Dr. Johannes Fischer
Medical Physics
Department of Radiology
Medical Center – University of Freiburg
Killianstr. 5a
79106 Freiburg
Tel.: +49 761 270-93830
E-Mail
Journal Papers / Thesis
in press
- Eric Arbes, Ariel Hannum, Johannes Fischer, Qingping Chen, Sebastian Littin, Alexander Maier, Michael Bock, Simon Reiss
Comparative Performance Analysis of an Open Source Motion-Compensated Cardiac Diffusion Sequence Across Different MRI Systems and Gradient Strengths—A Pilot Study
Magnetic Resonance in Medicine, in press
2026
- Johannes Fischer, Paula L. Jordan, Fiona Stritt, Bernhard Richter, Louisa Traser, Michael Bock
Dynamic 3D MRI for vocal fold oscillation measurements
Zeitschrift für Medizinische Physik (2026) - Louisa Traser, Fiona Stritt, Paula L. Jordan, Marie Köberlein, Jonas Kirsch, Stefanie Rummel, Zhaoyan Zhang, Bernhard Richter, Michael Bock, Johannes Fischer, Matthias Echternach
Dynamic 3D MRI of vocal fold oscillations: In vivo assessment of vocal fold thickness, contact area, and glottal area waveform across phonation types in comparison with high-speed imaging
The Journal of the Acoustical Society of America 159(5), 4325-4340 (2026) - Louisa Traser, Daniel Priegnitz, Fiona Stritt, Johannes Fischer, Michael Bock, Hanspeter Herzel, Dirk Mürbe, Bernhard Richter, Matthias Echternach, Mario Fleischer
Vocal tract configuration and acoustic transfer characteristics in mechanisms of extreme vocal styles—A pilot study
The Journal of the Acoustical Society of America 160(2), 1733-1744 (2026) - Niklas Wehkamp, Patrick Hucker, Johannes Fischer, Andreas Greiner, Jon-Fredrik Nielsen, Maxim Zaitsev, Robert Dehnert
Comment: naming convention for gradient system transfer function and gradient system frequency response for magnetic resonance imaging encoding field characterization
Magnetic Resonance Materials in Physics, Biology and Medicine (2026)
2025
- Kian Tadjalli Mehr, Johannes Fischer, Felix Spreter, Simon Reiss, David Boll, Ali Caglar Özen, Deepa Gunashekar, Constantin von zur Mühlen, Alexander Maier, Michael Bock
Radial Hadamard-encoded 19F-MRI
Magnetic Resonance Materials in Physics, Biology and Medicine 38(6), 1011-1021 (2025) - Zirun Wang, Martin Grashei, Johannes Fischer, Sandra Sühnel, Nadine Setzer, Marcel Awenius, Andreas Korzowski, Ali C. Özen, Maxim Zaitsev, Michael Bock, Franz Schilling, Andreas B. Schmidt, Christoph A. Müller
Radial multi-echo bSSFP and IDEAL chemical shift separation in k-space for high-speed 3D hyperpolarized 13C metabolic MRI
Magnetic Resonance in Medicine 94(5), 2190-2200 (2025)
2023
- Samantha Hickey, Andreas Reichert, Wolfgang Ptacek, Lars Bielak, Simon Reiss, Johannes Fischer, Deepa Darshini Gunashekar, Thomas Bortfeld, Michael Bock
Simultaneous T2-weighted real-time MRI of two orthogonal slices
Magnetic Resonance in Medicine 90(6), 2388-2399 (2023) - Ali Caglar Özen, Felix Spreter, Waldemar Schimpf, Johannes Fischer, Serhat Ilbey, Simon Reiss, Alexander Maier, Dominik von Elverfeldt, Timo Heidt, Constantin von zur Mühlen, Michael Bock
Scalable and modular 8-channel transmit and 8-channel flexible receive coil array for 19F MRI of large animals
Magnetic Resonance in Medicine 89(3), 1237-1250 (2023)
2022
- Johannes Fischer
Dynamic MRI of the vocal fold oscillation with sub-millisecond temporal resolution
PhD thesis, University of Freiburg (2022) - Johannes Fischer, Ali Caglar Özen, Serhat Ilbey, Louisa Traser, Matthias Echternach, Bernhard Richter, Michael Bock
Sub-millisecond 2D MRI of the vocal fold oscillation using single-point imaging with rapid encoding
Magnetic Resonance Materials in Physics, Biology and Medicine 35(2), 301-310 (2022) - Serhat Ilbey, Pia M. Jungmann, Johannes Fischer, Matthias Jung, Michael Bock, Ali Caglar Özen
Single point imaging with radial acquisition and compressed sensing
Magnetic Resonance in Medicine 87(6), 2685-2696 (2022) - Thomas Lottner, Simon Reiss, Stefan B. Rieger, Martin Schuettler, Johannes Fischer, Lars Bielak, Ali C. Özen, Michael Bock
Radio-frequency induced heating of intra-cranial EEG electrodes: The more the colder?
