Cape Town - 2026 ISMRM-ISMRT Annual Meeting and Exhibition - Parallel Transmission at High Fields

Parallel Transmission at High Fields

Power Pitch

Physics & Engineering

Tuesday, 12 May 2026

Power Pitch Theatre 1

08:20 - 09:56

Moderators: Franck Mauconduit & Ulrich Katscher

Session Number: 451-01

No CME/CE Credit

Similar Sessions

This session is a collection of recent advances in parallel transmission at high fields

08:20		451-01-001. Wrapped Gaussian Process interpolation for Large-Tip-Angle PTx Pulse Design Jianxiang Chen, Chris Rodgers University of Cambridge, Cambridge, United Kingdom Impact: Our surrogate model overcomes the core speed-accuracy trade-off by replacing the computationally intensive Bloch simulation. This demonstrates the potential for future incorporation in a hybrid workflow combining offline pre-computation with rapid, subject-specific online pulse design.
08:22		451-01-002. Deep learning predicted parallel transmission pulses for a 3D turbo spin echo sequence at 7T Sophia Nagelstraßer, Nico Egger, Jürgen Herrler, Mads Sloth Vinding, Patrick Liebig, Michael Uder, Armin NAGEL University Hospital Erlangen (UKER), Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany Impact: This study demonstrates that a neural network trained on in vivo B₁⁺and B₀maps is able to predict dynamic, tailored pTx pulses for a 3D turbo spin echo sequence at 7T, achieving excitation homogeneity currently comparable to universal pulses.
08:24		451-01-003. Deep learning for the rapid design of tailored dynamic pTx multiband excitation pulses Joseph Bartlett, Catherine Davey, Yasmin Blunck, Jinming Duan, Leigh Johnston, Simon Levy University of Melbourne, Melbourne, Australia Impact: Deep learning designed multiband pTx pulses are shown to achieve similar NRMSE and SAR to single-band, paving the way for seamless integration of subject-specific and slice-specific dynamic pTx pulses, designed to handle B₁⁺ inhomogeneities in whole-brain 2D imaging at 7T.
08:26		451-01-004. Joint Optimization of Parallel Transmit RF Pulses and Gradient Waveforms for 2D Spatially Selective Excitation Yuliang Xiao, Jason Rock, Tim Zhe Wu, Jamie Near, Mark Chiew, Simon Graham Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Canada Impact: Unifying multi-channel radiofrequency and gradient optimization within a self-supervised learning framework enables the design of high-fidelity spatially selective radiofrequency pulses. The proposed approach achieves precise excitation patterns, advancing the practicality of reduced field-of-view MRI for a wide range of applications.
08:28		451-01-005. Hard-Constrained Parallel Transmit Design with Unrolled Homeomorphic Projection Junno Yun, Toygan Kilic, Jürgen Herrler, Patrick Liebig, Kamil Ugurbil, Mehmet Akcakaya University of Minnesota, Minneapolis, United States of America Impact: The proposed novel hard-constrained end-to-end deep learning framework for parallel transmit design achieves accurate homogeneous flip-angle maps strictly within RF safety constraints, presenting a promising direction for mitigating transmit field inhomogeneities and reducing computation time in ultra-high field MRI.
08:30		451-01-006. A Transform-Domain Modal Decomposition Strategy for RF Shimming in Ultra-High-Field MRI Nan Li, Feng Du, Yurun Ouyang, Zhuoyang Lin, Wei Cao, Wenhao Liao, Peiyu He, Shang Gao, Zhiguang Mo, Yizhi Cui, Shahzeb Hayat, Xiaoliang Zhang, Yining Wang, Ye Li Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China Impact: This study presents a transform-domain modal decomposition strategy for efficient RF shimming in ultra-high-field MRI. The approach achieves superior B₁⁺ uniformity and effective SAR control across complex anatomical regions, thereby enhancing imaging performance, safety, and overall reliability.
08:32		451-01-007. Pre-optimized Universal Encoding Matrix for Robust Multi-Channel B1+ Mapping in Ultra-High Field Magnetic Resonance Imaging Yurun Ouyang, Nan Li, Feng Du, Zhuoyang Lin, Zhiguang Mo, Tongtong Chen, Xiaoliang Zhang, Yining Wang, Ye Li Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China Impact: This study presents a robust method for generating multi-channel radiofrequency excitation encoding matrices tailored to specific imaging regions. The proposed technique significantly enhances the reliability of B₁⁺ mapping, thereby enabling more precise and robust imaging at ultra-high field strengths.
08:34		451-01-008. Hybrid Precision Absolute B1+ Mapping at 7T: Experimental Comparison of Sequential and Interleaved GRE Acquisition Strategies Max Lutz, Christoph Aigner, Felix Krueger, Sebastian Schmitter Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Berlin, Germany Impact: Interleaved GRE acquisition enables accurate, bias-free hybrid B₁⁺ mapping at 7T, allowing higher flip angles and improved SNR. This work provides an experimental validation of the approach, supporting its use for robust, large-FOV B₁⁺ mapping in UHF MRI.
