Matthias Wieczorek

Contact Dr. Matthias Wieczorek room: MI 03.13.061 phone: +49 89 289 19427 e-mail: Alumni: Now with ImFusion GmbH Research Scientist/Software Engineer Research Interests Tomographic reconstruction GPU-accelerated algorithms Advanced medical visualization

Dissertation

Anisotropic X-ray Dark-field Tomography Abstract: Modern X-ray based imaging enables recording of phase-contrast (refraction) and dark-field (scattering) information. Tomographic reconstruction of the dark-field signal poses a particularly challenging problem, as the scattering within an object depends on its orientation. Within this thesis an abstract software framework for tomographic reconstruction as well as a novel method for Anisotropic X-ray Dark-field Tomography will be presented. A first biomedical experiment on a sample of a human cerebellum indicates that this method could provide a complementary imaging modality for imaging nerve fibers. Download: https://mediatum.ub.tum.de/?id=1362008

Publications

2018
	M. Wieczorek, F. Schaff, C. Jud, D. Pfeiffer, F. Pfeiffer, T. Lasser Brain Connectivity Exposed by Anisotropic X-ray Dark-field Tomography Sci. Rep. 8:14345, 2018 (bib)
	S. Seyyedi, M. Wieczorek, F. Pfeiffer, T. Lasser Incorporating a Noise Reduction Technique into X-ray Tensor Tomography IEEE Transactions on Computational Imaging 4(1):137-146, 2018 (bib)
2017
	M. Wieczorek, F. Pfeiffer, T. Lasser Micro-structure orientation extraction for Anisotropic X-Ray Dark-Field Tomography International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Xi'an Shaanxi, China, June 2017 (bib)
	Y. Sharma, F. Schaff, M. Wieczorek, F. Pfeiffer, T. Lasser Acquisition Schemes for Directional Dark-Field Tomographic Modalities International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Xi'an Shaanxi, China, June 2017 (bib)
	N. Schilling, M. Wieczorek, T. Lasser Statistical Models for Anisotropic X-Ray Dark-field Tomography International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Xi'an Shaanxi, China, June 2017 (bib)
	Y. Sharma, F. Schaff, M. Wieczorek, F. Pfeiffer, T. Lasser Design of Acquisition Schemes and Setup Geometry for Anisotropic X-ray Dark-Field Tomography (AXDT) Scientific Reports 7:3195, 2017. (bib)
2016
	M. Wieczorek, F. Schaff, F. Pfeiffer, T. Lasser Anisotropic X-Ray Dark-Field Tomography: A Continuous Model and its Discretization Phys. Rev. Lett. 117, 158101, 2016 (bib)
	Y. Sharma, M. Wieczorek, F. Schaff, S. Seyyedi, F. Prade, F. Pfeiffer, T. Lasser Six dimensional X-ray Tensor Tomography with a compact laboratory setup Appl. Phys. Lett. 109, 134102 (2016); http://dx.doi.org/10.1063/1.4963649 (bib)
	S. Seyyedi, M. Wieczorek, C. Jud, F. Pfeiffer, T. Lasser A Regularized X-ray Tensor Tomography Reconstruction Technique International Conference on Image Formation in X-Ray Computed Tomography, Bamberg, Germany, July 2016 (bib)
	M. Wieczorek, C. Jud, F. Schaff, F. Pfeiffer, T. Lasser X-ray tensor tomography -- linear system approach to reconstruction International Conference on Image Formation in X-Ray Computed Tomography, Bamberg, Germany, July 2016 (bib)
	Y. Sharma, M. Wieczorek, C. Jud, F. Schaff, F. Pfeiffer, T. Lasser X-ray Tensor Tomography: How much to measure? International Conference on Image Formation in X-Ray Computed Tomography, Bamberg, Germany, July 2016 (bib)
	S. Seyyedi, M. Wieczorek, Y. Sharma, F. Schaff, C. Jud, F. Pfeiffer, T. Lasser Component-based TV Regularization for X-ray Tensor Tomography International Symposium on Biomedical Imaging (ISBI), Prague, Czech Republic, April 2016 (bib)
	M. Baust, A. Weinmann, M. Wieczorek, T. Lasser, M. Storath, N. Navab Combined Tensor Fitting and TV Regularization in Diffusion Tensor Imaging based on a Riemannian Manifold Approach IEEE Transactions on Medical Imaging (TMI), IEEE, 2016. (bib)
	M. Wieczorek, F. Schaff, C. Jud, F. Pfeiffer, T. Lasser An optimization oriented approach to X-ray tensor tomogprahy International Symposium on BioMedical Applications of X-Ray Phase Contrast Imaging (IMXP), Garmisch-Patenkirchen, Germany, January 2016 (bib)
	Y. Sharma, M. Wieczorek, F. Schaff, C. Jud, F. Pfeiffer, T. Lasser Acquisition Geometry for X-ray Tensor Tomography International Symposium on BioMedical Applications of X-Ray Phase Contrast Imaging (IMXP), Garmisch-Patenkirchen, Germany, January 2016 (bib)
2015
	J. Vogel, F. Schaff, A. Fehringer, C. Jud, M. Wieczorek, F. Pfeiffer, T. Lasser Constrained X-ray tensor tomography reconstruction Optics Express 23(12):15134-15151, 2015 (bib)
	M. Wieczorek, J. Vogel, A. Weinmann, C. Jud, F. Schaff, M. Storath, F. Pfeiffer, M. Baust, T. Lasser Total Variation Regularization for X-Ray Tensor Tomography Proceedings of Fully3D, Newport, USA, June 2015 (bib)
	J. Vogel, M. Wieczorek, C. Jud, F. Schaff, F. Pfeiffer, T. Lasser X-ray Tensor Tomography Reconstruction Proceedings of Fully3D, Newport, USA, June 2015 (bib)
	J. Gardiazabal, J. Vogel, P. Matthies, M. Wieczorek, B. Frisch, N. Navab, S. I. Ziegler, T. Lasser Fully 3D thyroid imaging with mini gamma cameras Proceedings of Fully3D, Newport, USA, June 2015 (bib)
	M. Wieczorek, J. Frikel, J. Vogel, E. Eggl, F. Kopp, P. B. Noël, F. Pfeiffer, L. Demaret, T. Lasser X-ray Computed Tomography using Curvelet Sparse Regularization Medical Physics 42(4):1555, 2015 (bib)
	T. Lasser, J. Gardiazabal, M. Wieczorek, P. Matthies, J. Vogel, B. Frisch, N. Navab Towards 3D thyroid imaging using robotic mini gamma cameras Bildverarbeitung für die Medizin, Lübeck, Germany, March 2015 (bib)
2014
	M. Wieczorek, J. Vogel, T. Lasser CampRecon - a software framework for linear inverse problems Technical report, Technische Universität München, 2014. Available via mediatum. (bib)
2013
	M. Wieczorek, J. Frikel, J. Vogel, F. Pfeiffer, L. Demaret, T. Lasser Curvelet sparse regularization for differential phase-contrast X-ray imaging Proceedings of Fully3D, Lake Tahoe, USA, June 2013. (bib)
2012
	A. Aichert, M. Wieczorek, Jian Wang, L. Wang, Matthias Kreiser, P. Fallavollita, N. Navab The Colored X-rays MICCAI 2012 Workshop on Augmented Environments for Computer-Assisted Interventions (bib)
2011
	M. Wieczorek, A. Aichert, P. Fallavollita, O. Kutter, A. Ahmadi, L. Wang, N. Navab Interactive 3D visualization of a single-view X-Ray image Proceedings of Medical Image Computing and Computer-Assisted Intervention (MICCAI 2011), Toronto, Canada, September 2011. (bib)
2010
	T. Blum, M. Wieczorek, A. Aichert, R. Tibrewal, N. Navab The effect of out-of-focus blur on visual discomfort when using stereo displays The 9th IEEE and ACM International Symposium on Mixed and Augmented Reality, Seoul, Korea, Oct. 13 - 16, 2010. The original publication is available online at ieee.org. (bib)
	M. Wieczorek, A. Aichert, O. Kutter, C. Bichlmeier, J. Landes, S.M. Heining, E. Euler, N. Navab GPU-accelerated Rendering for Medical Augmented Reality in Minimally-Invasive Procedures Proceedings of Bildverarbeitung fuer die Medizin (BVM 2010), Aachen, Germany, March 14-16 2010 (bib)

