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14 Cards in this Set
- Front
- Back
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How do you store film?
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* temp no greater than 68-70
* humidity - 40-60% * stored on end - NOT flat * if stored flat=pres. marks |
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Film is protected frm the following to prevent inc. density and fog...
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1. radiation
2. Fumes 3. Outdating 4. Light |
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Handling film
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* Pressure marks-stored flat
* static * crinkle/half moom marks |
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Static caused by...
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* static buildup on tray
* static buildup loading bench * low humidity in darkrm * sliding film frm tray -should be placed |
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Half moon / crescent marks
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* bending over fingernail when hlding
* other rough handling |
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Intensifying screens -
Base of film or backing |
*made of polyester
*mounted inside cassette - prs |
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dbl emulsion film
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Supercoat - Emulsion - Adhesive - Base - Adhesive - Emulsion - Supercoat
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Intensifying screens
Reflectv Layer |
*between base and actv layer
*reflects light frm crystals toward film *increasing speed |
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Intensifying screen makeup
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Protectv layer
Phosphor layer Reflective layer / absorbing Base |
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Instensifying screens
Actv layer - Phosphor |
*adheres to base
*phosphors glow with visible lght when struck by radiation *phosphor size decrease - resolution increases |
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Resolution is measured in...
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* line pairs per mm
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What is a resolution grid?
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resolution quality control test -
it is radiographed so that the image can be evaluated |
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Intensifying screen
Protectv layer |
*thin coating on top of avtc layer to avoid scratches and other damage
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Screen speed (sensativity)
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*Phosphor used
*Phosphor size - lrg, fast *Phosphor layer thickness - thicker, faster *efficiency or reflctv layer - more eff, faster *yellow dye in actv layer - yellow absorbs some phosphors light and reduces speed *conversion efficiency-ability of phosphors to absorb xray energy and it convert it to visible light rays; higher conversions-faster screens |
