ISMRM25 - RF Heavy

ISMRM & ISMRT Annual Meeting & Exhibition • 10-15 May 2025 • Honolulu, Hawai'i

RF Heavy

Traditional Poster

Tuesday, 13 May 2025

Building: Room: Exhibition Hall

09:15 - 10:15

Session Number: T-29

No CME/CE Credit

		4988. Magnetic Particle Imaging angiography in a human cadaveric perfusion model PDF Poster P. Vogel, M. Rückert, J. Günther, T. Reichl, T. Kampf, P. Gruschwitz, A. M. Augustin, J-P Grunz, F. Kleefeldt, D. Peter, S. Ergün, T. Bley, V. Behr, S. Herz, V. Hartung University of Würzburg, Würzburg, Germany Impact: MPI offers a radiation-free alternative for real-time vascular imaging, improving patient safety, especially in sensitive populations. With its high-resolution, dynamic imaging capabilities the integration into clinical settings could reduce/remove ionizing radiation and associated risks in interventional radiology.
		4989. Neither loop nor dipole – mirrored box antenna as a candidate for pattern reconfigurable transmit and/or receive coil for imaging at (9.4T) UHF MRI PDF Poster J. Vliem, L. Budé, I. Zivkovic Technical University of Eindhoven, Eindhoven, Netherlands Impact: Proposed antenna design can be used as transcieve element alone or in time interleaved fashion for efficient brain imaging at UHF. Obtained spatial diversity can be employed in receive configuration for SNR enhancement by minimizing the g-factor.
		4990. Quality factor measurement and enhancement techniques for ultra-high field surface loop receiver coils PDF Poster R. Lagore, A. Sadeghi-Tarakameh, M. Waks, K. Ugurbil, G. Adriany University of Minnesota, Minneapolis, United States Impact: Bench measurements and simulation results of Q-ratio and SNR fraction vs coil size shared herein provide a useful guide to coil builders in understanding potential sources of SNR losses and estimating those losses in ultra-high field RF coil development.
		4991. Coil evaluation for abdominal imaging of hyperpolarized 13C-pyruvate PDF Poster M. McLean, J. Birchall, I. Horvat-Menih, J. Kaggie, T. Lanz, A. Morris, F. Robb, M. Wylot, A. Grimmer, E. Latimer, M. Zamora-Morales, M. Graves, F. Gallagher University of Cambridge, Cambridge, United Kingdom Impact: This body multi-channel array setup enables ¹³C studies of diseases which may otherwise not be evaluable with clamshell coils. For example, ovarian cancer is widely disseminated through the abdomen and obesity is a strong risk factor.
		4992. A Novel Self-Tuned and Self-Decoupled Wireless Prostate Array for Enhanced Imaging Resolution and SNR at 3T MRI PDF Poster S. Hayat, E. Xiao, W. Liao, Z. Mo, F. Du, N. Li, Q. Chen, X. Zhang, Y. Li Lauterbur Imaging Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China Impact: The proposed 5-channel wireless array offers a compact, self-decoupled, and efficient design that enhances SNR and field uniformity for prostate imaging, improving diagnostic accuracy and patient outcomes while addressing limitations of current coils.
		4993. A Flexible Multinuclear RF Frequency Extension for a Low-Cost, Accessible Spectrometer PDF Poster C. Bauer, B. Malone, J. Ruff, J. Hou, S. Wright Texas A&M University, College Station, United States Impact: This spectrometer aims to advance multinuclear magnetic resonance research by employing direct waveform generation and sampling to simplify architecture. Its low-cost, open-source design offers accessible tools for researchers exploring innovative approaches in multinuclear spectroscopy and imaging.
		4994. Passive RF and Active DC (PRAD) Coil for Enhancing Local SNR and Correcting B0 Inhomogeneity in MRI PDF Poster M. Lu, X. Chang, X. Yan Vanderbilt University medical center, Nashville, United States Impact: This versatile coil design provides a practical method for improving MRI image quality without extensive hardware modifications, potentially enhancing diagnostic capabilities.
		4995. Towards Optimization of SNR at Both Frequencies of an UHF Double-Tuned Array: 7T 32-Element Transceiver 31P/1H Loop/Dipole Human Head Array. PDF Poster N. Avdievich, G. Solomakha, F. Glang, T. Platt, S. Orzada, D. Bosch, M. Ladd, A. Korzowski, K. Scheffler Max Planck Institute for Biological Cybernetics, Tübingen, Germany Impact: We demonstrated the feasibility of constructing and decoupling of a densely-populated 32-element double-tuned transceiver 7T human head array. First results show reasonable transmit and receive performance at both frequencies. The developed design can be even more beneficial at higher fields.
		4996. Design Considerations Towards Size-Adaptive pTx Arrays for 7T Brain Imaging PDF Poster A. Ghotra, S-L Hansen, Y. Aksu, M. Mahmutovic, M. Shrestha, B. Keil TH Mittelhessen University of Applied Sciences, Gießen, Germany Impact: The novel 16-channel size-adaptive transceiver array for 7T enhances transmission efficiency with maintaining consistent SAR performance. Its four-segment design, featuring three adjustable segments (two lateral and one anterior), ensures precise head size customization with superior parallel imaging and safety.
