Sensitivity of radiographic screens to scattered radiation

Kwok Leung Yip; Bruce R. Whiting; Thomas E. Kocher; David P. Trauernicht; Richard L. Van Metter

doi:10.1117/12.208360

8 May 1995 Sensitivity of radiographic screens to scattered radiation

Kwok Leung Yip, Bruce R. Whiting, Thomas E. Kocher, David P. Trauernicht, Richard L. Van Metter

Proceedings Volume 2432, Medical Imaging 1995: Physics of Medical Imaging; (1995) https://doi.org/10.1117/12.208360
Event: Medical Imaging 1995, 1995, San Diego, CA, United States

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.

Citation Download Citation

Kwok Leung Yip, Bruce R. Whiting, Thomas E. Kocher, David P. Trauernicht, and Richard L. Van Metter "Sensitivity of radiographic screens to scattered radiation", Proc. SPIE 2432, Medical Imaging 1995: Physics of Medical Imaging, (8 May 1995); https://doi.org/10.1117/12.208360

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