Effect of secondary radiations on the performance of digital radiographic detectors

Michael J. Flynn; Scott Wilderman; Jerzy Kanicki

doi:10.1117/12.317032

24 July 1998 Effect of secondary radiations on the performance of digital radiographic detectors

Michael J. Flynn, Scott Wilderman, Jerzy Kanicki

Proceedings Volume 3336, Medical Imaging 1998: Physics of Medical Imaging; (1998) https://doi.org/10.1117/12.317032
Event: Medical Imaging '98, 1998, San Diego, CA, United States

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, D_QE(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 D_QE(E,f)/D_QE(E,O) of 10% to 22%.

Citation Download Citation

Michael J. Flynn, Scott Wilderman, and Jerzy Kanicki "Effect of secondary radiations on the performance of digital radiographic detectors", Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); https://doi.org/10.1117/12.317032

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