Experience

• synG4 GmbH, since 2023, Scientific Consultant, Reconstruction for clinical CT
• ECAP, 2023, FAU Erlangen-Nürnberg, Scientific Consultant, X-ray Talbot-Lau Darkfield Computed Tomography
• Autohaus Ritter GmbH & Co. KG, since 2022, IT Consultant
  • Tire storage contract web formular
  • Gas station competition monitoring
• Siemens Healthineers AG, 2015-2022, Research Scientist, permanent, Physics and algorithm pre-development for CT / CT in radiation therapy
  • Correction algorithm for stack transition motion artifacts in cardiac CT [DE102022200999A1]
  • Tube-voltage independent reconstruction for Single Energy CT [white paper]
  • CT Reconstructions for Ai organ segmentation in RT [DE102018216370B4]
  • CT Lung Ventilation, 4DCT post-processing
• ECAP, FAU Erlangen-Nürnberg, 2010-2015, Research Assistant, X-ray Talbot-Lau Interferometry
  • Development of a Simulation Framework for Coherent X-ray optics
  • Research, Optimization and Algorithm Development for X-ray Talbot-Lau Interferometrie
  • Teaching Assistant & Supervision

Software Engineering

• 20+ years of experience in software development
• Proficient in various programming languages
  
• Configuration Management: git, Docker, GitHub actions, Azure DevOps, Autotools, Cargo
• Data Science: NumPy, SciPy, PyTorch, Matplotlib
• Parallel computing: GPGPU/CUDA, async, MPI
• Platforms: macOS, Linux, Windows

Academia

Inventions

Granted Patents

• "Method for providing result data which is suitable for use in planning the irradiation of a patient", Christopher Jude Amies, Christian Hofmann, Philipp Hölzer, René Kartmann, Mark-Aleksi Keller-Reichenbecher, Björn Kreisler, André Ritter, 2023
• "Method and system for calculating an output of a scrollable stack of images provided by a tomographer", Matthias Baer-Beck, Sebastian Faby, Rainer Raupach, André Ritter, 2022
• "Method for providing conversion information about an imaging data set, x-ray device, computer program and electronically readable data carrier", André Ritter, Christian Hofmann, 2022
• "Provision of a medical image", Matthias Guckenberger, Christian Hofmann, André Ritter, Stephanie Tanadini-Lang, 2021
• "Bereitstellen eines annotierten medizinischen Bilddatensatzes für eine Radiotherapieplanung eines Patienten", André Ritter, 2020
• "Provision of a medical image", Christian Hofmann, André Ritter, 2020
• "Verfahren zur automatisierten Erzeugung eines Volumenmodells von Korrekturdaten für ein röntgenbasiertes bildgebendes medizinisches Gerät", André Ritter, Christian Hofmann, Pavlo Dyban, Jens-Christoph Georgi, Kai Schubert, Dieter Oetzel, Eric Tonndorf-Martini, 2020
• "Verfahren zum Betrieb einer bildgebenden Röntgeneinrichtung, insbesondere Computertomograph, Röntgeneinrichtung und Computerprogrammprodukt", André Ritter, 2019
• "Method for processing medical image data and image processing system for medical image data", André Ritter, 2019
• "Verfahren zum Bereitstellen von mittels eines Dual-Source CT-Geräts aus einem Messfeld erfassten quantitativen CT-Bilddaten, sowie Recheneinheit, Dual-Source CT-Gerät und Computerprogrammprodukt", Christian Hofmann, Nora Hünemohr, Rainer Raupach, André Ritter, 2017

Patent Applications

• "Verfahren und Vorrichtung zur Rekonstruktion von CT-Bildern", André Ritter, Thomas Allmendinger, 2023
• "Medical image data set for radiotherapy planning", André Ritter, 2020

