Publications

N. De Zanche, N. van den Berg, et al. (2022)
ISMRM Best Practices for Safety Testing of Experimental RF Hardware
International Society for Magnetic Resonance in Medicine (ISMRM), DOI 10.7939/r3-7vpe-x737

Stephan Orzada, Safi Akash, Thomas M. Fiedler, Fabian J. Kratzer, Mark E. Ladd (2022)
An investigation into the dependence of virtual observation point-based specific absorption rate calculation complexity on number of channels
Magnetic Resonance in Medicine, DOI: 10.1002/mrm.29434

Jonathan K. Stelter, Mark E. Ladd, Thomas M Fiedler (2022)
Numerical comparison of local transceiver arrays of fractionated dipoles and microstrip antennas for body imaging at 7 T
NMR in Biomedicine, https://doi.org/10.1002/nbm.4722

Thomas M. Fiedler, Stephan Orzada, Martina Flöser, Stefan H. G. Rietsch, Simon Schmidt, Jonathan K. Stelter, Marco Wittrich, Harald H. Quick, Andreas K. Bitz, Mark E. Ladd (2021)
Performance and safety assessment of an integrated transmit array for body imaging at 7 T under consideration of specific absorption rate, tissue temperature, and thermal dose
NMR in Biomedicine, https://doi.org/10.1002/nbm.4656

Thomas M. Fiedler, Stephan Orzada, Martina Flöser, Stefan H. G. Rietsch, Harald H. Quick, Mark E. Ladd, and Andreas K. Bitz (2021)
Performance Analysis of Integrated RF Micro Stripline Transmit Arrays with High Channel Count for Body Imaging at 7 Tesla
NMR in Biomedicine, https://doi.org/10.1002/nbm.4515

Stephan Orzada, Thomas M. Fiedler, Harald H. Quick, Mark E. Ladd (2021)
Post‐processing algorithms for specific absorption rate compression
Magnetic Resonance in Medicine 86 (5), 2853-2861

Stephan Orzada, Thomas M. Fiedler, Harald H. Quick, Mark E. Ladd (2021)
Local SAR compression algorithm with improved compression, speed and flexibility
Magnetic resonance in medicine 86 (1), 561-568

T. M. Fiedler, M. E. Ladd, M. Clemens, A. K. Bitz (2020)
Safety of subjects during radiofrequency exposure in ultra-high-field magnetic resonance imaging
IEEE Letters on Electromagnetic Compatibility Practice and Applications ( Volume: 2, Issue: 3, Sept. 2020)

Stephan Orzada, Thomas M Fiedler, Andreas K Bitz, Mark E Ladd, Harald H Quick (2020)
Local SAR compression with overestimation control to reduce maximum relative SAR overestimation and improve multi-channel RF array performance
Magn Reson Mater Phy, https://doi.org/10.1007/s10334-020-00890-0

Stephan Orzada, Klaus Solbach, Marcel Gratz, Sascha Brunheim, Thomas M. Fiedler, Sören Johst, Andreas K. Bitz, Samaneh Shooshtary, Ashraf Abuelhaija, Maximilian N. Voelker, Stefan H. G. Rietsch, Oliver Kraff, Stefan Maderwald, Martina Flöser, Mark Oehmigen, Harald H. Quick, Mark E. Ladd (2019)

A 32-channel parallel transmit system add-on for 7T MRI
PLoS ONE14(9):e0222452.https://doi.org/10.1371/ journal.pone.0222452

Thomas M. Fiedler, Mark E. Ladd, Andreas K. Bitz (2018)
SAR Simulations and Safety
Review Article, NeuroImage 168 (2018) 33-58: Special Issue "Neuroimaging with Ultra-High Field MRI: Present and Future", DOI: 10.1016/j.neuroimage.2017.03.035

