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Proceedings Paper

Sensitivity of radiographic screens to scattered radiation
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Paper Abstract

This study compares the relative response of various screen-film and computed radiography (CR) systems to diagnostic radiation exposure. An analytic model was developed to calculate the total energy deposition within the depth of screen and the readout signal generated from this energy for the x-ray detection system. The model was used to predict the relative sensitivity of several screen-film and CR systems to scattered radiation as a function of selected parameters, such as x-ray spectra, phantom thickness, phosphor composition, screen thickness, screen configuration (single front screen, single back screen, screen pair), and readout conditions. Measurements of scatter degradation factor (SDF) for different screen systems were made by using the beam stop technique with water phantoms. Calculated results were found to be consistent with experimental observations, namely, both the BaFBr screen used in a CR system and the CaWO4 screen pair have higher scatter sensitivity than the rare earth Gd2O2S screen pair; the BaFBr screen in the CR front-screen configuration is less sensitive to scatter radiation than in the normal back-screen configuration; and these screens have higher scatter sensitivity as x-ray tube voltage increases.

Paper Details

Date Published: 8 May 1995
PDF: 20 pages
Proc. SPIE 2432, Medical Imaging 1995: Physics of Medical Imaging, (8 May 1995); doi: 10.1117/12.208360
Show Author Affiliations
Kwok Leung Yip, Kodak Health Imaging Systems, Inc. (United States)
Bruce R. Whiting, Kodak Health Imaging Systems, Inc. (United States)
Thomas E. Kocher, Kodak Health Imaging Systems, Inc. (United States)
David P. Trauernicht, Eastman Kodak Co. (United States)
Richard L. Van Metter, Eastman Kodak Co. (United States)

Published in SPIE Proceedings Vol. 2432:
Medical Imaging 1995: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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