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Proceedings Paper

Linear system models for lag in flat dynamic x-ray detectors
Author(s): Bernd Menser; Raoul J.M. Bastiaens; Augusto Nascetti; Michael Overdick; Matthias Simon
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Paper Abstract

The detective quantum efficiency (DQE) is regarded as a suitable parameter to assess the global imaging performance of an x-ray detector. However, residual signals increase the signal-to-noise ratio and therefore artificially increase the measured DQE compared to a lag-free system. In this paper, the impact of lag on the DQE is described for two different sources of lag using linear system models. In addition to the commonly used temporal filtering model for trapping, an increase of the dark current is considered as another potential source of lag. It is shown that the assumed lag model has a crucial impact on the choice of an adequate lag estimation method. Examples are given using the direct conversion material PbO. It turns out that the most general approach is the evaluation of the temporal noise power spectrum. A new algorithm is proposed for the crucial issue of robustly estimating the power spectrum at frequency zero.

Paper Details

Date Published: 20 April 2005
PDF: 12 pages
Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); doi: 10.1117/12.594518
Show Author Affiliations
Bernd Menser, Philips Research Labs. (Germany)
Raoul J.M. Bastiaens, Philips Medical Systems (Netherlands)
Augusto Nascetti, Philips Research Labs. (Germany)
Michael Overdick, Philips Research Labs. (Germany)
Matthias Simon, Philips Research Labs. (Germany)

Published in SPIE Proceedings Vol. 5745:
Medical Imaging 2005: Physics of Medical Imaging
Michael J. Flynn, Editor(s)

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