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Proceedings Paper

Screen optics effects on DQE in digital radiography: spatial frequency effects
Author(s): A. R. Lubinsky; W. Zhao; Katsuhiko Suzuki
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Paper Abstract

The effect of screen optics on the spatial-frequency-dependent DQE of digital radiographic systems, expressed as the Lubberts factor L(f), is studied for both isotropic granular and structured columnar (CsI) x-ray screens. Analytical models for L(f) are derived from diffusion theory for isotropic screens, and optical ray tracing methods are also used to obtain depth-dependent line spread functions, MTF's, and Lubberts factors for both isotropic and columnar screens. The theoretical methods are used to investigate the dependence of L(f) on backing reflectance, thickness, x-ray absorption coefficient, and screen type. An experimental method to estimate L(f), in which an electron multiplying charge coupled device (EMCCD) is used to image individual x-ray bursts, is described. Preliminary results are obtained from data on sample screens, and are compared with the theory.

Paper Details

Date Published: 18 March 2008
PDF: 12 pages
Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69134F (18 March 2008); doi: 10.1117/12.772973
Show Author Affiliations
A. R. Lubinsky, SUNY (United States)
W. Zhao, SUNY (United States)
Katsuhiko Suzuki, Hamamatsu Photonics K.K. (Japan)


Published in SPIE Proceedings Vol. 6913:
Medical Imaging 2008: Physics of Medical Imaging
Jiang Hsieh; Ehsan Samei, Editor(s)

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