Quality control of radiographic illuminators and associated viewing equipment

Conditions for viewing radiological images should be adapted to the characteristics of the radiographic films as they can influence the diagnostic accuracy and detection of threshold contrasts of smaller diagnostically important structures. Since the optimal detection of small contrast details and small structures lies in the region of 1000 cd m-2, this value should be met by the viewing conditions. Data on test procedures, frequency of tests, optimum light intensities and tolerance criteria are given, based on existing recommendations. Procedures for testing the viewing conditions should be included in quality assurance programmes. (author)