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Working Group Imaging
Institute for Computational and Applied Mathematics
University of Münster
Einsteinstr. 62
D-48149 Münster

Office room :	120.004 (Orléans-Ring 10)
Tel. :	+49 251 83-35126
Fax :	+49 251 83-32729
e-mail:	alex dot sawatzky at wwu dot de

Personal Information

July 2011 - present: Postdoctoral researcher in Working Group Imaging, Institute for Computational and Applied Mathematics, WWU Münster

June 2007 - July 2011: PhD student in Working Group Imaging, Institute for Computational and Applied Mathematics, WWU Münster
- Dec 2008 - June 2010: Supported by the German Federal Ministry of Education and Research (BMBF) through the project INVERS: Deconvolution problems with sparsity constraints
- July 2011: PhD thesis in applied mathematics with topic "(Nonlocal) Total Variation in Medical Imaging"
  Supervisor: Prof. Dr. Martin Burger

Oct 2002 - May 2007: Academic studies (mathematics with minor computer science) at Westfälische Wilhelms-Universität (WWU) Münster
- May 2007: Diploma thesis in applied mathematics with topic "Reflektoren in der Ultraschall-Tomographie (Reflectors in Ultrasound Tomography)"
  Supervisor: Prof. Dr. Dr. h. c. Frank Natterer

Publications

2011


		A Variational Framework for Region-Based Segmentation Incorporating Physical Noise Models
		Alex Sawatzky, Daniel Tenbrinck, Xiaoyi Jiang and Martin Burger
		UCLA CAM Report 11-81, Dec 2011 (Revised: Apr 2012), and submitted


		Forward-Backward EM-TV methods for inverse problems with Poisson noise
		Christoph Brune, Alex Sawatzky, Thomas Kösters, Frank Wübbeling and Martin Burger
		Preprint, Nov 2011


		Reconstruction of short time PET scans using Bregman iterations
		Jahn Müller, Christoph Brune, Alex Sawatzky, Thomas Kösters, Frank Wübbeling, Klaus Schäfers and Martin Burger
		Conference Record of the 2011 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC), page 2383-2385. Publisher: IEEE, Oct 2011 DOI: 10.1109/NSSMIC.2011.6153884


		(Nonlocal) Total Variation in Medical Imaging
		Alex Sawatzky
		Ph.D. Thesis, Institute for Computational and Applied Mathematics, University of Münster, July 2011

2010


		Edge-Preserving Regularization for the Deconvolution of Biological Images in Nanoscopy
		Alex Sawatzky and Martin Burger
		In T. E. Simos et al, editor, Proceedings of the 8th International Conference of Numerical Analysis and Applied Mathematics (ICNAAM) 2010, Volume 1281 of AIP Conference Proceedings, page 1983-1986. Publisher: American Institute of Physics, Sept 2010 DOI: 10.1063/1.3498325


		Primal and Dual Bregman Methods with Application to Optical Nanoscopy
		Christoph Brune, Alex Sawatzky and Martin Burger
		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
		Alex Sawatzky, Christoph Brune, Jahn Müller and Martin Burger
		In X. Jiang and N. Petkov, editor, Proceedings of the 13th International Conference on Computer Analysis of Images and Patterns (CAIP) 2009, Volume 5702 of Lecture Notes in Computer Science, page 533-540. Publisher: Springer, Sept 2009 DOI: 10.1007/978-3-642-03767-2_65


		Bregman-EM-TV Methods with Application to Optical Nanoscopy
		Christoph Brune, Alex Sawatzky and Martin Burger
		In X.-C. Tai et al, editor, Proceedings of the 2nd International Conference on Scale Space and Variational Methods in Computer Vision (SSVM) 2009, Volume 5567 of Lecture Notes in Computer Science, page 235-246. Publisher: Springer, June 2009 DOI: 10.1007/978-3-642-02256-2_20

2008


		Accurate EM-TV algorithm in PET with low SNR
		Alex Sawatzky, Christoph Brune, Frank Wübbeling, Thomas Kösters, Klaus Schäfers and Martin Burger
		Conference Record of the 2008 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC), page 5133-5137. Publisher: IEEE, Oct 2008 DOI: 10.1109/NSSMIC.2008.4774392

2007


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

Talks & Posters at Conferences and Workshops

2012

A Variational Framework for Region-Based Segmentation Incorporating Physical Noise Models
TOPIM 2012 - 6th Winter Conference on Processing of Biomedical Images, Les Houches, France, Apr 15-20, 2012.

2010

Edge-Preserving Regularization for Deconvolution of Biological Images in Nanoscopy
ICNAAM 2010 - 8th International Conference on Numerical Analysis and Applied Mathematics, Rhodes, Greece, Sept 19-25, 2010.
Total Variation Processing of Images with Poisson Statistics
SIAM IS 2010 - SIAM Conference on Imaging Science, Chicago, Illinois, USA, Apr 12-14, 2010.

2009

Nonlocal Total Variation Regularization
INVERS 2009 - 3rd Annual Meeting of Joint Research Project INVERS of German Federal Ministry of Education and Research (BMBF), Münster, Germany, Oct 20-21, 2009.
FB-EM-TV Reconstruction for Inverse Problems with Poisson Noise
ÖMG/DMV Congress 2009 - 17th ÖMG Congress and Annual DMV Meeting, Graz, Austria, Sept 20-25, 2009.
Total Variation Processing of Images with Poisson Statistics
CAIP 2009 - 13th International Conference on Computer Analysis of Images and Patterns, Münster, Germany, Sept 2-4, 2009.

2008

Accurate EM-TV Algorithm in PET with Low SNR
IEEE NSS/MIC/RTSD 2008 - Nuclear Science Symposium and Medical Imaging Conference, Dresden, Germany, Oct 19-25, 2008.
EM-TV Methods in Inverse Problems with Poisson Noise
CIME Summer School 2008 - Level Set and PDE based Reconstruction Methods: Applications to Inverse Problems and Image Processing (Organizers: Osher, Burger, Mennucci, Rumpf, Dorn), Cetraro (Cosenza), Italy, Sept 8-13, 2008.