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Intensifying screen
properties, functions, characteristics
| Question | Answer |
|---|---|
| 4 properties that a phosphor must have | high atomic number,effeciency, approp. sprectral emission, minimal phosporesence |
| This layer is transparent and waterproof | protective coat |
| What is the base of an IS made of? | polyester plastice or cardboard |
| Why is there lead foil on the inside back of a cassette? | reduce residual beam and absorb backscatter |
| Have a greater absorption ability, intensification factor & conversion efficiency & offer increased speed while maintaining resolution | rare earth phosphors |
| What does the phosphor layer consist of and what does it do? | flourescent crystals, emits light when struck by photons |
| Characteristics of intensifying screens | Resolution, speed, contrast, latitude |
| Device that converts the energy of the xray beam into visibile light | intensifying screen |
| Where are intensifying screens attached to the cassette? | inside front and back |
| Why are cassettes/holders curved? | Displacement of air trapped |
| What is the conversion factor for the following screen speed? 100,200,400,800 | 2,1,.50,.25 |
| ability of material to emit light in response to excitation? | luminescence |
| When light emitted from a phosphor is delayed | phosphorescence |
| ability of the phosphor to emit as much light as possible per interaction is a measurement of | screen speed |
| Layer of IS made of magnesium oxide or titanium dioxide | reflective layer |
| Light that is emitted instantaniously | fluorescence |
| speed of an imaging system depends on what 3 things of the phosphors? | thickness, size and efficiency |
| What type of film is IS usually used with? | duplitized |
| active layer of the IS | phosphor layer |
| This layer lies closest to the film | protective layer |
| % of xray photons that actually interact with the IS | less than 33% |
| 4 layers of the IS | base, reflective, phosphor, protective coat |
| important component of the base of an IS | radiolucency |
| what needs to increase to increase speed of an IS | phosphor size |
| 3 properties of an intensifying screen | chemically inert, mositure resistant,does not discolor with age |
| the light from an intensifying screen is emitted how when hit with xray photons | isotropically |
| screen that continues to emit light after exposure ends exhibits | screen lag |
Created by:
chocokitty
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