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Alex Sawatzky

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E-mail:   alex dot sawatzky at wwu dot de

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Research Interests
  • Inverse problems in biomedical imaging
  • Image processing and image reconstruction
  • Variational methods
  • Regularization methods with singular energies
  • Positron emission tomography (PET)
  • Medical ultrasound imaging
  • Energy-resolved X-ray CT (Spectral CT)

Publications
2016
Accelerated fast iterative shrinkage thresholding algorithms for sparsity-regularized cone-beam CT image reconstruction
Qiaofeng Xu, Deshan Yang, Jun Tan, Alex Sawatzky, and Mark Anastasio
Medical Physics, 43(4):1849. Publisher: American Association of Physicists in Medicine, March 2016
DOI: 10.1118/1.4942812


2014
Performance of Primal-Dual Algorithms for Multi-Channel Image Reconstruction in Spectral X-ray CT
Johann Niesen and Alex Sawatzky
Conference Record of the 2014 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC). Publisher: IEEE, Nov 2014
DOI: 10.1109/NSSMIC.2014.7430805
First Order Algorithms in Variational Image Processing
Preprint, arXiv:1412.4237, Dec 2014
Published: In: R. Glowinski, S. J. Osher, and W. Yin (eds.), Splitting Methods in Communication, Imaging, Science, and Engineering, Part of the series Scientific Computation, pp. 345-407. Publisher: Springer, Jan 2017
DOI: 10.1007/978-3-319-41589-5_10
Proximal ADMM for Multi-Channel Image Reconstruction in Spectral X-ray CT
Alex Sawatzky, Qiaofeng Xu, Carsten Schirra, and Mark Anastasio
IEEE Transactions on Medical Imaging, 33(8):1657-1668. Publisher: IEEE, Aug 2014
DOI: 10.1109/TMI.2014.2321098
Performance of First-Order Algorithms for TV Penalized Weighted Least-Squares Denoising Problem
In: A. Elmoataz et al. (eds.), Proceedings of the 6th International Conference on Image and Signal Processing (ICISP) 2014, Lecture Notes in Computer Science, Vol. 8509, pp. 340-349. Publisher: Springer, Jun 2014
DOI: 10.1007/978-3-319-07998-1_39
Sparsity-Regularized Image Reconstruction of Decomposed K-edge Data in Spectral CT
Qiaofeng Xu, Alex Sawatzky, Mark Anastasio, and Carsten Schirra
Physics in Medicine and Biology, 59(10):N65. Publisher: IOP Publishing, Apr 2014
DOI: 10.1088/0031-9155/59/10/N65
A Multi-Channel Image Reconstruction Method for Grating-Based X-ray Phase-Contrast Computed Tomography
In: B. R. Whiting et al. (eds.), Proceedings of SPIE Medical Imaging 2014: Physics of Medical Imaging, Vol. 9033. Publisher: SPIE, March 2014
DOI: 10.1117/12.2043732


2013
EM-TV Methods for Inverse Problems with Poisson Noise
In: M. Burger and S. Osher (eds.), Level Set and PDE Based Reconstruction Methods in Imaging, Lecture Notes in Mathematics, Vol. 2090, pp. 71-142. Publisher: Springer, Nov 2013
DOI: 10.1007/978-3-319-01712-9_2


2012
Impact of Physical Noise Modeling on Image Segmentation in Echocardiography
Daniel Tenbrinck, Alex Sawatzky, Xiaoyi Jiang, Martin Burger, Wladimir Haffner, Patrick Willems, Matthias Paul and Jörg Stypmann
In: T. Ropinski et al. (eds.), Proceedings of the 3rd Eurographics Workshop on Visual Computing for Biology and Medicine (VCBM) 2012, pp. 33-40. Publisher: Eurographics
DOI: 10.2312/VCBM/VCBM12/033-040


2011
A Variational Framework for Region-Based Segmentation Incorporating Physical Noise Models
UCLA CAM Report 11-81, Dec 2011 (Revised: Dec 2012)
Published: Journal of Mathematical Imaging and Vision, 47(3):179-209 2013. Publisher: Springer, Nov 2013
DOI: 10.1007/s10851-013-0419-6
Reconstruction of short time PET scans using Bregman iterations
Conference Record of the 2011 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC), pp. 2383-2385. Publisher: IEEE, Oct 2011
DOI: 10.1109/NSSMIC.2011.6153884
(Nonlocal) Total Variation in Medical Imaging
Ph.D. Thesis, Institute for Computational and Applied Mathematics, University of Münster, Jul 2011


2010
Edge-Preserving Regularization for the Deconvolution of Biological Images in Nanoscopy
In: T. E. Simos et al. (eds.), Proceedings of the 8th International Conference of Numerical Analysis and Applied Mathematics (ICNAAM) 2010, AIP Conference Proceedings, Vol. 1281, pp. 1983-1986. Publisher: American Institute of Physics, Sept 2010
DOI: 10.1063/1.3498325
Primal and Dual Bregman Methods with Application to Optical Nanoscopy
International Journal of Computer Vision, 92(2):211-229 2010. Publisher: Springer, Apr 2010
DOI: 10.1007/s11263-010-0339-5


2009
Total Variation Processing of Images with Poisson Statistics
In: X. Jiang and N. Petkov (eds.), Proceedings of the 13th International Conference on Computer Analysis of Images and Patterns (CAIP) 2009, Lecture Notes in Computer Science, Vol. 5702, pp. 533-540. Publisher: Springer, Sept 2009
DOI: 10.1007/978-3-642-03767-2_65
Bregman-EM-TV Methods with Application to Optical Nanoscopy
In: X.-C. Tai et al. (eds.), Proceedings of the 2nd International Conference on Scale Space and Variational Methods in Computer Vision (SSVM) 2009, Lecture Notes in Computer Science, Vol. 5567, pp. 235-246. Publisher: Springer, Jun 2009
DOI: 10.1007/978-3-642-02256-2_20


2008
Accurate EM-TV algorithm in PET with low SNR
Conference Record of the 2008 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC), pp. 5133-5137. Publisher: IEEE, Oct 2008
DOI: 10.1109/NSSMIC.2008.4774392


2007
Reflektoren in der Ultraschall-Tomographie
Diploma Thesis, Institute for Computational and Applied Mathematics, University of Münster, May 2007

Personal Information
  • Oct 2013 - Sept 2014: Postdoctoral researcher in Working Group Imaging, Institute for Computational and Applied Mathematics, Westfälische Wilhelms-Universität Münster

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  • Jul 2011 - Jun 2012: Postdoctoral researcher in Working Group Imaging, Institute for Computational and Applied Mathematics, Westfälische Wilhelms-Universität Münster

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  • Aug 1982:  Born in Orechow-Log, Russia
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