This guidance should assist medical physicists who survey facilities that have daylight system processors for mammography.
In a normal darkroom setting, this test involves feeding two films at two different orientations into the processor (one film along the long dimension and another film along the short dimension). In the daylight processor case, using a large cassette and the same enclosure that the facility uses for loading the magazines:
a) Load a small (18 x 24 cm) film in the cassette so that its long dimension is parallel to the long dimension of the cassette, follow the recommended normal artifact test procedure to expose the film, and place the cassette in the daylight system for processing.
b) After the film has been processed, load another small film transversely in the same large cassette so as to occupy only half the cassette. Expose the new film by following the rest of the steps in the recommended procedures for the artifact test, and place the cassette in the daylight system to process the new film.
Artifact analysis on the two films can then be done in the same manner as for manually loaded cassettes.