Fluoroscopic x-ray imaging with amorphous silicon thin-film arrays

Ulrich W. Schiebel; Norbert Conrads; Norbert Jung; Martin Weibrecht; Herfried K. Wieczorek; Thomas T. Zaengel; M. J. Powell; I. D. French; C. Glasse

doi:10.1117/12.174248

1 May 1994 Fluoroscopic x-ray imaging with amorphous silicon thin-film arrays

Ulrich W. Schiebel, Norbert Conrads, Norbert Jung, Martin Weibrecht, Herfried K. Wieczorek, Thomas T. Zaengel, M. J. Powell, I. D. French, C. Glasse

Author Affiliations +

Proceedings Volume 2163, Medical Imaging 1994: Physics of Medical Imaging; (1994) https://doi.org/10.1117/12.174248
Event: Medical Imaging 1994, 1994, Newport Beach, CA, United States

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.

Citation Download Citation

Ulrich W. Schiebel, Norbert Conrads, Norbert Jung, Martin Weibrecht, Herfried K. Wieczorek, Thomas T. Zaengel, M. J. Powell, I. D. French, and C. Glasse "Fluoroscopic x-ray imaging with amorphous silicon thin-film arrays", Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); https://doi.org/10.1117/12.174248

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