8 May 1995 Performance characteristics of high-resolution charge-coupled device film digitizers
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Proceedings Volume 2432, Medical Imaging 1995: Physics of Medical Imaging; (1995); doi: 10.1117/12.208367
Event: Medical Imaging 1995, 1995, San Diego, CA, United States
Abstract
This paper describes the performance characteristics of two high resolution charged-coupled device (CCD) film scanners for radiological imaging. The two models of recently developed CCD film scanners made by DBA Systems have been available on the market for ultra high resolution film digitization. One model of the scanner digitizes the film at 21 micrometers and the other one at 42 micrometers . Both systems can be interfaced to a PC. Line-pair, star-pattern and single edge on films were used to test the spatial resolution in the directions perpendicular and parallel to the CCD scan line. Step wedges generated on films through a mammographic system and print transparencies were employed to test the gray value versus the optical density response and variations on a `uniform area.' Geometric distortion of the digitized images was determined to be negligible at less than 1%. This gray value versus optical density response was linearly plotted from optical density (OD) 0 to 2.8. Depending upon optical density regions, gray value fluctuations varied. Both ultra high resolution CCD scanners showed reasonable performance. However, some digital noises were shown in the high OD range.
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Shih-Chung Benedict Lo, Philip D. Butson, Jyh-Shyan Lin, Huai Li, Matthew T. Freedman, Seong Ki Mun, "Performance characteristics of high-resolution charge-coupled device film digitizers", Proc. SPIE 2432, Medical Imaging 1995: Physics of Medical Imaging, (8 May 1995); doi: 10.1117/12.208367; http://dx.doi.org/10.1117/12.208367
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KEYWORDS
Charge-coupled devices

Scanners

Absorbance

Modulation transfer functions

Mammography

Distortion

Image resolution

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