NeuroImage 264, 119691 (2022)
2021
- Andreas G. Nerlich, Andreas Saleh, Pascale Röcker, Heike Freidank, Johannes Fischer, Michael Bock, Stephanie Panzer, Oliver Peschel
Experimental Mummification Using Herodotus Description - A 7 Year Longterm Experience of a Human-Sized Animal Model
Pharmacy and Medicine in Ancient Egypt: Proceedings of the Conference Held in Barcelona, 68-77 (2021)
2020
- Johannes Fischer, Timo Abels, Ali Caglar Özen, Matthias Echternach, Bernhard Richter, Michael Bock
Magnetic resonance imaging of the vocal fold oscillations with sub-millisecond temporal resolution
Magnetic Resonance in Medicine 83(2), 403-411 (2020) - Agazi Samuel Tesfai, Johannes Fischer, Ali Caglar Özen, Patrick Eppenberger, Lena Oehrstroem, Frank Rühli, Ute Ludwig, Michael Bock
Multi-parameter Analytical Method for B1 and SNR Analysis (MAMBA): An open source RF coil design tool
Journal of Magnetic Resonance 319, 106825 (2020)
2019
- Lars Bielak, Nicole Wiedenmann, Nils Henrik Nicolay, Thomas Lottner, Johannes Fischer, Hatice Bunea, Anca-Ligia Grosu, Michael Bock
Automatic Tumor Segmentation With a Convolutional Neural Network in Multiparametric MRI: Influence of Distortion Correction
Tomography 5(3), 292-299 (2019)
2016
- Hui-Hsin Hsiao, Aimi Abass, Johannes Fischer, Rasoul Alaee, Andreas Wickberg, Martin Wegener, Carsten Rockstuhl
Enhancement of second-harmonic generation in nonlinear nanolaminate metamaterials by nanophotonic resonances
Optics Express 24(9), 9651-9659 (2016)
Conference Contributions (peer reviewed) / Abstracts
2026
- Eric Arbes, Simon Reiss, Kian Tadjalli Mehr, Ariel J Hannum, Johannes Fischer, Michael Bock
An Open-source Accelerated Free Breathing Cardiac Diffusion PROPELLER EPI Sequence with Rotating Single-Shot Acquisitions
Proc. ISMRM 34, Cape Town (2026) - Paula L. Jordan, Johannes Fischer, Fiona Stritt, Bogac Tur, Marion Semmler, Stefan Kniesburges, Louisa Traser, Bernhard Richter, Michael Bock
Evaluating temporal resolution of dynamic ZTE using an MR-compatible vocal fold phantom
Proc. ISMRM 34, Cape Town (2026) - Paula L. Jordan, Johannes Fischer, Fiona Stritt, Bogac Tur, Marion Semmler, Matthias Echternach, Louisa Traser, Stefan Kniesburges, Bernhard Richter, Michael Bock
Sub-millisecond ZTE MRI for Dynamic Vocal Fold Surface Measurements: Comparison with Structured Light 3D Endoscopy
Proc. ISMRM 34, Cape Town (2026) - Sebastian Littin, Feng Jia, Shadi Tashakori, Andreas Holl, David Schote, Mojtaba Shafiekhani, Helge Herthum, Baki Karaböce, Oguzhan Kizilbey, Philipp Amrein, Johannes Fischer, Lukas Winter, Maxim Zaitsev
Open Source Gradient System for the OSI2 MRI Scanner
Proc. ISMRM 34, Cape Town (2026) - Felix Spreter, Kian Tadjalli Mehr, Johannes Fischer, Ali Caglar Özen, Michael Bock, Simon Reiss
Improved Catheter Localization using Coil Tracking in Tx-mode
Proc. ISMRM 34, Cape Town (2026) - Kian Tadjalli Mehr, Ali Caglar Özen, Felix Spreter, David Boll, Simon Reiss, Lisa Regler, Johannes Fischer, Alexander Maier, Michael Bock
A Homogeneous Perfluorocarbon Phantom for Quantitative 19F MRI of Large Animals
