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Proceedings Paper

Imaging performance and CR film density
Author(s): Walter Huda; Jon L. Williams Jr.; Clifford J. Belden; Jonathan L. Williams Sr.
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Paper Abstract

Detection of low-contrast discs in computed radiography (CR) radiographs of a phantom was investigated as a function of film density. A Leeds Test Object 10 phantom was used that contains discs 0.25 to 11.1 mm in diameter. A series of radiographs was obtained using identical Cr imaging plates exposed to approximately 1 mR. The imaging plates were processed in a CR system using a linear characteristic curve sequentially adjusted to modify the density of the output film while maintaining a constant image contrast. Twelve radiologists viewed the resultant films in a darkened room, indicating the number of discs visible at each hole size. The mean number of discs seen at a constant film density of 1.11 was 58.7 +/- 2.8 out of the total of 108 discs present. Variation in disc visibility between radiologists ranged +/- 30% about the mean value. Optimal imaging performance occurred at a density range of between 0.8 and 1.0. Disc detectability was reduced to 90% of this optimal value at lower and upper film densities of 0.55 and 1.50, respectively.

Paper Details

Date Published: 17 April 1995
PDF: 10 pages
Proc. SPIE 2436, Medical Imaging 1995: Image Perception, (17 April 1995); doi: 10.1117/12.206850
Show Author Affiliations
Walter Huda, Univ. of Florida (United States)
Jon L. Williams Jr., Univ. of Florida (United States)
Clifford J. Belden, Univ. of Florida (United States)
Jonathan L. Williams Sr., Univ. of Florida (United States)


Published in SPIE Proceedings Vol. 2436:
Medical Imaging 1995: Image Perception
Harold L. Kundel, Editor(s)

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