Influence Of Ambient Light On The "Visual" Sensitometric Properties Of, And Detail Perception On, A Radiograph

Romain Bollen; Jean Vranckx

doi:10.1117/12.931782

16 July 1981 Influence Of Ambient Light On The "Visual" Sensitometric Properties Of, And Detail Perception On, A Radiograph

Romain Bollen, Jean Vranckx

Author Affiliations +

Proceedings Volume 0273, Application of Optical Instrumentation in Medicine IX; (1981) https://doi.org/10.1117/12.931782
Event: Application of Optical Instrumentation in Medicine, 1981, San Francisco, United States

Abstract

Lack of perception at high densities on radiographs and the influence of viewing conditions on it are well known. This lack may be caused by blinding effects, by high visual noise at low light intensities or by a third phenomenon i.e. the dependence of the sensitometric properties of film on viewing conditions, which is analyzed in this paper. Reflection of ambient light by the film mainly lowers dramatically high densities and film contrast at these densities. Sensitometric curves of several films were measured under different viewing conditions by means of a telescopic photometer. The curves also can be deduced from curves measured by a regular densitometer when the optical properties of the film, the ambient light level and the light intensity of the negatoscope are known. The influence of the phenomenon under typical viewing conditions for the Curix MR4-film is demonstrated by means of sensitometric- and perceptibility-curves.

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Romain Bollen and Jean Vranckx "Influence Of Ambient Light On The "Visual" Sensitometric Properties Of, And Detail Perception On, A Radiograph", Proc. SPIE 0273, Application of Optical Instrumentation in Medicine IX, (16 July 1981); https://doi.org/10.1117/12.931782

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