08:36		451-01-009. Monitoring and Correction of RF Transmission Nonlinearities in MRF-based B1+ mapping at 7T Max Lutz, Frank Seifert, Sebastian Schmitter Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Berlin, Germany Impact: This work demonstrates that MRF-based B₁⁺ mapping is highly sensitive to RF transmission imperfections. RF monitoring enables accurate correction of these effects, improving quantitative reliability and enhancing comparability of different MRF sequences across clinical and ultra-high-field systems.
08:38		451-01-010. Keeping it "balanced" in bSFFP with Universal Pulses Benoît Béranger, Marc Lapert, Franck Mauconduit, Aurélien Massire, Joseph Brégeat, Tony Stoecker, Vincent Gras, Julien Lamy Paris Brain Institute, Paris, France Impact: Universal Pulses in a bSSFP sequence at 7T allow for a calibration-free whole brain 3DT2 with homogeneous excitation. Quantitative imaging using phase cycled bSSFP acquisitions should be more robust thanks to reliable spatial flip angles.
08:40		451-01-011. A Novel Flexible Leaky-Wave Antenna Design for Uniform and Efficient RF Transmission in Ultra-High-Field MRI Haiwei Chen, Jia Liu, Shufeng Zhou, Yi Wang, Keyi Tang, Yang Gao, Richard Bowtell, Chunyi Liu University of Nottingham, Nottingham, United Kingdom Impact: This work introduces a flexible leaky-wave antenna for 7 T MRI that combines power recycling and dielectric field-shaping to achieve uniform B₁⁺ transmission and reduced SAR, enabling efficient, large-coverage body imaging with improved safety and stability at ultra-high field.
08:42		451-01-012. Numerical Comparison of Dual Row RF Arrays for Head Imaging from 7T to 14T Georgiy Solomakha, Felix Glang, Klaus Scheffler, Nikolai Avdievich Max Planck Institute for Biological Cybernetics, Tübingen, Germany Impact: Numerical simulations reveal performance trends of loop and dipole arrays from 7T to 14T, guiding coil development for next-generation UHF MRI. In particular, the findings highlight the importance of local RF shields at 14T.
08:44		451-01-013. A Head/Neck RF Array with a 6+2 Tx/Rx Meander-Microstripline Arrangement for Imaging on an 8-Channel pTx 7T MR System Markus May, Celina Kersting, Farzad Jabbarigargari, Oliver Kraff, Fabian Bräuer, Laia Sulaiman, Carolin Stevens, Titus Lanz, Harald Quick High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany Impact: The constructed 8-channel Tx/Rx head-neck coil enables large FOV head-neck UHF imaging of the whole-brain and C-spine at 7T in conjunction with a standard 8-channel pTx system.
08:46		451-01-014. An 8-channel transceiver array for pTx MRI of the knee at 7T Laia Sulaiman, Oliver Kraff, Georgiy Solomakha, Carolin Stevens, Kim Jotzo, Farzad Jabbarigargari, Fabian Bräuer, Celina Kersting, Annika Verheyen, Nikolai Avdievich, Klaus Scheffler, Harald Quick, Markus May Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany Impact: The 8-channel transceiver pTx knee array demonstrated superior transmission efficiency in head-feet direction over the vendor-provided single-channel birdcage coil. RF shimming techniques improved image contrast and homogeneity despite inferior receive performance due to limited number of receive channels.
08:48		451-01-015. Accelerated parallel transmit pulse optimization strategies for reduced-FOV Spinal Cord MRI at 7 T Charles Betemps, Vincent Gras, Joseph Brégeat, Virginie Callot, Aurelien Destruel Aix Marseille Univ, Marseille, France Impact: Accelerating GRAPE-based pTx pulse optimization enables fast, patient-specific RF design for reduced-FOV spinal cord MRI at 7T. This represents an important step toward broader applicability of rFOV pTx excitation in the spinal cord and supports future in vivo evaluation.
08:50		451-01-016. Improving Parallel Transmission Efficiency in 7T MRI Using Passive Resonators Reza Babaloo, Kyle Gilbert, Ravi Menon Robarts Research Institute - Western University, Canada Impact: This work demonstrates that integrating passive loop resonators with multi-channel head coils at 7T enhances transmit efficiency without added hardware complexity, enabling higher-quality neuroimaging and motivating new passive field-shaping approaches for safer and more efficient UHF MRI.
08:52		451-01-017. Electromagnetic Evaluation of RF Shield Designs for Ultra-High Field Transmit Arrays Jeslin Issac, Son Chu, Richard Bowtell, Shajan Gunamony University of Glasgow School of Psychology and Neuroscience, United Kingdom Impact: At ultra-high field strengths such as 10.5T and above, wave propagation in the scanner bore significantly reduces the performance of transmit arrays. We use RF shield structure to minimize radiation loss and demonstrate transmit performance at field strengths 10.5T/11.1T/11.7T.
08:54		451-01-018. Feasibility of Whole-Brain Human Diffusion MRI at 10.5T: Promises, Challenges, and Potential Solutions Alireza Sadeghi-Tarakameh, Nils Nothnagel, Christophe Lenglet, Steen Moeller, Matt Waks, Russell Lagore, Shaun Warrington, Stam Sotiropoulos, Luca Vizioli, Gregor Adriany, Kamil Ugurbil, Essa Yacoub Center for Magnetic Resonance Research (CMRR), University of Minnesota, Minneapolis, United States of America Impact: This study evaluates the feasibility and challenges of in-vivo whole-brain dMRI at 10.5T, with a focus on achieving the target resolutions for whole-brain connectivity mapping envisioned in the BRAIN2.0 initiative and the next generation of the Human Connectome Project.