Proc. ISMRM 34, Cape Town (2026) - Kian Tadjalli Mehr, Felix Spreter, Simon Reiss, Johannes Fischer, Ali Caglar Özen, Natalie Hoppe, Gunjan Arya, Alexander Maier, Michael Bock
Multicolor 19F MRI using Spectral Hadamard-Encoding
Proc. ISMRM 34, Cape Town (2026)
2025
- Eric Aarbes, Simon Reiss, Ariel J. Hannum, Johannes Fischer, Qingping Chen, Michael Bock
An Open Source Motion-compensated Cardiac Diffusion Sequence Validated Across Different MRI Systems and Gradient Strengths
Proc. ISMRM 33, Honolulu (2025) - Johannes Fischer, Benedikt Thomann, Ute Ludwig, Tobias Fechter, Dimos Baltas, Michael Bock
Single-isocenter Multi-target Stereotactic Radiotherapy: An MR Gel Dosimetry Protocol to Evaluate Accuracy
Proc. ISMRM 33, Honolulu (2025) - Paula L. Jordan, Johannes Fischer, Fiona Stritt, Marie Köberlein, Louise Traser, Bernhard Richter, Michael Bock
Quantification of the Vocal Fold Oscillations from 3D-isotropic Sub-millimeter Sub-millisecond MRI
Proc. ISMRM 33, Honolulu (2025) - Simon Reiss, Fritz Koch, Felix Spreter, Johannes Fischer, Enaam Chleilat, Peter Kohl, Michael Bock
Towards MR-guided Pulsed Field Ablation: Lesion Characterization with LGE and Demonstration of an MR-compatible Interventional Setup
Proc. ISMRM 33, Honolulu (2025) - Felix Spreter, Simon Reiss, Johannes Fischer, Alexander Maier, Michael Bock
Feasibility of Dynamic Intra-Arterial Spin Labeling for Highly Time Resolved Angiography
Proc. ISMRM 33, Honolulu (2025) - Kian Tadjalli Mehr, Felix Spreter, Simon Reiss, Johannes Fischer, David Boll, Ali Caglar Özen, Constantin von zur Mühlen, Alexander Maier, Michael Bock
Towards in vivo quantitative19F MRI in the Spleen
Proc. ISMRM 33, Honolulu (2025) - Zirun Wang, Christoph A. Müller, Johannes Fischer, Martin Grashei, Sandra Sühnel, Nadine Setzer, Franz Schilling, Marcel Awenius, Andreas Korzowski, Ali Caglar Özen, Maxim Zaitsev, Michael Bock, Andreas Schmidt
Fast 3D Hyperpolarized Carbon-13 Metabolic MRI with Enhanced Spatio-Temporal Resolution Using Radial Multi-Echo bSSFP and PSF Optimization
Proc. ISMRM 33, Honolulu (2025) - Niklas Wehkamp, Qingping Chen, Patrick Hucker, Johannes Fischer, Sebastian Littin, Jon-Frederik Nielsen, Maxim Zaitsev
EPI gradient trajectory noise measurement and simulation of related artifacts
Proc. ISMRM 33, Honolulu (2025)
2024
- Johannes Fischer, Kian Tadjalli Mehr, Louisa Traser, Bernhard Richter, Michael Bock
Isotropic 3D Sub-millimeter MRI of the Vocal Fold Oscillation with Sub-millisecond Temporal Resolution
Proc. ISMRM 32, Singapore (2024) - Felix Spreter, Simon Reiss, Johannes Fischer, Ali Caglar Özen, Alexander Maier, Michael Bock
Optimizing catheter based pulse application for intra-Arterial-Spin-Labeling in coronary arteries
Proc. ISMRM 32, Singapore (2024) - Kian Tadjalli Mehr, Ali Caglar Özen, Johannes Fischer, Simon Reiss, Felix Spreter, David Boll, Constantin von zur Mühlen, Michael Bock, Alexander Maier
A 3D Golden-Angle Radial Sequence for in vivo Hadamard-encoded 19F MRI in a Porcine Model
Proc. ISMRM 32, Singapore (2024) - Kian Tadjalli Mehr, Johannes Fischer, Ali Caglar Özen, Simon Reiss, Alexander Maier, Constantin von zur Mühlen, Michael Bock
Optimizing Hadamard-Encoded 19F MRI for PFOB Imaging of Monocytes
