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PRI Test 3


layers of intensifying screens protective coating phosphor reflective layer or absorbing layer base
layers of films supercoat emulsion adhesive base
thicker phorsphor screen speed increase recorded detail decrease patient dose decrease
larger phosphor crystal size screen speed increase recorded detail decrease patient dose decrease
reflective layer screen speed increase recorded detail decrease patient dose decrease
aborbing layer screen speed decrease recorded detail increase patient dose increase
dye in phosphor layer screen speed decrease recorded detail increase patient dose increase
when intensifying screens are used what % is light and what % is x-ray 90 to 99% light and 1 to 10% is x-ray
what are the rare earth elements lanthanum oxybromide (blue) yttrium tantalate (ultraviolet/blue) gadolinium oxysulfide (green)
density vs film speed screen speed increases density increases screen speed decrease density decrease
how is film stored film box stored vertically temperature: 50 to 70 degrees F (10-21 degees C) relative humidity: 40% to 60% FIFO
processing stages developing-convert the latent image visible image fixing-remove unexposed silver halide film washing- remove fixing solution from surface drying-remove 85% to 90% of moisture (10% to 15% moisture remain)
artifacts unwanted image on a radiography
types of rollers entrance roller transport roller-move film through chemical tanks and dyer assembly turnaround roller-located at bottom of roller assembly crossover roller-move film from one tank to another
squeegee located between the wash tank and the dryer
replenishment system replacement of fresh chemicals after the loss of chemical during processin
recirculation system circulate the solutions in each of the developer and fixer tanks by pumping solution out of one portion of the tank and returning it to a different location within the same tank from which it was removed
spectral matching correctly matching the color sensitivity of the film to the color emission of the intensifying screen
spectral emission refers to the color of light produced by a particular intensifying screen
spectral sensitivity refers to the color of light to which a particular film is most sensitive
what keep crystal suspended gelatin
spectral emission calcium tungstate (bue) gadolinium oxysulfide (green) lanthanum oxybromide (blue) yttrium tantalate (ultraviolet/blue)
t-grain(tabular grain) uses flat silver halide crystals instead of randomly shaped crystals; increases recorded detail
what is the active ingredient of the radiographic emulsion silver halide crystals
linear grid line run in one direction
parallel grid non-focused
focused grid lines are canted or angled
crossed/cross-hatched lead strips run both the length and width of the grid forming a criss-crossed pattern
silver halide material that is sensitive to radiation and light in the film's emulsion
types of grids wafer grid (tape on grid) grid cassette grid cap
grid ratio increase contrast increase patient dose increase likelihood of grid cutoff increase
screen contact testing hang film on view box step back 72" from view box abd view film areas of increased density or loss of resolution indicates poor contact or stained screens
grid cutoff error upside-down focused off-level off-center off-focus
grid ratio height of lead strip divided by the width of the interspace
grid frequency express the number of lead lines per unit length, in inches, centimeters, or both
beam-restricting devices aperture diaphragm cones and cylinders variable aperture beam-limiting devices(collimators); PBL
indirect conversion the light interacts with a layer smorphous silicon
direct conversion exit radiation interacts directly with a layer of amorphous selenium
TFT thin film transistor-collection element where the electrical charge is stored until readout
imaging plate latent image conttains fluorohalide crystal
fluorescence emission of luight only during the stimulation of the phosphor; moment stimulation from radiation is stopped, light stop
phosphorescence with an afterglow duration; phosphors continues to emit light even after the stimulation
luminescence ability of a material to emit light in response radiation stimulation
safelights Kodak Wratten Series (orange-brown in color)for ordinary blue-violet sensitive film Kodak GBX(dark read) for green sensitive Orthro-G film
Thinner or smaller crystal or decrease concentration of crystals (screen speed decrease or slow) increase resolution decrease density increase patient dose
thicker or larger crystal or increase concentration of crystals (screen speed increase or fast) decrease resolution increase density decrease patient dose
Created by: dawn2000