Linear system models for lag in flat dynamic x-ray detectors

Bernd Menser; Raoul J.M. Bastiaens; Augusto Nascetti; Michael Overdick; Matthias Simon

doi:10.1117/12.594518

20 April 2005 Linear system models for lag in flat dynamic x-ray detectors

Bernd Menser, Raoul J.M. Bastiaens, Augusto Nascetti, Michael Overdick, Matthias Simon

Proceedings Volume 5745, Medical Imaging 2005: Physics of Medical Imaging; (2005) https://doi.org/10.1117/12.594518
Event: Medical Imaging, 2005, San Diego, California, United States

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.

Citation Download Citation

Bernd Menser, Raoul J.M. Bastiaens, Augusto Nascetti, Michael Overdick, and Matthias Simon "Linear system models for lag in flat dynamic x-ray detectors", Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); https://doi.org/10.1117/12.594518

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