Dr. Dirk X. Meier Profile

Dr. Dirk X. Meier

Senior Scientist at Integrated Detector Electronics AS

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Author

Publications (11)

Proceedings Article | 19 July 2016 Open Access

Front-end readout ASIC for charged particle counting with the RADEM instrument on the ESA JUICE mission

Timo Stein, Philip Påhlsson, Dirk Meier, Amir Hasanbegovic, Hans Kristian Otnes Berge, Mehmet Akif Altan, Jörg Ackermann, Bahram Najafiuchevler, Suleyman Azman, Jahanzad Talebi, Alf Olsen, Codin Gheorghe, David Steenari, Petter Øya, Tor Magnus Johansen, Gunnar Maehlum

Proceedings Volume 9905, 990546 (2016) https://doi.org/10.1117/12.2231901

KEYWORDS: Sensors, Particles, Electrons, Gamma radiation, Monte Carlo methods, Spectroscopy, Spatial resolution, Stars, Clouds, Aluminum

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Proceedings Article | 20 May 2016 Paper

NIRCA ASIC for the readout of focal plane arrays

Philip Påhlsson, David Steenari, Petter Øya, Hans Kristian Otnes Berge, Dirk Meier, Alf Olsen, Amir Hasanbegovic, Mehmet Altan, Bahram Najafiuchevler, Jahanzad Talebi, Suleyman Azman, Codin Gheorghe, Jörg Ackermann, Gunnar Mæhlum, Tor Magnus Johansen, Timo Stein

Proceedings Volume 9819, 98192C (2016) https://doi.org/10.1117/12.2223619

KEYWORDS: Analog electronics, Readout integrated circuits, Cryogenics, Electronics, Mercury cadmium telluride, Staring arrays, Clocks, Temperature metrology, Sensors, Prototyping

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Proceedings Article | 4 June 2015 Paper

Preliminary validation results of an ASIC for the readout and control of near-infrared large array detectors

Philip Påhlsson, Dirk Meier, Hans Kristian Otnes Berge, Petter Øya, David Steenari, Alf Olsen, Amir Hasanbegovic, Mehmet Altan, Bahram Najafiuchevler, Jahanzad Talebi, Suleyman Azman, Codin Gheorghe, Jörg Ackermann, Gunnar Mæhlum

Proceedings Volume 9451, 94512J (2015) https://doi.org/10.1117/12.2180439

KEYWORDS: Clocks, Readout integrated circuits, Analog electronics, Sensors, Resistors, Electronics, Mercury cadmium telluride, Image sensors, Temperature metrology, Synthetic aperture radar

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Proceedings Article | 23 July 2014 Paper

Development of an ASIC for the readout and control of near-infrared large array detectors

Dirk Meier, Hans Kristian Otnes Berge, Amir Hasanbegovic, Mehmet Altan, Bahram Najafiuchevler, Suleyman Azman, Jahanzad Talebi, Alf Olsen, Petter Øya, Philip Paahlsson, Codin Gheorghe, Gunnar Maehlum

Proceedings Volume 9154, 915421 (2014) https://doi.org/10.1117/12.2055839

KEYWORDS: Readout integrated circuits, Resistors, Sensors, Amplifiers, Clocks, Capacitors, Synthetic aperture radar, Mercury cadmium telluride, Cryogenics, Power supplies

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Proceedings Article | 15 September 2011 Paper

High-performance imaging of stem cells using single-photon emissions

Douglas Wagenaar, Rex Moats, Neal Hartsough, Dirk Meier, James Hugg, Tang Yang, Dan Gazit, Gadi Pelled, Bradley Patt

Proceedings Volume 8143, 81430F (2011) https://doi.org/10.1117/12.897497

KEYWORDS: Sensors, Microscopes, Coded apertures, Silicon, Gamma radiation, Stem cells, Gold, Microscopy, In vivo imaging, Calibration

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Proceedings Article | 17 March 2011 Paper

Basic design and simulation of a SPECT microscope for in vivo stem cell imaging

Rex Moats, Yang Tang, James Hugg, Dirk Meier, David Koos, Neal Hartsough, Bradley Patt, Douglas Wagenaar

Proceedings Volume 7961, 79614B (2011) https://doi.org/10.1117/12.878427

KEYWORDS: Sensors, Stem cells, Microscopes, In vivo imaging, Imaging systems, Coded apertures, Image resolution, Coded aperture imaging, Gold, Silicon

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Proceedings Article | 16 March 2011 Paper

Design and development of MR-compatible SPECT systems for simultaneous SPECT-MR imaging of small animals

