing cup of the cathode are directed. focal spot
term used when describing the intensity of the x-ray beam. Refers to the number of x-rays in the beam. quantity
Term used when describing the intensity of the x-ray beam. Refers to the penetrating ability of the beam quality
protective metal covering that contains the x-ray tube, the high-voltage and low-voltage transformers, and insulating oil. Attached to the flexible extension arm by a yoke. The PID attaches to the tube head at the port. tube head
electronic tube located in the tube head that generates x-rays x-ray tube
Created by: sarahearl on 2010-11-23



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