Mr. Christer Ullberg Profile

Christer Ullberg

Chief Technology Officer at Directconversion

SPIE Involvement:

Author

Area of Expertise:

X-ray , Electronics , Photon counting , ASIC

Websites:

Company Website

CTO at XCounter, developing state of the art photon counting digital X-ray detectors.
Board member at Oy AJAT Ltd. Development and manufacturing of CdTe sensors and dental systems.

Proceedings Article | 4 April 2022 Presentation + Paper

Measurements on a novel 4-side buttable photon counting ASIC with integrating charge sharing correction

Christer Ullberg, Mattias Urech, Leif Adelöw, Niclas Weber

Proceedings Volume 12031, 120310D (2022) https://doi.org/10.1117/12.2611482

KEYWORDS: Sensors, Photon counting, Modulation transfer functions, X-rays, Americium, Cerium, Cadmium, X-ray computed tomography, Spatial resolution, Optical filters

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Proceedings Article | 9 March 2018 Presentation + Paper

Photon counting dual energy x-ray imaging at CT count rates: measurements and implications of in-pixel charge sharing correction

Christer Ullberg, Mattias Urech, Charlotte Eriksson, Alexander Stewart, Niclas Weber

Proceedings Volume 10573, 1057319 (2018) https://doi.org/10.1117/12.2293591

KEYWORDS: X-rays, Sensors, Dual energy imaging, Photon counting, X-ray imaging, Aluminum, Polymethylmethacrylate, X-ray computed tomography, Cadmium

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SPIE Journal Paper | 3 October 2014 Open Access

Analysis of iterative region-of-interest image reconstruction for x-ray computed tomography

Emil Sidky, David Kraemer, Erin Roth, Christer Ullberg, Ingrid Reiser, Xiaochuan Pan

JMI, Vol. 1, Issue 03, 031007, (October 2014) https://doi.org/10.1117/12.10.1117/1.JMI.1.3.031007

KEYWORDS: X-ray computed tomography, Image restoration, Reconstruction algorithms, Algorithm development, CT reconstruction, Data modeling, Image filtering, Optimization (mathematics), Medical imaging, X-rays

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Proceedings Article | 6 March 2013 Paper

Measurements of a dual-energy fast photon counting CdTe detector with integrated charge sharing correction

Christer Ullberg, Mattias Urech, Niclas Weber, Anders Engman, Anna Redz, Fredrik Henckel

Proceedings Volume 8668, 86680P (2013) https://doi.org/10.1117/12.2007892

KEYWORDS: Sensors, Modulation transfer functions, Photon counting, Monte Carlo methods, X-rays, Dual energy imaging, X-ray imaging, Polymethylmethacrylate, Aluminum, Image resolution

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Proceedings Article | 19 March 2010 Paper

Development of a 3D high-resolution physical anthropomorphic breast phantom

Ann-Katherine Carton, Predrag Bakic, Christer Ullberg, Andrew D. Maidment

Proceedings Volume 7622, 762206 (2010) https://doi.org/10.1117/12.845367

KEYWORDS: Breast, Tissues, Digital breast tomosynthesis, X-ray imaging, Skin, Prototyping, X-rays, Iodine, Rapid manufacturing, 3D image processing

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Proceedings Article | 16 March 2007 Paper

Dual-energy subtraction for contrast-enhanced digital breast tomosynthesis

Ann-Katherine Carton, Karin Lindman, Christer Ullberg, Tom Francke, Andrew Maidment

Proceedings Volume 6510, 651007 (2007) https://doi.org/10.1117/12.713703

KEYWORDS: Breast, Image filtering, Tomography, Copper, Iodine, Tin, Sensors, Tissues, Magnesium, Signal to noise ratio

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Proceedings Article | 2 March 2006 Paper

Evaluation of a photon-counting breast tomosynthesis imaging system

Andrew Maidment, Christer Ullberg, Karin Lindman, Leif Adelöw, Johan Egerström, Mathias Eklund, Tom Francke, Ulf Jordung, Tomas Kristoffersson, Lars Lindqvist, Daniel Marchal, Hans Olla, Erik Penton, Juha Rantanen, Skiff Solokov, Niclas Weber, Hans Westerberg

Proceedings Volume 6142, 61420B (2006) https://doi.org/10.1117/12.654651

KEYWORDS: Modulation transfer functions, Breast, Sensors, Image quality, Tomography, Mammography, X-rays, Imaging systems, Tissues, Clinical trials

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Proceedings Article | 20 April 2005 Paper

Evaluation of a photon-counting breast tomosynthesis imaging system

Andrew Maidment, Michael Albert, Stefan Thunberg, Leif Adelow, Ola Blom, Johan Egerstrom, Mathias Eklund, Tom Francke, Ulf Jordung, Tomas Kristoffersson, Karin Lindman, Lars Lindqvist, Daniel Marchal, Hans Olla, Erik Penton, Juha Rantanen, Skiff Solokov, Christer Ullberg, Niclas Weber

Proceedings Volume 5745, (2005) https://doi.org/10.1117/12.597317

KEYWORDS: Sensors, Modulation transfer functions, Imaging systems, X-rays, Computer simulations, Image quality, Image restoration, X-ray detectors, Breast, Tungsten

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Proceedings Article | 6 May 2004 Paper

Dose reduction in mammography with photon counting imaging

Stefan Thunberg, Leif Adelow, Ola Blom, Anders Coster, Johan Egerstrom, Mathias Eklund, Per Egnell, Tom Francke, Ulf Jordung, Tomas Kristoffersson, Karin Lindman, Lars Lindqvist, Daniel Marchal, Hans Olla, Erik Penton, Vladimir Peskov, Juha Rantanen, Skiff Sokolov, Per Svedenhag, Christer Ullberg, Niclas Weber

Proceedings Volume 5368, (2004) https://doi.org/10.1117/12.530649

KEYWORDS: Polymethylmethacrylate, Image quality, Sensors, Mammography, Photon counting, Digital mammography, Imaging systems, X-rays, X-ray detectors, Breast

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Proceedings Article | 3 May 2002 Paper

Evaluation of a photon-counting mammography system

Stefan Thunberg, Tom Francke, Johan Egerstrom, Mathias Eklund, Leif Ericsson, Thomas Kristoffersson, Vladimir Peskov, Juha Rantanen, Skiff Sokolov, Per Svedenhag, Christer Ullberg, Niclas Weber

Proceedings Volume 4682, (2002) https://doi.org/10.1117/12.465560

KEYWORDS: Sensors, Breast, Imaging systems, X-rays, Photon counting, Mammography, Image quality, Digital x-ray imaging, Digital mammography, X-ray imaging

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Proceedings Article | 28 June 2001 Paper

Dose reduction using photon-counting x-ray imaging

Tom Francke, Mathias Eklund, Leif Ericsson, Thomas Kristoffersson, Vladimir Peskov, Juha Rantanen, Skiff Sokolov, Jan Soderman, Christer Ullberg, Niclas Weber

Proceedings Volume 4320, (2001) https://doi.org/10.1117/12.430920

KEYWORDS: Photon counting, Sensors, X-ray imaging, X-rays, Signal to noise ratio, X-ray detectors, Image resolution, Digital x-ray imaging, Head, X-ray technology

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