Short Introduction

Simon Maretzke
Institute for Numerical and Applied Mathematics
Lotzestrasse 16-18
37083 Goettingen


Room 303
Phone (+49) 551 39 12468
s.maretzke [at] math.uni-goettingen.de

As a PhD-student in project C02 of the SFB 755 "Nanoscale Photonic Imaging", I cooperate with researchers from the Institute for X-ray Physics in order to gain theoretical insights and tailor numerical algorithms for inverse problems in the field of x-ray imaging. My advisor is Prof. Dr. Thorsten Hohage.

Research Interests ´

• Phase contrast imaging with x-rays
  
• Uniqueness and stability of phase reconstructions
  
• Tomographic imaging and alignment
  
• Numerical reconstruction techniques (iteratively regularized Gauss-Newton methods)
  

Dissertation

The published version of my PhD thesis can be found here.

Publications

• van Leeuwen, Tristan, Maretzke, Simon, Batenburg, K Joost. 2018. Automatic alignment for three-dimensional tomographic reconstruction. Inverse Problems 34(2): 024004. http://iopscience.iop.org/article/10.1088/1361-6420/aaa0f8 (also available on arXiv).
• Zickert, Gustav, Maretzke, Simon. 2018. Cryogenic electron tomography reconstructions from phaseless data. Inverse Problems 34: 124001. http://iopscience.iop.org/article/10.1088/1361-6420/aade22
• Maretzke, Simon. 2018. Locality estimates for Fresnel-wave-propagation and stability of near-field X-ray propagation imaging with finite detectors. Inverse problems 34(12): 124004. http://iopscience.iop.org/article/10.1088/1361-6420/aae78f (also available on arXiv).
• Maretzke, Simon. 2018. Generalized SART-Methods for Tomographic Imaging. arXiv preprint. arXiv:1803.04726. https://arxiv.org/abs/1803.04726 (submitted to SIAM Journal on Imaging Sciences).
• Maretzke, Simon, Hohage, Thorsten. 2017. Stability estimates for linearized near-field phase retrieval in X-ray phase contrast imaging. SIAM Journal on Applied Mathematics 77: 384–-408. http://epubs.siam.org/doi/abs/10.1137/16M1086170 (also available on arXiv).
• Maretzke, Simon, Bartels, Matthias, Krenkel, Martin, Salditt, Tim, Hohage, Thorsten. 2016. Regularized Newton methods for X-ray phase contrast and general imaging problems. Optics Express 24: 6490-6506. https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-6-6490
• Maretzke, Simon. 2015. Regularized Newton methods for simultaneous Radon inversion and phase retrieval in phase contrast tomography. arXiv preprint. arXiv:1502.05073. http://arxiv.org/abs/1502.05073
• Maretzke, Simon. 2015. A uniqueness result for propagation-based phase contrast imaging from a single measurement. Inverse Problems 31: IOP Publishing. 065003. http://dx.doi.org/10.1088/0266-5611/31/6/065003 (featured in Insights, also available on arXiv).
• Maretzke, Simon, Hof, Björn, Avila, Marc. 2014. Transient growth in linearly stable Taylor-Couette flows. Journal of Fluid Mechanics 742: Cambridge Univ Press. 254-290. http://dx.doi.org/10.1017/jfm.2014.12 (featured in Focus on Fluids, also available on arXiv).



All publications as BibTeX-file: bibtex

Conferences and Workshops

• IMA Conference on Inverse Problems from Theory to Application, Talk (pdf), Cambridge (UK), September 19-21, 2017


• MFO-Workshop "Computational Inverse Problems for Partial Differential Equations", Talk (pdf), Oberwolfach (Germany), May 14-20, 2017


• 100 Years of the Radon Transform, Talk (pdf), RICAM Linz (Austria), March 27-31, 2017


• International Workshop on Phase Retrieval and Coherent Scattering, Poster (pdf), Saint Malo (France), June 7-10, 2016


• Conference "Inverse Problems: Modelling and Simulation", Fethiye (Turkey), May 23-28, 2016


• International Symposium "Biological Dynamics from Microscopic to Mesoscopic Scales", Poster (pdf) and Talk (pdf), Kloster Nimbschen (Germany), February 22-25, 2016


• Winter School on Advances in Mathematics of Signal Processing, Bonn (Germany), January 11-16, 2016


• Summer School on "Inverse Problems for Waves", Poster (pdf), Ecole Polytechnique Paris (France), August 24-28, 2015


• Applied Inverse Problems Conference, Poster (pdf), Helsinki (Finland), May 25-29, 2015


• Workshop on "Inverse Problems in Wave Propagation", Bremen (Germany), April 7-10, 2015


• IFIP WG 7.4 Workshop "Inverse Problems and Imaging", Talk (pdf), Mülheim a.d. Ruhr (Germany), December 15-17, 2014


• 18th International Couette–Taylor Workshop, Poster (pdf), Enschede (Netherlands), June 24-26, 2013


• Fluid Dynamics Summer School, Edmonton (Canada), July 23-27, 2012

Teaching

• Summer term 2017: Functional Analysis, tutor


• Summer term 2016: Numerical Mathematics II, tutor


• Summer term 2015: Functional Analysis, tutor


• Summer term 2013: Scientific Computing II, tutor


• Winter term 2012/2013: Analytical Mechanics, tutor


• Winter term 2011/2012: Mathematical Methods of Physics II, tutor


• Summer term 2011: Scientific Computing II, tutor