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Abstract
The design of radiographic systems supposes the existence of objective evaluation methods. Such methods can generally be divided into two classes: (1) sensitometry, and (2) image quality evaluation.
The comparative study of the merits of black-and-white and colour radiographic systems requires more general evaluation methods.
The method used in our laboratory is essentially an adapted visibility test, organized in such a way as to permit a precise objective interpretation.
The results obtained thus far are now being correlated with a comprehensive image quality criterion, based on our actual knowledge of vision, on the image transfer theory and on a decision theory.
This criterion contains all important characteristics of the radiographic system, including the human visual sense. As an example, this evaluation method is applied to the Medichrome system and the results are briefly discussed.
Notes
Paper presented at a conference on “New Trends in Radiography” organized by the Science Committee of the Royal Photographic Society, 8-9 December 1970 in London.