Sascha Brunheim, Marcel Gratz, Sören Johst, Andreas K. Bitz, Thomas M. Fiedler, Mark E. Ladd, Harald H. Quick, Stephan Orzada (2017)
Fast and accurate multi-channel B1+ mapping based on the TIAMO technique for 7 Tesla UHF body MRI
MRM, DOI: 10.1002/mrm.26925

Tanja Platt, Reiner Umathum, Thomas M. Fiedler, Armin M. Nagel, Andreas K. Bitz, Florian Maier, Peter Bachert, Mark E. Ladd, Mark O. Wielpütz, Hans-Ulrich Kauczor, Nicolas G.R. Behl (2018)
In Vivo Self-Gated 23Na MRI at 7 T Using an Oval-Shaped Body Resonator
MRM, DOI: 10.1002/mrm.27103

Thomas M. Fiedler, Mark E. Ladd, Andreas K. Bitz (2017)
RF safety assessment of a bilateral 4-channel transmit/receive 7 Tesla breast coil: SAR versus tissue temperature limits
Medical Physics 44 (1), DOI: 10.1002/mp.12034

Yacine Noureddine, Oliver Kraff, Mark E. Ladd, Karsten H. Wrede, Bixia Chen, Harald H. Quick, Gregor Schaefers, Andreas K. Bitz. (2018)
In vitro and in silico assessment of RF-induced heating around intracranial aneurysm clips at 7 Tesla.
Magn Reson Med, 79:568–581, DOI: 10.1002/mrm.2665

Stephan Orzada, Mark E. Ladd, Andreas K. Bitz (2017)
A method to approximate maximum local SAR in multichannel transmit MR systems without transmit phase information.
Magn Reson Med, 78:805–811, doi: 10.1002/mrm.2639

Stephan Orzada, Andreas K. Bitz, Sören Johst, Marcel Gratz, Maximilian N. Völker, Oliver Kraff, Ashraf Abuelhaija, Thomas M. Fiedler, Klaus Solbach, Harald H. Quick and Mark E. Ladd (2017)
Analysis of an integrated 8-channel Tx/Rx body array for use as a body coil in 7-Tesla MRI
Frontiers in Physics, June 2017, Vol. 5, Article 17, DOI: 10.3389/fphy.2017.00017.

Oliver Kraff, Karsten H. Wrede, Tobias Schoemberg, Philipp Dammann, Yacine Noureddine, Stephan Orzada, Mark E. Ladd, Andreas K. Bitz (2013)
MR safety assessment of potential RF heating from cranial fixation plates at 7 T.
Med. Phys. 40 (4), April 2013, doi: 10.1118/1.4795347.

Thomas M. Fiedler, Martina Flöser, Stefan Rietsch, Stephan Orzada, Harald Quick, Mark Ladd, Andreas K. Bitz (2017)
Comparison of a 32‐channel remote body coil for 7 Tesla with local and remote 8‐ and 16‐channel transmit coil arrays
ISMRM 25th Annual Meeting 2017, Honolulu, USA, #4306

Thomas Fiedler, Stephan Orzada, Martina Flöser, Harald Quick, Mark Ladd, Andreas K. Bitz (2017)
RF safety assessment of a 32‐channel integrated body coil for 7 Tesla: Thermal dose evaluation at high SAR level
ISMRM 25th Annual Meeting 2017, Honolulu, USA, #5577

Stephan Orzada, Andreas Bitz, Marcel Gratz, Sören Johst, Samaneh Shooshtary, Maximilian Voelker, Stefan Rietsch, Martina Flöser, Ashraf Abuelhaija, Mark Oehmigen, Sascha Brunheim, Thomas Fiedler, Oliver Kraff, Harald Quick, Klaus Solbach, Mark Ladd (2017)
A 32-Channel Transmit System Add-On for 7 Tesla Body Imaging
ISMRM 25th Annual Meeting 2017, Honolulu, USA, #1219