Student Projects

• finished: Implementation of efficient computational modules for forward- and backward-projection in X-ray computed tomography, by David Frank (Project)
• finished: Regularization of Structures in Anisotropic X-ray Dark-field Tomography, by Maximilian Hornung (Bachelor Thesis)
• finished: Interface and Workflow Integration of a C++ Statistical Reconstruction Toolbox for X-ray Computed Tomography in Radiology, by Christian Grimm; Dominik Vinan (IDP)
• finished: Statistical Reconstruction Methods for Anisotropic X-ray Dark-field Tomography, by Nathanael Schilling (Bachelor Thesis)
• finished: Efficient GPU Projectors for X-ray Computed Tomography, by Michal Szymczak (Master Thesis)
• finished: Implementation and evaluation of splitting methods for reconstruction of X-ray Computed Tomography, by Johann Frei (Bachelor Thesis)
• finished: Regularization of spherical harmonics for Anisotropic X-ray Dark-field Tomography, by Maximilian Endrass (Bachelor Thesis)
• finished: Tomographic reconstruction and visualization of x-ray scattering tensor data, by Hessam Roodaki (Master Thesis)
• finished: Detection Models for Emission Tomography, by (DA/MA/BA)
• finished: Computation of Detectability Indices for Medical Imaging, by (DA/MA/BA)

Teaching

Winter Term 2016

• Praktikum Image Reconstruction and Visualization using C++

Summer Term 2016

• Praktikum Image Reconstruction and Visualization using C++

Winter Term 2015

• Praktikum Image Processing and Visualization using C++

Summer Term 2015

• Lecture Algorithmen und Datenstrukturen (für ET/IT)

Winter Term 2014/2015

• Hauptseminar Regularization and Sparsity in X-Ray Computed Tomography

Summer Term 2014

• Lecture Algorithmen und Datenstrukturen (für ET/IT)

Summer Term 2013

• Lecture Basic Mathematical Tools for Imaging and Visualization

Award

• VDI Award 2013 for the master's thesis Curvelet sparse regularization for differential phase-contrast X-ray imaging

Bachelor's Thesis (Mathematics)

Inversion of the Radon transform using adaptive triangulation

Master's Thesis (Computer Science)

Curvelet sparse regularization for differential phase-contrast X-ray imaging

Bachelor's Thesis (Computer Science)

Evaluation of Advanced real-time Visualization Techniques for Medical Augmented Reality

Former Activities

• Chair for Applied Software Engineering
• macinTUM