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Contrast‐detail‐Dose and dose efficiency analysis of a scanning digital and a screen‐film‐grid radiographic system
Author(s) -
Cohen Gerald,
Wagner Louis K.,
Amtey Sharad R.,
Di Bianca Frank A.
Publication year - 1981
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 - 10.1118/1.594958
Subject(s) - digital radiography , radiography , computed radiography , contrast (vision) , attenuation , detective quantum efficiency , nuclear medicine , optics , medical imaging , dosimetry , computer science , image quality , materials science , physics , computer vision , medicine , artificial intelligence , radiology , image (mathematics)
The purpose of this study is to examine the diagnostic potential of a scanning digital radiography (SDR) system currently used clinically as a CT localization device. The technique of contrast‐detail‐dose analysis is used to compare the low‐contrast sensitivity and dose efficiency of an SDR unit with standard radiography (SR). The theory of threshold perceptibility in both digital radiography and SR is described, including the effects of scattered radiation and antiscatter devices, object attenuation, geometry, system image processing, and recorder quantum efficiency. The concept of dose efficiency is defined and derived from the contrast‐detail‐dose data. The SDR system is shown to operate with a threshold signal‐to‐noise ratio of 7.3±1.2 for large area detection ( d ≳2 mm); to be relatively scatter‐free; and to be as much as 100× more dose efficient than SR for visualization of large low contrast objects ( C ≲0.04, d ≳2 mm).