Imaging performance and CR film density

Walter Huda; Jon L. Williams Jr.; Clifford J. Belden; Jonathan L. Williams Sr.

doi:10.1117/12.206850

17 April 1995 Imaging performance and computed radiography (CR) film density

Walter Huda, Jon L. Williams Jr., Clifford J. Belden, Jonathan L. Williams Sr.

Proceedings Volume 2436, Medical Imaging 1995: Image Perception; (1995) https://doi.org/10.1117/12.206850
Event: Medical Imaging 1995, 1995, San Diego, CA, United States

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.

Citation Download Citation

Walter Huda, Jon L. Williams Jr., Clifford J. Belden, and Jonathan L. Williams Sr. "Imaging performance and computed radiography (CR) film density", Proc. SPIE 2436, Medical Imaging 1995: Image Perception, (17 April 1995); https://doi.org/10.1117/12.206850

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