Chap 3 Screens
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | intensifying screens
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| What % of the x-ray that strike a radiographic intensifying screen interact with the screen? | show 🗑
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| show | luminescence
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| show | luminescent material or a phosphor
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| show | outer-shell electrons are raised to excited levels, the hole left is filled when the excited electron returns to its normal state, and light is emitted
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| show | luminescence
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| What are the two types of luminescence? | show 🗑
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| show | fluorescence
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| -screen lag, after glow | show 🗑
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| show | base, reflective layer, phosphor, protective coating
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| show | base
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| show | provides mechanical support for the phosphor layer
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| Where is the reflective layer located? | show 🗑
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| show | to redirect light to the film
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| What does isotropically mean? | show 🗑
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| -the amt of light emitted and the efficiency or ease with which a screen converts x-ray energy to light energy | show 🗑
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| show | phosphor layer
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| show | to convert the energy of the xray beam into visible light
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| show | protective coating
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| What is the purpose of the protective coating layer? | show 🗑
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| Why is the back lid of the cassette have lead foil? | show 🗑
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| show | high atomic #, high conversion efficiency, spectrally matched, no afterglow
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| Why is it important for the crystals to have a high atomic number? | show 🗑
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| What color does calcium tungstate emit? rare earth? | show 🗑
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| Who developed calcium tungstate? | show 🗑
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| What is the primary advantage of rare earth screens? | show 🗑
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| show | phosphor composition, active layer thickness,reflective layer, dye, crystal size, crystal concentration
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| The thicker the active layer, the ____ is the relative number of xrays converted into light. | show 🗑
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| High speed screens have _____ active layers; fine detailed screens have ____ active layers. | show 🗑
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| show | by larger crystals, thinner crystal layer, and using a reflective backing
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| The presence of the reflective layer does what to screen speed but has what effect on resolution (detail)? | show 🗑
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| Why are light-absorbing dyes added to phosphors? | show 🗑
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| What effect does dye have to resolution and screen speed? | show 🗑
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| show | higher
decrease
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| What are two extrinsic factors that affect screen speed? | show 🗑
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| As kVp increases, what happens to the screen speed? | show 🗑
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| As temp is lowered, what happens to screen speed? | show 🗑
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| show | rugged and moisture resistant
not suffer radiation damage/age
flexible
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| show | detective quantum efficiency
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| What kind of cassette will result in the highest intensification factor? | show 🗑
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| show | resolution
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| show | line bar test tool
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| show | contrast resolution
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| show | 200 or 400
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| What is an advantage of direct exposure (not using screens) | show 🗑
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| What is another word for radiographic noise? | show 🗑
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| show | To use a slower screen or to increase the mAs
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| show | more
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| show | once a mth
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| What will be the result of poor film-screen contact? | show 🗑
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| Screen speed ____ as the screen ages? | show 🗑
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| show | misues, dropping the cassette, warped front panel, warped screen due to excessive moisture, worn screen backing, foreign particulate btwn the screen and film, trapped airc
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