Publications

• "Assessment of the additional clinical potential of X-ray dark-field imaging for breast cancer in a preclinical setup", Julius Emons, Peter A Fasching, Marius Wunderle, Felix Heindl, Jens Rieger, Florian Horn, Georg Pelzer, André Ritter, Thomas Weber, Marcus Radicke, et al., Therapeutic advances in medical oncology, Vol. 12, 2020
• "Assessment of clinical potential of X-ray dark-field imaging for breast cancer", J Emons, M Wunderle, PA Emons, F Heindl, J Rieger, F Horn, G Pelzer, André Ritter, T Weber, M Radicke, et al., Geburtshilfe und Frauenheilkunde, Vol. 78 (10), 2018
• "Clinical evaluation of a novel CT image reconstruction algorithm for direct dose calculations", Brent van der Heyden, Michel Öllers, André Ritter, Frank Verhaegen, Wouter van Elmpt, Physics and Imaging in Radiation Oncology, Vol. 2, 2017
• "A beam hardening and dispersion correction for x-ray dark-field radiography", Georg Pelzer, Gisela Anton, Florian Horn, Jens Rieger, André Ritter, Johannes Wandner, Thomas Weber, Thilo Michel, Medical Physics, Vol. 43 (6Part1), 2016
• "Dosimetric evaluation of direct electron density computed tomography images for simplification of treatment planning workflow", T Zhao, NN Mistry, André Ritter, B Sun, H Li, S Mutic, International Journal of Radiation Oncology, Biology, Physics, Vol. 96 (2), 2016
• "Simultaneous maximum-likelihood reconstruction of absorption coefficient, refractive index and dark-field scattering coefficient in x-ray talbot-lau tomography", André Ritter, Gisela Anton, Thomas Weber, Plos one, Vol. 11 (10), 2016
• "DirectDensity: Technical principles and implications for radiotherapy", André Ritter, N Mistry, Siemens Healthineers Whitepaper, 2016
• "TH-CD-202-02: A Preliminary Study Evaluating Beam-Hardening Artifact Reduction On CT Direct Electron-Density Images", H Li, S Dolly, T Zhao, André Ritter, N Mistry, V Colombo, R Raupach, N Huenemohr, L Yu, M Anastasio, et al., Medical Physics, Vol. 43 (6Part45), 2016
• "Report of improved performance in Talbot--Lau phase-contrast computed tomography", Thomas Weber, Georg Pelzer, Jens Rieger, André Ritter, Gisela Anton, Medical physics, Vol. 42 (6Part1), 2015
• "Medical Physics Letter", Thomas Weber, Georg Pelzer, Jens Rieger, André Ritter, Gisela Anton, Medical Physics, Vol. 42, 2015
• "Energy weighted x-ray dark-field imaging", Georg Pelzer, Andrea Zang, Gisela Anton, Florian Bayer, Florian Horn, Manuel Kraus, Jens Rieger, André Ritter, Johannes Wandner, Thomas Weber, et al., Optics express, Vol. 22 (20), 2014
• "Modified shifted angular spectrum method for numerical propagation at reduced spatial sampling rates", André Ritter, Optics express, Vol. 22 (21), 2014
• "Simulation of dark-field imaging of micro-calcifications in human breast tissue with X-ray Talbot-Lau interferometry", André Ritter, G Anton, F Baer, K Gödel, G Pelzer, J Rieger, T Weber, A Zang, T Michel, Journal of Instrumentation, Vol. 9 (05), 2014
• "Simulation framework for coherent and incoherent X-ray imaging and its application in Talbot-Lau dark-field imaging", André Ritter, Peter Bartl, Forian Bayer, Karl C Gödel, Wilhelm Haas, Thilo Michel, Georg Pelzer, Jens Rieger, Thomas Weber, Andrea Zang, et al., Optics express, Vol. 22 (19), 2014
• "Projection angle dependence in grating-based X-ray dark-field imaging of ordered structures", Florian Bayer, Simon Zabler, Christian Brendel, Georg Pelzer, Jens Rieger, André Ritter, Thomas Weber, Thilo Michel, Gisela Anton, Optics express, Vol. 21 (17), 2013
• "Increasing the darkfield contrast-to-noise ratio using a deconvolution-based information retrieval algorithm in X-ray grating-based phase-contrast imaging", Thomas Weber, Georg Pelzer, Florian Bayer, Florian Horn, Jens Rieger, André Ritter, Andrea Zang, Jürgen Durst, Gisela Anton, Thilo Michel, Optics Express, Vol. 21 (15), 2013
• "On a dark-field signal generated by micrometer-sized calcifications in phase-contrast mammography", Thilo Michel, Jens Rieger, Gisela Anton, Florian Bayer, Matthias W Beckmann, Jürgen Durst, Peter A Fasching, Wilhelm Haas, Arndt Hartmann, Georg Pelzer, et al., Physics in Medicine & Biology, Vol. 58 (8), 2013
• "Grating-based x-ray phase-contrast imaging with a multi energy-channel photon-counting pixel detector", Georg Pelzer, Thomas Weber, Gisela Anton, Rafael Ballabriga, Florian Bayer, Michael Campbell, Thomas Gabor, Wilhelm Haas, Florian Horn, Xavi Llopart, et al., Optics Express, Vol. 21 (22), 2013
• "Simultaneous maximum-likelihood reconstruction for x-ray grating based phase-contrast tomography avoiding intermediate phase retrieval", André Ritter, Florian Bayer, Jürgen Durst, Karl Gödel, Wilhelm Haas, Thilo Michel, Jens Rieger, Thomas Weber, Lukas Wucherer, Gisela Anton, arXiv preprint arXiv:1307.7912, 2013
• "Grating-based darkfield imaging of human breast tissue", Gisela Anton, Florian Bayer, Matthias W Beckmann, Jürgen Durst, Peter A Fasching, Wilhelm Haas, Arndt Hartmann, Thilo Michel, Georg Pelzer, Marcus Radicke, et al., Zeitschrift für Medizinische Physik, Vol. 23 (3), 2013
• "Energy-dependent visibility measurements, their simulation and optimisation of an X-ray Talbot-Lau Interferometer", T Weber, F Bayer, W Haas, G Pelzer, J Rieger, André Ritter, L Wucherer, J Durst, T Michel, G Anton, Journal of Instrumentation, Vol. 7 (02), 2012
• "Measurements and simulations analysing the noise behaviour of grating-based X-ray phase-contrast imaging", T Weber, P Bartl, J Durst, W Haas, T Michel, André Ritter, G Anton, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 648, 2011
• "Simulation and measurement of grating-based X-ray phase-contrast imaging", P Bartl, F Bayer, J Durst, W Haas, T Michel, G Pelzer, André Ritter, T Weber, G Anton, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 648, 2011
• "Noise in x-ray grating-based phase-contrast imaging", Thomas Weber, Peter Bartl, Florian Bayer, Jürgen Durst, Wilhelm Haas, Thilo Michel, André Ritter, Gisela Anton, Medical physics, Vol. 38 (7), 2011
• "Grating-based high energy X-ray interferometry with the Medipix-detector in simulation and measurement", P Bartl, F Bayer, J Durst, W Haas, T Michel, André Ritter, T Weber, G Anton, Journal of Instrumentation, Vol. 5 (10), 2010
• "New Possibilities in Medical X-Ray Imaging with Photon Counting Pixel Detectors", J Durst, P Bartl, E Guni, W Haas, André Ritter, P Takoukam Talla, T Weber, T Michel, G Anton, 2010