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PRI Test 3
PRI
| Question | Answer |
|---|---|
| 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
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