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Simulation of the detective quantum efficiency for a hybrid pixel detector
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
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In: Nuclear Instruments and Methods in Physics Research Section AArticle in journal (Refereed) Submitted
URN: urn:nbn:se:uu:diva-92122OAI: oai:DiVA.org:uu-92122DiVA: diva2:165087
Available from: 2004-09-07 Created: 2004-09-07Bibliographically approved
In thesis
1. Modeling the Performance of a Hybrid Pixel Detector for Digital X-ray Imaging
Open this publication in new window or tab >>Modeling the Performance of a Hybrid Pixel Detector for Digital X-ray Imaging
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The development of digital detectors for X-ray imaging in medical diagnostics receives an increasing amount of attention. The detector under development at the Department of Radiation Sciences at Uppsala University is a hybrid pixel detector, which consists of a semiconductor sensor mounted onto a readout chip. The readout chip is capable of performing photon counting and has an externally adjustable threshold.

A simulation tool for the detector and a model applying the linear-systems transfer theory to X-ray hybrid pixel detectors have been developed. Also a characterization of the readout chip has been done. In order to estimate the potential of the detector for diagnostic radiology, we investigate the image quality using the spatial frequency dependent detective quantum efficiency (DQE). By means of the detector simulations, the influence of threshold setting, noise sources, level of exposure and charge sharing on the DQE have been studied. By means of the linear-systems theory, a single analytical expression is provided to obtain the DQE of a hybrid pixel detector.

The method developed in this thesis will make it possible to optimize a detector design according to a particular medical application. It will also permit modifications and new features to be included without having to construct a full detector system.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 45 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1012
Radiation sciences, Hybrid pixel detector, X-ray imaging, simulations, cascaded linear-systems, Strålningsvetenskap
National Category
Radiology, Nuclear Medicine and Medical Imaging
urn:nbn:se:uu:diva-4545 (URN)91-554-6035-6 (ISBN)
Public defence
2004-09-30, Polhemsalen, Ångströmlaboratoriet, Läggerhyddsv. 1, Uppsala, 13:30
Available from: 2004-09-07 Created: 2004-09-07Bibliographically approved

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