Benjamin M. Tsui, James Hugg, Jingyan Xu, Si Chen, Dirk Meier, William Edelstein, Abdel El-Sharkawy, Douglas Wagenaar, Bradley Patt

Proceedings Volume 7961, 79611Y (2011) https://doi.org/10.1117/12.878903

KEYWORDS: Single photon emission computed tomography, Prototyping, Magnetic resonance imaging, Collimators, Sensors, Imaging systems, Image restoration, Preclinical imaging, Data acquisition, Spatial resolution

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Proceedings Article | 16 March 2011 Paper

Material separation in x-ray CT with energy resolved photon-counting detectors

X. Wang, D. Meier, K. Taguchi, D. Wagenaar, B. Patt, E. Frey

Proceedings Volume 7961, 79611V (2011) https://doi.org/10.1117/12.877469

KEYWORDS: Signal attenuation, Sensors, Photodetectors, X-rays, Iodine, Gadolinium, X-ray detectors, Absorption, X-ray computed tomography, Polymethylmethacrylate

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Proceedings Article | 19 March 2010 Paper

Microcomputed tomography with a second generation photon-counting x-ray detector: contrast analysis and material separation

X. Wang, D. Meier, P. Oya, G. Maehlum, D. Wagenaar, B. M. Tsui, B. Patt, E. Frey

Proceedings Volume 7622, 76221B (2010) https://doi.org/10.1117/12.844301

KEYWORDS: Sensors, Signal attenuation, X-ray detectors, X-rays, Photodetectors, Gadolinium, Iodine, Bone, Photons, Polymethylmethacrylate

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Proceedings Article | 19 March 2010 Paper

SPECT data acquisition and image reconstruction in a stationary small animal SPECT/MRI system

Jingyan Xu, Si Chen, Jianhua Yu, Dirk Meier, Douglas Wagenaar, Bradley Patt, Benjamin M. Tsui

Proceedings Volume 7622, 76220V (2010) https://doi.org/10.1117/12.845504

KEYWORDS: Single photon emission computed tomography, Sensors, Collimators, Image restoration, Point spread functions, Magnetic resonance imaging, Data acquisition, Image resolution, Matrices, Tomography

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The goal of the study was to investigate data acquisition strategies and image reconstruction methods for a stationary SPECT insert that can operate inside an MRI scanner with a 12 cm bore diameter for simultaneous SPECT/MRI imaging of small animals. The SPECT insert consists of 3 octagonal rings of 8 MR-compatible CZT detectors per ring surrounding a multi-pinhole (MPH) collimator sleeve. Each pinhole is constructed to project the field-of-view (FOV) to one CZT detector. All 24 pinholes are focused to a cylindrical FOV of 25 mm in diameter and 34 mm in length. The data acquisition strategies we evaluated were optional collimator rotations to improve tomographic sampling; and the image reconstruction methods were iterative ML-EM with and without compensation for the geometric response function (GRF) of the MPH collimator. For this purpose, we developed an analytic simulator that calculates the system matrix with the GRF models of the MPH collimator. The simulator was used to generate projection data of a digital rod phantom with pinhole aperture sizes of 1 mm and 2 mm and with different collimator rotation patterns. Iterative ML-EM reconstruction with and without GRF compensation were used to reconstruct the projection data from the central ring of 8 detectors only, and from all 24 detectors. Our results indicated that without GRF compensation and at the default design of 24 projection views, the reconstructed images had significant artifacts. Accurate GRF compensation substantially improved the reconstructed image resolution and reduced image artifacts. With accurate GRF compensation, useful reconstructed images can be obtained using 24 projection views only. This last finding potentially enables dynamic SPECT (and/or MRI) studies in small animals, one of many possible application areas of the SPECT/MRI system. Further research efforts are warranted including experimentally measuring the system matrix for improved geometrical accuracy, incorporating the co-registered MRI image in SPECT reconstruction, and exploring potential applications of the simultaneous SPECT/MRI SA system including dynamic SPECT studies.

Proceedings Article | 28 September 2007 Paper

Advantages of semiconductor CZT for medical imaging

Douglas Wagenaar, Kevin Parnham, Bjorn Sundal, Gunnar Maehlum, Samir Chowdhury, Dirk Meier, Thor Vandehei, Marek Szawlowski, Bradley Patt

Proceedings Volume 6707, 67070I (2007) https://doi.org/10.1117/12.740329

KEYWORDS: Cameras, Medical imaging, Sensors, Single photon emission computed tomography, Spatial resolution, Imaging systems, Image resolution, Semiconductors, Positron emission tomography, Tomography

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Showing 5 of 11 publications

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