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CR Exposure Indicator System

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    EI Numbers
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  • (T or F) Each manufacturer has their own system for the Exposure Indication.
    True
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  • (T or F) The EI Indicates how much radiation (or exposure) reached the receptor.
    True
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  • EI numbers are not able to distinguish between exposure amounts being from kVp or mAs
    True
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  • Outside the manufacturers ranges, an image is under or over exposed, regardless of appearance on screen
    True
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  • S numbers are (Inversely or proportionally) related to the amount of exposure to the image receptor in mR
    inversely
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  • Changing your mAs by a factor of 2 (multiply or divide) will change the S# by a factor of _____.
    2
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  • Properly exposed IP should have S number of 15 - 25.
    False (150 - 250)
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  • Kodak uses an exposure system, which is the (DI, EI, S or LgM ?) number
    EI (Exposure Index)
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  • (T or F) Properly exposed images should have an EI ranging from 1,700 – 2,200
    True
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  • Changing your mAs by a factor of 2 will change the EI by _______.
    300
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  • LgM stands for _____________.
    log median exposure
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  • The Higher the LgM #, the ( more or less ) exposure.
    more
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  • Any changes by a factor of 2, will cause a_____ change in the LgM
    0.3
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  • (T or F) LgM numbers are typically 1.95 – 2.5
    True
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  • (T or F) Exposure of the CR plate to light will NOT increase density & may have a minimal impact on the image.
    True
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