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Proceedings Paper

Dynamic x-ray imaging system based on an amorphous silicon thin-film array
Author(s): Norbert Jung; P. Lex Alving; Falko Busse; Norbert Conrads; Henk J. Meulenbrugge; Walter Ruetten; Ulrich W. Schiebel; Martin Weibrecht; Herfried K. Wieczorek
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Paper Abstract

In this paper we address design concepts and performance characterization with our laboratory x-ray detector system. Key component is a 1k2 pixel TFT switched photodiode array with a pixel pitch of 200 micrometer. It is built of a-Si:H with a CsI:Tl scintillator layer. The detector system can be used for radiography and fluoroscopy applications with up to 30 images/s. It shows a S/N-ratio better than 23dB at a dose of 10nGy/frame and reaches a value for DQE of more than 60% at low spatial frequencies. We have developed a new evaporation process for CsI:Tl deposition directly on the array. It yields an x-ray sensitivity close to the theoretical limit and a spatial resolution on a sufficiently high level. An optimized plate design in combination with a dedicated charge sensitive readout amplifier chip lead to a very low level of electronic noise. In particular sources and properties of electronic noise and signal crosstalk have shown to be crucial for the clinical use of the new technology. The visual impression of the remaining noise in the images from our system is isotropic. This means especially that synchronous noise has been reduced to the edge of visibility.

Paper Details

Date Published: 24 July 1998
PDF: 12 pages
Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); doi: 10.1117/12.317040
Show Author Affiliations
Norbert Jung, Philips Research Labs. (Germany)
P. Lex Alving, Philips Medical Systems (Netherlands)
Falko Busse, Philips Research Labs. (Germany)
Norbert Conrads, Philips Research Labs. (Germany)
Henk J. Meulenbrugge, Philips Medical Systems/Best (Netherlands)
Walter Ruetten, Philips Research Labs. (Germany)
Ulrich W. Schiebel, Philips Research Labs. (Germany)
Martin Weibrecht, Philips Research Labs. (Germany)
Herfried K. Wieczorek, Philips Research Labs. (Germany)

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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