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