RAD 120 - Ch 15 Beam Restriction - Key Terms
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Last updated 10:53 PM on 12/8/25
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4 Terms
1
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Collimator
A set of lead shutters at right angles to one another that move in opposing pairs
2
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Penumbra
A geometric unsharpness around the periphery of the image
3
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Positive Beam Limitation (PBL) Device
An automatic collimator that adjusts to the size and placement of the cassette
4
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Note 
Flashcards (133)