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British Journal of Radiology (1996) 69, 153-159
© 1996 British Institute of Radiology
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The British Journal of Radiology, Vol 69, Issue 818 153-159, Copyright © 1996 by British Institute of Radiology

ARTICLES

An experimental investigation of the effect of light-box luminance on the detection of low contrast objects in mammography

KJ Robson, CJ Kotre and K Faulkner
Regional Medical Physics Department, Newcastle General Hospital, Newcastle upon Tyne UK.

It has been hypothesized that light-box luminance is an important factor in the detection of objects on radiographs. In this work, existing psychophysical data relating to the measurement of visual thresholds at various scene luminance levels are applied to the problem of the observation of radiographs on a light-box. These data suggest that for a given stimulus size, the threshold contrast varies little over several orders of magnitude of scene luminance. In a series of contrast detail experiments performed over a wide range of light-box luminances it has been demonstrated that the detection of low contrast objects on mammographic film is dominated by external noise, that is noise on the film, rather than the internal visual noise of the observer. It is therefore suggested that in mammography it is inappropriate to base recommendations for optimal values of light-box luminance on psychophysical studies of visual noise. It has been shown that commonly used light-box luminances are suitable for viewing mammograms at the higher average optical densities now being recommended, provided that precautions are taken to avoid glare and reflection.


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K J ROBSON
An investigation into the effects of suboptimal viewing conditions in screen-film mammography
Br. J. Radiol., March 1, 2008; 81(963): 219 - 231.
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