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Radiology

Chapter 3 Vocab

TermDefinition
Alternating Current a flow of electrons in one direction, followed by a flow of electrons in the opposite direction.
Anode the positive electrode in the x-ray tube.
Cathode The negative electrode in the x-ray tube.
Central Ray The central portion of the primary beam of radiation.
Collimator A diaphragm, usually lead, designed to restrict the dimensions of the useful beam.
Dead-man switch A switch so constructed that a circuit closing contact can only be maintained by continuous pressure by the operator.
Direct Current electric current that flows continuously in one direction. Ideal for use with digital imaging.
Electron Cloud a mass of free electrons that hovers around the filament wire of the cathode when it is heated to incandescence. The number of free electrons increases as the milliamperage is increased.
Exposure Button Keypad or switch that activates the x-ray production process.
Filament the spiral tungsten coil in the focusing cup of the cathode of the x-ay tube.
Filter absorbing material, usually aluminum, placed in the path of the beam of radiation to remove a high percentage or the low energy x-rays.
Focal Spot small area on the target on the anode toward which the electrons from the focusing cup of the cathode are directed. X-rays originate at the focal spot.
Focusing Cup A curved device around the cathode wire filament that is designed to focus the free electrons toward the tungsten target of the anode.
Impulse measure of exposure time 60/second
Intensity The total energy of the x-ray beam. The product of the number of x-rays and energy of each x-ray per unit of area per time of exposure.
Kilovolt Peak the crest value in kilovolts of the potential difference of a pulsating generator.
Milliamperage one thousandth of an ampere. Milliamperage determines the number of electrons available at the filament.
Primary Beam The original undeflected useful beam of radiation that emanates at the focal spot of the x-ray tube and emerges through the aperture of the tube head.
Quality Term used when describing the intensity of the x-ray beam. Refers to the energy strength or penetrating ability of the x-ray beam.
Quantity Refers to the number of x-rays in the beam.
Target Small block of tungsten imbedded in the face of the anode; bombarded by the electrons streaming from the cathode. The focal spot is located on the target.
Thermionic Emission The release of electrons when a material is heated to incandescence. Electrons in the x-ray tube when electric current is passed through.
Tube Head Protective metal covering that contains the x-ray tube, the high voltage and low voltage transformers and insulating oil. Attached to the flexible extensions arm by a yoke. The PID attaches to the tube head at the port.
Tungsten Element with an atomic number of 74. High melting point makes this metal ideal for use as the cathode filament and as the anode target.
X-ray Tube Electronic tube located in the tube head that generates x-rays.
Created by: Strobelight95