wk 1-5 definitions Flashcards
anode
positively charged terminal in the x-ray tube containing the target
bucky tray
metal sliding tray that is positioned under the x-ray table - the grid is on top and the cassette is placed on the lower metal tray
calipers
a device used to measure the anatomical part to be radiographed
cassette
a metal hinged envelope containing a pair of intensifying screens that hold and protect the x-ray film while in normal light
cathode
the negative terminal of the x-ray tube from which electrons are emitted
collimator
a device used to restrict the field covered by the x-ray beam
contrast
the difference in density of adjacent tissues
darkroom
a room which is totally free of light where x-ray film is developed
density
the amount of blackness on the developed radiograph
developer
a chemical whose primary function is to reduce the exposed silver halide crystals into metallic silver
film badge
a photographic film inserted in a small holder used as a radiation monitor
fixer
a chemical whose purpose is to convert the undeveloped silver halide crystals left on the film into a soluble compound and dissolve them away
FFD
the distance from the x-ray tube to the film
focal spot
the area on the surface of the tungsten target that is bombarded by electrons during the production of x-rays
grid
a series of thin lean strips contained in a radiolucent material designed to absorb scatter radiation
heel effect
unequal distribution of radiation with more rays come out on the cathode end
intensifying screens
consist of a thin layer of crystals which are used in pairs in a cassette to reduce the radiation exposure required
KVp
determine the penetrating power of the x-ray beam
lead aprons and gloves
PPE from scatter radiation only
MA-milliampere
a term that describes the number of electrons boiled off the filament
mAs
milliampre/second - mA x time = mAs
radiation
the propagation of energy through space or matter
safe light
a light with a special brown or dark read filter; in a darkroom
technique chart
a chart used to set up the mAs and KVp prior to an x-ray exposure
timer
device used to control the length of exposure on the x-ray machine
x-ray film
a sheet of polyester which has silver halide crystals affixed on both sides; sensitive to light, pressure, and x-ray
