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Proceedings Paper

Effect of secondary radiations on the performance of digital radiographic detectors
Author(s): Michael J. Flynn; Scott Wilderman; Jerzy Kanicki
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Paper Abstract

Blur and noise in radiographs are caused in part by the transport of fluorescent radiation in imaging detectors. We have studied this effect using a Monte Carlo radiation transport analysis which tracks radiations associated with K, L, and M shell transitions. Energy deposition distributions are accumulated which permit computation of the large area energy absorption and noise characteristics. Additionally, the spatial distribution of deposited energy is evaluated in a manner which permits determination of the line spread function and the auto-correlation function. The frequency dependent detective quantum efficiency, DQE(E,f), is subsequently determined by Fourier analysis. This novel method is illustrated by considering the response of a selenium direct digital detector to 120 keV x-rays. It is shown that fluorescent radiations associated with the composition of glass substrates cause a frequency dependent drop in DQE(E,f)/DQE(E,O) of 10% to 22%.

Paper Details

Date Published: 24 July 1998
PDF: 11 pages
Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); doi: 10.1117/12.317032
Show Author Affiliations
Michael J. Flynn, Henry Ford Health System and Univ. of Michigan (United States)
Scott Wilderman, Univ. of Michigan (United States)
Jerzy Kanicki, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 3336:
Medical Imaging 1998: Physics of Medical Imaging
James T. Dobbins; John M. Boone, Editor(s)

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