An Analysis Of The Fundamental Limitations Of Screen-Film Systems For X-Ray Detection I. General Theory

Rodney Shaw; Richard L VanMetter

doi:10.1117/12.939323

15 June 1984 An Analysis Of The Fundamental Limitations Of Screen-Film Systems For X-Ray Detection I. General Theory

Rodney Shaw, Richard L VanMetter

Proceedings Volume 0454, Application of Optical Instrumentation in Medicine XII; (1984) https://doi.org/10.1117/12.939323
Event: Application of Optical Instrumentation in Medicine XII, 1984, San Diego, United States

Abstract

A model is developed for the overall DQE of an x-ray screen-film system, and this is related to the component DQE's of the screen and film. The model characterizes the screen in terms of its x-ray absorption efficiency, MTF, and the statistics associated with the conversion of absorbed x-rays to emitted light photons. This model establishes that the film need be characterized solely by its DQE with respect to the emitted light photons. We show that the only explicit exposure dependence of the screen-film DQE results from the film DQE, while the spatial-frequency dependence is dominated by the screen MTF. However, depending on the screen gain, a significant exposure/spatial-frequency domain may exist where the overall DQE is independent of both of these factors and depends mainly on x-ray absorption efficiency.

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Rodney Shaw and Richard L VanMetter "An Analysis Of The Fundamental Limitations Of Screen-Film Systems For X-Ray Detection I. General Theory", Proc. SPIE 0454, Application of Optical Instrumentation in Medicine XII, (15 June 1984); https://doi.org/10.1117/12.939323

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