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Proceedings Paper

Fluoroscopic x-ray imaging with amorphous silicon thin-film arrays
Author(s): Ulrich W. Schiebel; Norbert Conrads; Norbert Jung; Martin Weibrecht; Herfried K. Wieczorek; Thomas T. Zaengel; M. J. Powell; I. D. French; C. Glasse
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Paper Abstract

The dream of an all-solid state large area x-ray image sensor with digital readout and full dynamic performance will most probably find a first realization in 2D thin-film amorphous silicon arrays. In this paper we address in particular the evaluation of the limits of the signal/noise ratio in this concept. Using small prototype detectors measurements of MTF and noise power spectra have been made as a function of x-ray dose. The results are given in terms of the detective quantum efficiency as a function of dose and spatial frequency. We further present an analysis of the different noise sources and their dependence on the detector parameters, and we provide estimates on the maximum signals that may be achieved per unit dose. The intrinsic lag of the amorphous silicon photodiodes causes a second problem area with this type of x-ray detectors. Especially in radiography/fluoroscopy mixed applications, memory effects may not be negligible.

Paper Details

Date Published: 1 May 1994
PDF: 12 pages
Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); doi: 10.1117/12.174248
Show Author Affiliations
Ulrich W. Schiebel, Philips Research Labs./Aachen (Germany)
Norbert Conrads, Philips Research Labs./Aachen (Germany)
Norbert Jung, Philips Research Labs./Aachen (Germany)
Martin Weibrecht, Philips Research Labs./Aachen (Germany)
Herfried K. Wieczorek, Philips Research Labs./Aachen (Germany)
Thomas T. Zaengel, Philips Research Labs./Aachen (Germany)
M. J. Powell, Philips Research Labs./Surrey (United Kingdom)
I. D. French, Philips Research Labs./Surrey (United Kingdom)
C. Glasse, Philips Research Labs./Surrey (United Kingdom)

Published in SPIE Proceedings Vol. 2163:
Medical Imaging 1994: Physics of Medical Imaging
Rodney Shaw, Editor(s)

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