Exposure index

Indicator displayed on digital radiography equipment (computed radiography or digital radiography) related to the image quality level and exposure of the image receptor. EI was manufacturer-specific until an international standardised EI was developed by the International Electrotechnical Commission (IEC) and the American Association of Physicists in Medicine (AAPM). Also called ‘Detector dose indicator (DDI)’.

(from ICRP Publication 135, 2017)

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