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This Concept Map, created with IHMC CmapTools, has information related to: Shan R, L. Teachey, Melonie S. CMAP, Exposure Indicator may be Konica System, Agfa Systems changes LgM to correlate with a change in speed, LgM stands for Logarithm of the median, Speed class such as 100 speed, Digital Systems based upon image contrast, Exposure digital systems indicate by Exposure Indicator, "S" number inverse linear relationship to Receptor Exposure, Screen film based upon Adaquate Contrast, Adaquate Contrast controlled by kVp, Sensitivity number also used by Phillips, Digital Exposure Principles when using Screen film, Sensitivity number also used by Fuji, Digital Systems based upon Proper brightness, 200 speed requires Less exposure, "S" number stands for Sensitivity number, LgM optimal range falls between 1.9 and 2.2, Exposure Indicator errors caused by Histogram analysis errors, 100 speed equivalent to 2 mR of exposure, 100 speed requires More exposure, image contrast controlled by image processing