The new exposure indicator for digital radiography

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This article describes the essential elements of the new standardized exposure indicator (EI) established by the International Electrotechnical Commission for digital radiography systems. First, a review ofthe limitations of the narrow exposure latitude of film screen radiographyis presented followed by the brief description of two digital radiography systems, a computed radiography system and a flatpaneldigital radiography system. These systems feature wide exposure latitude, variable speed class, and image processing to produceimages that appear with the same density regardless of the exposureused and a characteristic EI displayed on images to provide the technologist with some indication of the exposure level to the digital detector. The third point described focussed on the major elements of the standardized EI of the IEC and described them with respect to standardization efforts, deviation index, and the target EI (EIT), responsibilities of both the manufacturers and users. This new standardizedEI is now proportional to the detector exposure andrequires the user to establish EIT values for all examinations in orderto ensure optimization of the dose to the patient without compromisingthe image quality. The values (EI and EIT) can now beused to calculate the DI, which provides immediate feedback tothe technologist as to whether the correct exposure was used for the examination. Finally, an insight into optimization research willbe presented as a means of illustration of a dose-image quality optimizationstrategy that can be used to determine EIT values objectively.
Original languageEnglish
Pages (from-to)144-158
Number of pages15
JournalJournal of Medical Imaging and Radiation Sciences
Issue number2
Publication statusPublished - Jun 2014

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