Thomas Koehler studied physics at the Christian-Albrechts-University in Kiel from 1989 to 1994. Immediately after the diploma he started to work at the Philips Research Laboratories in Hamburg on the inverse problem of electro- and magnetocardiography, resulting in a Ph.D. thesis, which was finished in 1998. Since 1998, Thomas Koehler has been working on several projects in the area of inverse problems for different applications, namely computed tomography (CT), diffuse optical tomography (DOT), transmission electron microscopy (TEM), and differential phase contrast imaging (DPCI). His primary focus has been the development of reconstruction algorithms for CT and adjacent topics. Major contributions in the field of CT are in the area of approximate and exact reconstructions algorithms for helical cone-beam CT, where he covered the mathematics of reconstruction, the practical aspects arising in clinical applications, and the implementation on dedicated hardware. Furthermore, he contributed to the field of iterative reconstruction, and he is currently working together with the Department of Radiology at TUM on the forthcoming generation of iterative reconstruction algorithms for CT. During the last few years, he has gained interest in the emerging field of DPCI, where he has worked on both projection imaging as well as on tomographic imaging.
Research Interests
Tomographic imaging
Inverse problems
Computed tomography
X-ray imaging
Phase contrast x-ray imaging
Medical imaging
Selected Publications
Schirra, C. O.; Roessl, E.; Koehler, T.; Brendel, B.; Thran, A.; Pan, D.; Anastasio, M. A.; Proksa, R.: Statistical Reconstruction of Material Decomposed Data in Spectral CT. IEEE Transactions on Medical Imaging 32 (7), 2013, 1249-1257.
Urban, Theresa; Gassert, Florian T.; Frank, Manuela; Willer, Konstantin; Noichl, Wolfgang; Buchberger, Philipp; Schick, Rafael C.; Koehler, Thomas; Bodden, Jannis H.; Fingerle, Alexander A.; Sauter, Andreas P.; Makowski, Marcus R.; Pfeiffer, Franz; Pfeiffer, Daniela: Qualitative and Quantitative Assessment of Emphysema Using Dark-Field Chest Radiography. Radiology 303 (1), 2022, 119-127 mehr…BibTeX
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Viermetz, Manuel; Gustschin, Nikolai; Schmid, Clemens; Haeusele, Jakob; Teuffenbach, Maximilian von; Meyer, Pascal; Bergner, Frank; Lasser, Tobias; Proksa, Roland; Koehler, Thomas; Pfeiffer, Franz: Dark-field computed tomography reaches the human scale. Proceedings of the National Academy of Sciences 119 (8), 2022, e2118799119 mehr…BibTeX
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2021
Willer, Konstantin; Fingerle, Alexander A; Noichl, Wolfgang; De Marco, Fabio; Frank, Manuela; Urban, Theresa; Schick, Rafael; Gustschin, Alex; Gleich, Bernhard; Herzen, Julia; Koehler, Thomas; Yaroshenko, Andre; Pralow, Thomas; Zimmermann, Gregor S; Renger, Bernhard; Sauter, Andreas P; Pfeiffer, Daniela; Makowski, Marcus R; Rummeny, Ernst J; Grenier, Philippe A; Pfeiffer, Franz: X-ray dark-field chest imaging for detection and quantification of emphysema in patients with chronic obstructive pulmonary disease: a diagnostic accuracy study. The Lancet Digital Health 3 (11), 2021, e733-e744 mehr…BibTeX
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2017
Teuffenbach, Maximilian von; Koehler, Thomas; Fehringer, Andreas; Viermetz, Manuel; Brendel, Bernhard; Herzen, Julia; Proksa, Roland; Rummeny, Ernst J.; Pfeiffer, Franz; Noël, Peter B.: Grating-based phase-contrast and dark-field computed tomography: a single-shot method. Scientific Reports 7 (1), 2017 mehr…BibTeX
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2016
Allner, S; Koehler, T; Fehringer, A; Birnbacher, L; Willner, M; Pfeiffer, F; Noël, P B: Bilateral filtering using the full noise covariance matrix applied to x-ray phase-contrast computed tomography. Physics in Medicine and Biology 61 (10), 2016, 3867-3856 mehr…BibTeX
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2015
Brendel, Bernhard; von Teuffenbach, Maximilian; Noël, Peter B.; Pfeiffer, Franz; Koehler, Thomas: Penalized maximum likelihood reconstruction for x-ray differential phase-contrast tomography. Medical Physics 43 (1), 2015, 188-194 mehr…BibTeX
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Epple, Franz M.; Ehn, Sebastian; Thibault, Pierre; Koehler, Thomas; Potdevin, Guillaume; Herzen, Julia; Pennicard, David; Graafsma, Heinz; Noel, Peter B.; Pfeiffer, Franz: Phase Unwrapping in Spectral X-Ray Differential Phase-Contrast Imaging With an Energy-Resolving Photon-Counting Pixel Detector. IEEE Transactions on Medical Imaging 34 (3), 2015, 816-823 mehr…BibTeX
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