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Proceedings Paper

Signal-to-noise performance in cesium iodide x-ray fluorescent screens
Author(s): Walter Hillen; W. Eckenbach; Peter Quadflieg; Thomas T. Zaengel
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Paper Abstract

The signal-transfer and noise behavior of cesium iodide (CsI) layers, which are used as input screens of X-ray image intensifiers, have been investigated. Experimentally the performance of the CsI screen has been studied with a laboratory-type X-ray image intensifier as well as with a medical device. The scintillation spectrum (gain distribution), the spatial resolution (MTF), the image noise and the corresponding signal-to-noise (S/N) ratios have been determined. The measurements show that the DQE of the X-ray image intensifier is almost exclusively determined by the input screen performance for a wide range of spatial frequencies. The experimental data are compared with the results of a simulation. The screen model includes the primary X-ray absorption process, the effects of K-fluorescence escape and reabsorption, as well as the optical properties of the dedicated (needlelike) CsI screen structure. The simulated signal-to-noise (S/N) ratios are in good agreement with the experimental results. The analysis shows the influence of the various physical processes on the S/N-performance of the screen. The observed drop of the DQE below the absorption limit, which is most pronounced at higher spatial frequencies, is strongly related to the escape and the reabsorption of K-fluorescence.

Paper Details

Date Published: 1 July 1991
PDF: 12 pages
Proc. SPIE 1443, Medical Imaging V: Image Physics, (1 July 1991); doi: 10.1117/12.43435
Show Author Affiliations
Walter Hillen, Philips GmbH Research Lab. Aachen (Germany)
W. Eckenbach, Philips GmbH Research Lab. Aachen (Germany)
Peter Quadflieg, Philips GmbH Research Lab. Aachen (Germany)
Thomas T. Zaengel, Philips GmbH Research Lab. Aachen (Germany)

Published in SPIE Proceedings Vol. 1443:
Medical Imaging V: Image Physics
Roger H. Schneider, Editor(s)

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