RADD 2501 Class Notes - Film Screen Imaging Powerpoint

RADD 2501 Class Notes - Film Screen Imaging Powerpoint -...

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1 Film-Screen Systems
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2 Purpose It is the visible light from the intensifying screen that actually produces the image. The use of intensifying screens reduces the amount of x-rays (mAs) necessary to produce the image.
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3 Purpose The film responds to the green-yellow (rare earth) or blue- violet (calcium tungstate) from the intensifying screen.
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4 Purpose The film and the screen combine to have a given “speed” (think of photographic film) Speeds are relative to “100” or “par” example: A 400 speed system would only require the quantity of x-rays (mAs) to produce a given density compared to 100 speed system.
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5 system speed patient exposure (mAs ) Compared to a 200 speed system, a 400 speed system would decrease the dose by half (½ the mAs) A 400 speed system is the lowest film-screen system that should be used for spinal radiographs
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film-screen system speed graininess (quantum mottle) Relatively few x-rays produce the image in a high speed system. grainy image.
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This note was uploaded on 11/22/2011 for the course RADD 2501 taught by Professor Sandyeverage during the Winter '11 term at Life Chiropractic College West.

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RADD 2501 Class Notes - Film Screen Imaging Powerpoint -...

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