Abstract
This chapter addressed essential features of the international standardized EI for DR imaging systems. First, two “old” propriety scales for the EI, the inverse scale and the proportional scale, were reviewed briefly followed by an outline of a generalized method for determining the EI. The next topic described are three conditions for the IEC standardized EI that must be met: (a) the standardized EI is related to the detector exposure and the standardized EI is obtained from the pixel values in the region of interest, (b) the standardized EI uses a linear proportional scale related to the detector exposure/signal (i.e., doubling the detector dose doubles the standardized EI value), and (c) consideration of the radiation beam quality (kVp, half-value layer, and added filtration) used for the calibration of the EI and the precision of the scale. Additionally, selected terminology of the IEC standardized EI are defined and include the exposure index (EI), the target EI (EIT), deviation index (DI), and the value of interest (VOI).
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