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Receptor saturation in roentgen films

Journal Article:

Abstract

Roentgen-film recording of small object details of low attenuation differences (e.g. pulmonary vessels) is regularly seen to be impaired when the film is exposed to yield high values of optical density (D). This high-density failure is due to receptor saturation, which implies that at high exposure values most silver halide grains of the film are made developable, leaving few grains available to receive additional informative photons. The receptor saturation is analysed by means of a mathematical model of a non-screen film yielding Dsub(max) = 2.0. Optimum recording, defined by maximum signal-to-noise ratio in the image, is found at D approximately 0.64, corresponding to, on an average, 1.6 photons absorbed per grain. On the other hand, maximum contrast occurs at D approximately 1.4, where, on the average, 3.6 photons are absorbed per grain. The detective quantum efficiency of the film, i.e. the fraction of the photons actually contributing to the information content of the image, drops from 41 per cent at maximum signal-to-noise ratio to a mere 10 per cent at maximum contrast.
Authors:
Strid, K G; Reichmann, S [1] 
  1. Sahlgrenska Sjukhuset, Goeteborg (Sweden)
Publication Date:
Jan 01, 1980
Product Type:
Journal Article
Reference Number:
AIX-12-627763; EDB-82-032043
Resource Relation:
Journal Name: Acta Radiol., Diagn.; (Sweden); Journal Volume: 21:6
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BIOMEDICAL RADIOGRAPHY; PHOTOGRAPHIC FILM DETECTORS; IMAGES; NOISE; PERFORMANCE; PHOTOGRAPHIC FILMS; X RADIATION; X-RAY DETECTION; DETECTION; DIAGNOSTIC TECHNIQUES; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; MEASURING INSTRUMENTS; MEDICINE; NUCLEAR MEDICINE; RADIATION DETECTION; RADIATION DETECTORS; RADIATIONS; RADIOLOGY; 440105* - Radiation Instrumentation- Radiometric Instruments- (-1987)
OSTI ID:
5893061
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: ACRDA
Submitting Site:
INIS
Size:
Pages: 789-796
Announcement Date:

Journal Article:

Citation Formats

Strid, K G, and Reichmann, S. Receptor saturation in roentgen films. Sweden: N. p., 1980. Web.
Strid, K G, & Reichmann, S. Receptor saturation in roentgen films. Sweden.
Strid, K G, and Reichmann, S. 1980. "Receptor saturation in roentgen films." Sweden.
@misc{etde_5893061,
title = {Receptor saturation in roentgen films}
author = {Strid, K G, and Reichmann, S}
abstractNote = {Roentgen-film recording of small object details of low attenuation differences (e.g. pulmonary vessels) is regularly seen to be impaired when the film is exposed to yield high values of optical density (D). This high-density failure is due to receptor saturation, which implies that at high exposure values most silver halide grains of the film are made developable, leaving few grains available to receive additional informative photons. The receptor saturation is analysed by means of a mathematical model of a non-screen film yielding Dsub(max) = 2.0. Optimum recording, defined by maximum signal-to-noise ratio in the image, is found at D approximately 0.64, corresponding to, on an average, 1.6 photons absorbed per grain. On the other hand, maximum contrast occurs at D approximately 1.4, where, on the average, 3.6 photons are absorbed per grain. The detective quantum efficiency of the film, i.e. the fraction of the photons actually contributing to the information content of the image, drops from 41 per cent at maximum signal-to-noise ratio to a mere 10 per cent at maximum contrast.}
journal = {Acta Radiol., Diagn.; (Sweden)}
volume = {21:6}
journal type = {AC}
place = {Sweden}
year = {1980}
month = {Jan}
}