Theoretical considerations of effects of x-ray film-screen characteristics on threshold detectability of small low-contrast objects
- 1 March 1978
- journal article
- research article
- Published by Wiley in Medical Physics
- Vol. 5 (2) , 146-151
- https://doi.org/10.1118/1.594408
Abstract
An expression is derived for visual contrast of a radiographed small object that takes into account the proportion of scattered radiation as well as the shape of the sensitometric curve of the film-screen combination. Based on this expression for visual contrast applied to two different film-screen systems, predictions are made for threshold perceptability of low-contrast objects radiographed with the two imaging systems in the presence of scattered radiation and at different points on the sensitometric curves.Keywords
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