Proc. ISMRM 32, Singapore (2024) - Zirun Wang, Martin Grashei, Johannes Fischer, Sühnel Sandra, Nadine Setzer, Marcel Awenius, Andreas Korzowski, Maxim Zaitsev, Michael Bock, Franz Schilling, Andreas Schmidt, Christoph Müller
Hyperpolarized 13C 3D MRSI using Radial Multi-echo bSSFP and k-Space-based IDEAL
Proc. ISMRM 32, Singapore (2024)
2022
- Johannes Fischer, Michael Bock
MRI with Sub-Millisecond Temporal Resolution: SPIRE Imaging of a High-speed Motion Phantom
Proc. ISMRM 30, London (2022) - Serhat Ilbey, Ali Caglar Özen, Pia Jungmann, Johannes Fischer, Matthias Jung, Michael Bock
Sampling Mask Optimization for Compressed Sensing PETRA MRI
Proc. ISMRM 30, London (2022) - Thomas Lottner, Simon Reiss, Stefan Rieger, Johannes Fischer, Lars Bielak, Ali Caglar Özen, Martin Schüttler, Michael Bock
RF Heating of Multi-channel icEEG Electrodes
Proc. ISMRM 30, London (2022) - Andreas Reichert, Samantha Hickey, Johannes Fischer, Michael Vogele, Simon Reiss, Michael Bock
Passive Real-Time Needle Tracking and Needle Tip Estimation
Proc. ISMRM 30, London (2022) - Simon Reiss, Johannes Fischer, Julien Thielmann, Thomas Lottner, Timo Heidt, Constantin von zur Mühlen, Michael Bock
Sample Extraction of ex vivo Myocardial Tissue: Combination of High Resolution MRI with 3D-printed Guides
Proc. ISMRM 30, London (2022) - Agazi Tesfai, Johannes Fischer, Ali Caglar Özen, Sébastien Bär, Patrick Eppenberger, Lena Öhrström, Frank Rühli, Ute Ludwig, Michael Bock
Comparison of ultra-high field MRI of ancient remains at 9.4T and 3T
Proc. ISMRM 30, London (2022) - Ali Caglar Özen, Johannes Fischer, Simon Reiss, Thomas Lottner, Alexander Maier, Waldemar Schimpf, Timo Heidt, Constantin von zur Mühlen, Michael Bock
Scalable and Modular 8-Channel Transmit and 8-Channel Flexible Receive Coil Array for 19F-MRI of Myocardial Infarction Studies in Large Animals
Proc. ISMRM 30, London (2022)
2021
- Johannes Fischer, Ali Caglar Özen, Matthias Echternach, Louisa Traser, Bernhard Richter, Michael Bock
2.5D MRI of the Vocal Fold Oscillation using Single Point Imaging with Rapid Encoding
Proc. ISMRM 29, Virtual (2021) - Serhat Ilbey, Johannes Fischer, Michael Bock, Ali Caglar Özen
Compressed Sensing PETRA MRI
Proc. ISMRM 29, Virtual (2021) - Thomas Lottner, Johannes Fischer, Simon Reiss, Lars Bielak, Timo Heidt, Ali Caglar Özen, Julien Thielmann, Constantin von zur Mühlen, Michael Bock
Multi-Echo GRASP for Cardiac T2*-Relaxometry
Proc. ISMRM 29, Virtual (2021) - Hao Song, Burak Akin, Johannes Fischer, Ali Caglar Özen, Stefan Schumann, Michael Bock
Measuring CMRO2 in Brain Subcortical Structures Using Dynamic 17O-MRI
Proc. ISMRM 29, Virtual (2021) - Agazi Samuel Tesfai, Johannes Fischer, Ali Caglar Özen, Patrick Eppenberger, Lena Maria Öhrström, Frank Rühli, Ute Ludwig, Michael Bock
MRI and CT in an Ancient Child Mummy: Contrast Combination to Increase Tissue Differentiation
Proc. ISMRM 29, Virtual (2021)
2020
- Johannes Fischer, Michael Bock
Single Point Imaging with Rapid Encoding (SPIRE) for MRI with Sub-millisecond Temporal Resolution
Proc. ISMRM 28, Virtual (2020) - Johannes Fischer, Ali Caglar Özen, Matthias Echternach, Bernhard Richter, Michael Bock