Thomas M. Fiedler, Sascha Brunheim, Martina Flöser, Mark E. Ladd, Stephan Orzada, Harald H. Quick, Andreas K. Bitz
RF safety assessment of a 32-channel whole-body transmit array at 7 Tesla
10th Anniversary of the Erwin L. Hahn Lecture 2016, Essen, Germany

Thomas M. Fiedler, Mark E. Ladd, Andreas K. Bitz
Comparison of SAR, Tissue Temperature and Thermal Dose in Local and Remote 8‐ch Body Arrays ISMRM Workshop on: Ultra High Field MRI: Technological Advances & Clinical Applications
06 - 09 March 2016, Heidelberg, Germany

Stephan Orzada, Andreas K. Bitz, Oliver Kraff, Mark Oehmigen, Marcel Gratz, Sören Johst, Maximilian Völker, Stefan Rietsch, Martina Flöser, Thomas M. Fiedler, Samaneh Shooshtary, Klaus Solbach, Harald Quick, Mark E. Ladd
A 32-Channel Integrated Body Coil for 7 Tesla Whole-Body Imaging
ISMRM 24rd Annual Meeting 2016, Singapore

Thomas M. Fiedler, Mark E. Ladd, Andreas K. Bitz
RF safety assessment of a 7 Tesla breast coil: SAR versus tissue temperature limits
ISMRM 24rd Annual Meeting 2016, Singapore, #3666

Thomas M. Fiedler, Mark E. Ladd, Andreas K. Bitz
Local SAR increase in the human head induced by high-permittivity pads at the sodium (23Na) resonance frequency at 7 Tesla
ISMRM 24rd Annual Meeting 2016, Singapore, #3663

Thomas M. Fiedler, Mark E. Ladd, Andreas K. Bitz
Local SAR elevations in the human head induced by high-permittivity pads at 7 Tesla
ISMRM 23rd Annual Meeting 2015, Toronto, Canada, 30.05-05.06.2015 #3213
ISMRM Merit Award: Magna cum laude

Thomas M. Fiedler, Aaron S. Kujawa, Frank Resmer, Patrick Stein, Titus Lanz, Mark E. Ladd, Andreas K. Bitz (2015)
RF safety assessment of a bilateral 4-channel Tx/Rx 7T breast coil
ISMRM 23rd Annual Meeting 2015, Toronto, Canada, 30.05-05.06.2015, #3233

Andreas K. Bitz, Oliver Kraff, Stephan Orzada, Tim Herrmann, Johannes Mallow, Johannes Bernarding, and Mark E. Ladd (2014)
RF safety evaluation of different configurations of high-permittivity pads used to improve imaging of the cerebellum at 7 Tesla
Proc. Intl. Soc. Mag. Reson. Med. 22 (2014), # 4892

Andreas K. Bitz, Rene Gumbrecht, Stephan Orzada, Hans-Peter Fautz, Mark E. Ladd (2013)
Evaluation of Virtual Observation Points for Local SAR Monitoring of Multi-Channel Transmit RF Coils at 7 Tesla
Proc. Intl. Soc. Mag. Reson. Med. 21 (2013), #4414

Andreas K. Bitz, Irina Brote, Stephan Orzada, Oliver Kraff, Stefan Maderwald, Harald H. Quick,
Klaus Solbach, Achim Bahr, Hans-Peter Fautz, Franz Schmitt, Mark E. Ladd
Comparison of simulation-based and measurement-based RF shimming for whole-body MRI at 7 Tesla
Proc. Intl. Soc. Mag. Reson. Med. 18 (2010), # 4720

Andreas K. Bitz, Irina Brote, Stephan Orzada, Oliver Kraff, Stefan Maderwald, Harald H. Quick, P. Yazdanbakhsh, Klaus Solbach, A. Bahr, T. Bolz, K. Wicklow, Franz Schmitt, and Mark E. Ladd
An 8-channel add-on RF shimming system for whole-body 7 Tesla MRI including real-time SAR monitoring
Proc. Intl. Soc. Mag. Reson. Med. 17 (2009), # 4767