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Modeling the Performance of a Hybrid Pixel Detector for Digital X-ray Imaging
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
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. , p. 45
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1012
Keywords [en]
Radiation sciences, Hybrid pixel detector, X-ray imaging, simulations, cascaded linear-systems
Keywords [sv]
Strålningsvetenskap
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:uu:diva-4545ISBN: 91-554-6035-6 (print)OAI: oai:DiVA.org:uu-4545DiVA, id: diva2:165089
Public defence
2004-09-30, Polhemsalen, Ångströmlaboratoriet, Läggerhyddsv. 1, Uppsala, 13:30
Opponent
Supervisors
Available from: 2004-09-07 Created: 2004-09-07Bibliographically approved
List of papers
1. Calculation of the modulation transfer function for the X-ray imaging detector DIXI using Monte Carlo simulation data
Open this publication in new window or tab >>Calculation of the modulation transfer function for the X-ray imaging detector DIXI using Monte Carlo simulation data
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2001 In: Nuclear Instruments and Methods in Physics Research Section A, ISSN 0168-9002, Vol. 466, no 1, p. 209-217Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92119 (URN)
Available from: 2004-09-07 Created: 2004-09-07Bibliographically approved
2. Tuning Tool for Image Quality Optimization of a Hybrid Semiconductor Detector
Open this publication in new window or tab >>Tuning Tool for Image Quality Optimization of a Hybrid Semiconductor Detector
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2004 In: IEEE Transactions on Nuclear Science, ISSN 0018-9499, Vol. 51, no 1, p. 105-109Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92120 (URN)
Available from: 2004-09-07 Created: 2004-09-07Bibliographically approved
3. Performance of a chip for hybrid pixel detectors with two counters for X-ray imaging
Open this publication in new window or tab >>Performance of a chip for hybrid pixel detectors with two counters for X-ray imaging
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2004 (English)In: Proceedings of the 5th International Workshop on Radiation Imaging Detectors / [ed] Gostilo, Vladimir, 2004, Vol. 531, p. 215-220Conference paper, Published paper (Refereed)
Abstract [en]

A semiconductor hybrid pixel detector for dynamic X-ray imaging is developed. The detector, called DIXI, consists of a semiconductor sensor mounted onto a readout chip. A detector module with a silicon sensor is currently being assembled with the use of anisotropic conductive film as interconnection between the sensor and the readout chip. The basic building block of the detector is in size and consists of 992 square pixel cells arranged in 31 columns and 32 rows. The pixels have a side of . The readout chip is capable of performing photon counting and has an externally adjustable threshold. The readout chip has been characterised by charge injection in the absence of a sensor. The threshold dispersion is measured to 365 e for hole collection. Even if the chip was not originally designed for electron collection a threshold dispersion of 1650 e has been achieved. Two counters are implemented in every single pixel cell and the threshold can be changed from one image to the next in order to select different parts of the X-ray spectrum.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-92121 (URN)10.1016/j.nima.2004.06.008 (DOI)
Conference
5th International Workshop on Radiation Imaging Detectors, 7 - 11 Sep 2003, Riga, Latvia
Available from: 2004-09-07 Created: 2004-09-07 Last updated: 2013-09-13Bibliographically approved
4. Simulation of the detective quantum efficiency for a hybrid pixel detector
Open this publication in new window or tab >>Simulation of the detective quantum efficiency for a hybrid pixel detector
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In: Nuclear Instruments and Methods in Physics Research Section AArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-92122 (URN)
Available from: 2004-09-07 Created: 2004-09-07Bibliographically approved
5. Cascaded linear system model for a hybrid X-ray imaging pixel detector
Open this publication in new window or tab >>Cascaded linear system model for a hybrid X-ray imaging pixel detector
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2004 In: TSL/ISV Report Series, ISSN 0284-2769, no 0280Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92123 (URN)
Available from: 2004-09-07 Created: 2004-09-07Bibliographically approved

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