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Logistic representation of the sensitometric response of screen–film systems: Empirical validation
Author(s) -
Willis Charles E.,
Bencomo José A.
Publication year - 1990
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596465
Subject(s) - representation (politics) , logistic regression , medical physics , computer science , statistics , optics , medicine , mathematics , physics , politics , political science , law
An empirical logistic model that linearizes the sensitometric response data of screen–film systems over the entire dynamic range of exposures is presented. This linearization is evident when the net optical densities are scaled as fractions of the net saturation density and plotted on commercial logit, probit, or double‐log paper, except under conditions of reciprocity law failure. Weighted linear regression analysis shows that the intercept, but not the slope, depends on the screen–film system used. Previous work indicates that the slope is also independent of development time and photon energy. The model is verified through an analysis of tabulated sensitometric data published by the Center for Devices and Radiological Health.