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Proceedings Article

Dynamic x-ray imaging system based on an amorphous silicon thin-film array

[+] Author Affiliations
Norbert Jung, Falko Busse, Norbert Conrads, Walter Ruetten, Ulrich W. Schiebel, Martin Weibrecht, Herfried K. Wieczorek

Philips Research Labs. (Germany)

P. L. Alving

Philips Medical Systems (Netherlands)

Henk J. Meulenbrugge

Philips Medical Systems/Best (Netherlands)

Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, 396 (July 24, 1998); doi:10.1117/12.317040
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From Conference Volume 3336

  • Medical Imaging 1998: Physics of Medical Imaging
  • James T. Dobbins III; John M. Boone
  • San Diego, CA | February 21, 1998

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.

© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Norbert Jung ; P. L. Alving ; Falko Busse ; Norbert Conrads ; Henk J. Meulenbrugge, et al.
"Dynamic x-ray imaging system based on an amorphous silicon thin-film array", Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, 396 (July 24, 1998); doi:10.1117/12.317040; http://dx.doi.org/10.1117/12.317040


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