Sub-millisecond 2D MRI of the Vocal Fold Oscillation using Single Point Imaging with Rapid Encoding (SPIRE)
Proc. ISMRM 28, Virtual (2020) - Hao Song, Yanis Taege, Johannes Fischer, Ali Caglar Özen, Michael Bock
Regional Analysis of CMRO2 in Human Brain Using Dynamic 17O-MRI
Proc. ISMRM 28, Virtual (2020) - Agazi Samuel Tesfai, Andreas Vollmer, Moritz Braig, Johannes Fischer, Ute Ludwig, Michael Bock
Visibility of artificial dental side root canals using MRI
Proc. ISMRM 28, Virtual (2020) - Ali Caglar Özen, Johannes Fischer, Hao Song, Yanis Tage, Christian Schuch, Rianne Schutter, Cyril Moers, Ronald Borra, Michael Bock
A Dedicated 17O Rx Array to Assess Renal Metabolism of Donor Kidneys
Proc. ISMRM 28, Virtual (2020)
2019
- Johannes Fischer, Ali Caglar Özen, Matthias Echternach, Bernhard Richter, Michael Bock
Highspeed Imaging of the Vocal Folds Oscillations with Image-based Motion Correction
Proc. ISMRM 27, Montréal (2019) - Johannes Fischer, Agazi Samuel Tesfai, Ute Ludwig, Philippe Fabian Müller, Arkadiusz Miernik, Michael Bock
Kidney stone discrimination using ultrashort TE MRI
Proc. ISMRM 27, Montréal (2019) - Yanis Taege, Johannes Fischer, Ali Caglar Özen, Hao Song, Christian Schuch, Rianne Schutter, Cyril Moers, Ronald Borra, Michael Bock
Protocol Optimization for Functional 17O-MRI of Donor Kidneys at 3T
Proc. ISMRM 27, Montréal (2019) - Agazi Samuel Tesfai, Johannes Fischer, Ali Caglar Özen, Ute Ludwig, Michael Bock
Multiparameter Analysis Method for B1 Acquisition (MAMBA): A tool for RF coil design and SNR estimation for short T2* samples
Proc. ISMRM 27, Montréal (2019)
2018
- Johannes Fischer, Timo Abels, Ali Caglar Özen, Matthias Echternach, Bernhard Richter, Michael Bock
Highspeed Imaging with Sub-millisecond Temporal Resolution of the Vocal Folds Oscillations using EGG-Gated Gradient Echo with Rapid Phase Encoding
Proc. ISMRM 26, Paris (2018) - Dmitry Kurzhunov, Jan Sedlacik, Robert Borowiak, Divya Bolar, Johannes Fischer, Ali Caglar Özen, Michael Bock
Quantification of Oxygen Metabolism in Human Brain: Comparison of Direct 17O with Indirect 1H MR Method
Proc. ISMRM 26, Paris (2018) - Agazi Samuel Tesfai, Johannes Fischer, Ali Caglar Özen, Ute Ludwig, Michael Bock
Effects of Reduced Dead Times on the SNR of Tissue with Short T2* values
Proc. ISMRM 26, Paris (2018) - Gao Xiang, Philipp Amrein, Johannes Fischer, Davide Piccini, Patrick Hucker, Ute Ludwig, Jan-Bernd Hövener, Maxim Zaitsev
Ultra-High-Resolution Dental MR Imaging Using an Ultra-Short-TE Sequence with Prospective Motion Correction
Proc. ISMRM 26, Paris (2018)
2017
- Johannes Fischer, Ali Caglar Özen, Dmitry Kurzhunov, Marco Reisert, Agazi Tesfai, Frank Rühli, Ute Ludwig, Michael Bock
Cross-Modality MR Image Reconstruction: CT-Constrained Anisotropic Diffusion to Preserve Edge Information in MRI of an Ancient Mummified Hand
Proc. ISMRM 25, Honolulu (2017) - Agazi Tesfai, Johannes Fischer, Ali Caglar Özen, Michael Bock
Comparison of Different RF Coil Designs for Short T2* Samples
Proc. ISMRM 25, Honolulu (2017)
DFG
Ultraschnelle dynamische 3-dimensionale Magnetresonanztomographie der Stimmlippenschwingung (Role: PI) 525074946.