Temporal artifacts in flat dynamic x-ray detectors

Michael Overdick; Torsten Solf; Hans-Aloys Wischmann

doi:10.1117/12.430913

28 June 2001 Temporal artifacts in flat dynamic x-ray detectors

Michael Overdick, Torsten Solf, Hans-Aloys Wischmann

Proceedings Volume 4320, Medical Imaging 2001: Physics of Medical Imaging; (2001) https://doi.org/10.1117/12.430913
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

Flat X-ray detectors based on CsI:Tl scintillators and amorphous silicon photodiodes are known to exhibit temporal artefacts (ghost images) which decay over time. Previously, these temporal artefacts have been attributed mainly to residual signals from the amorphous silicon photodiodes. More detailed experiments presented here show that a second class of effects, the so-called gain effects, also contributes significantly to the observed temporal artefacts. Both the residual signals and the photodiode gain effect have been characterized under various exposure conditions in the study presented here. The results of the experiments quantitatively show the decay of the temporal artefacts. Additionally, the influence of the detector's reset light on both effects in the photodiode has been studied in detail. The data from the measurements is interpreted based on a simple trapping model which suggests a strong link between the photodiode residual signals and the photodiode gain effect. For the residual signal effect a possible correction scheme is described. Furthermore, the relevance of the remaining temporal artefacts for the applications is briefly discussed for both the photodiode residual signals and the photodiode gain effect.

Citation Download Citation

Michael Overdick, Torsten Solf, and Hans-Aloys Wischmann "Temporal artifacts in flat dynamic x-ray detectors", Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); https://doi.org/10.1117/12.430913

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