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Radiology SEE
| Question | Answer |
|---|---|
| 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
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