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Proceedings Paper

Resolution Properties Of A Computed Radiographic System
Author(s): Hiroshi Fujita; Junji Morishita; Katsuhiko Ueda; Du Yih Tsai; Akiyoshi Ohtsuka; Tsuyoshi Fujikawa
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Paper Abstract

The analysis of spatial-resolution properties in terms of the modulation transfer function (MTF) has been presented in a computed radiographic (CR) system (FCR-101) with the photostimulable-phosphor plate (imaging plate, IP). The newly devised method of determining the presampling MTF which includes the x-ray detector (IP) unsharpness and the unsharpness of the sampling aperture is described in which an image of a slightly-angulated lead slit relative to a horizontal or vertical direction is employed. The IP MTFs as an analog MTF in the system, the presampling MTFs for different types of IPs, different sampling distances, different versions of IPs, simultaneous multisection tomography and magnification radiography, and the laser-printer MTFs as display MTF are measured and shown. The effective sampling aperture MTFs calculated indicate that the noticeable degradation of resolution occurs at the stage of image data sampling. The usefulness of the magnification technique for mammography and bone radiography is demonstrated. It is shown that both of the digital MTF and the overall MTF are difficult to use for general purpose due to the aliasing artifacts. The effect of glare on the contrast is also characterized by lead-disk method. The glare fraction is found to be approximately 6.5%.

Paper Details

Date Published: 1 May 1989
PDF: 13 pages
Proc. SPIE 1090, Medical Imaging III: Image Formation, (1 May 1989); doi: 10.1117/12.953211
Show Author Affiliations
Hiroshi Fujita, Gifu National College of Technology (Japan)
Junji Morishita, Yamaguchi University Hospital (Japan)
Katsuhiko Ueda, Yamaguchi University Hospital (Japan)
Du Yih Tsai, Gifu College of Medical Technology (Japan)
Akiyoshi Ohtsuka, Yamaguchi University Hospital (Japan)
Tsuyoshi Fujikawa, Onoda Red Cross Hospital (Japan)

Published in SPIE Proceedings Vol. 1090:
Medical Imaging III: Image Formation
Samuel J. Dwyer; R. Gilbert Jost; Roger H. Schneider, Editor(s)

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