		4997. Understanding RF Coil Coupling in MRI Arrays: Insights from S11 and Z11 Analysis PDF Poster M. Mahmutovic, M. Shrestha, S-L J. Hansen, A. Ghotra, M. Poniatowski, B. Keil Institute of Medical Physics and Radiation Protection, TH Mittelhessen University of Applied Sciences, Giessen, Germany Impact: This study provides a deeper understanding of coupling effects, offering a practical tool for diagnosing decoupling issues in high-density array coils. These insights could streamline coil designs, ultimately improving MRI image quality.
		4998. Design and construction of a 16-channel receive-only array for high resolution MRI of marmosets’ brain at 9.4 T. PDF Poster D. Papoti, B. Zhang, D. Szczupak, D. Schaeffer, A. Silva University of Pittsburgh, Pittsburgh, United States Impact: Higher SNR anatomical images may decode new features for the longitudinal evaluation of different stages of Alzheimer’s disease progression.
		4999. A double-layer 1H/23Na transceiver array for human brain imaging at 7T PDF Poster F. Lou, C. Duan, Z. Quan, J. Qu, C. Guo, A. Nagel, X. Lou, X. Zhang School of Medicine, Zhejiang University, Hangzhou, China Impact: This coil design provides an integrated solution for 23Na and clinically acceptable 1H structural imaging. Without the necessity to change coils, it could significantly reduce unnecessary scanning procedures and eliminate the need for image registration.
		5000. Low-Cost, Low-Power Gradient Amplifier for MRI Array Coils Using Modified Audio Class-D Amplifiers and Custom Analog Feedback PDF Poster M. Takrimi, M. C. Işık, F. G. Uyar, M. E. Öztürk, M. Ghasemzadeh, E. Aydın, E. Atalar Bilkent University, Ankara, Turkey Impact: Gradient array coils offer tunable magnetic field profiles and adjustable ROIs but require multiple power amplifiers. This work demonstrates an affordable (<90$) solution using commercially available Class-D audio amplifiers combined with tunable analog feedback system to feed multi-channel gradient arrays.
		5001. A Scalable Digital Distributed Console for Simulcast X-nuclei MRI PDF Poster Z. Zhang, L. Chen, X. Cheng, J. Wang, Q. Bao, K. Wang, X. Sun, F. Chen, C. Liu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China Impact: The Simulcast-X MRI study has been successfully implemented by our developed console on a 3T MRI platform. The potential of this technology lies in reducing scan time in multinuclear MRI, offering opportunities to investigate the complex interactions among different nuclei.
		5002. A 9-channel 1H, 3-channel 31P RF coil for metabolic calf muscle studies at 7 T PDF Poster V. Cap, M. Meyerspeer, V. dos Santos, O. Soanca, E. Laistler, R. Frass-Kriegl Medical University of Vienna, Vienna, Austria Impact: The developed coil will enable advanced metabolic calf muscle studies, as it combines excellent ¹H performance with the possibility of acquiring high-quality ³¹P spectra. Combining dipoles and loops is a powerful approach for building high-density coil arrays at ultra-high field.
		5003. External RF Mixer for Platform-Independent Motion Sensing with Beat Pilot Tone PDF Poster J. Kang, S. Anand, M. Lustig University of California, Berkeley, Berkeley, United States Impact: Our hardware augmentation removes dependence on platform-specific nonlinearities by externalizing the BPT intermodulation process to a well-characterized device. This allows BPT, a novel and effective motion detection scheme, to be widely applied across scanner platforms.
		5004. A multi-octave GaN HEMT radio frequency power amplifier with high efficiency and high linearity for 5T multinuclear MRI PDF Poster S. Gao, X. Yang, J. Wang, X. Rong, S. Hayat, G. Yang, P. He, X. Zhang, H. Zheng, Y. Li Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, shenzhen, China Impact: GaN RFPA with higher bandwidth, linearity and efficiency can be applied to high-field multinuclear MRI transmitting systems with different field strengths, which brings improvements for scanning sequences with long pulse widths and high linearity requirements.
		5005. Optimized z-Direction RF Coil for Multiphoton Excitation with Improved Homogeneity PDF Poster H. Kempfert, V. Han, T. Ipek, C. Liu University of California, Berkeley, Berkeley, United States Impact: Our numerically optimized z-directed transmit coil provides improved spatial homogeneity and field strength for multiphoton MRI applications. This advancement supports our future experimental requirements as we further explore the applications of multiphoton MRI.
		5006. RF shimming methods for optimizing B1+ homogeneity and SAR reduction for a high channel density transmit array at 7T PDF Poster A. Sajewski, J. Li, T. Santini, T. Campos, L. Wang, T. Ibrahim University of Pittsburgh, Pittsburgh, United States Impact: Multi-ROI RF shimming using histogram loss is successful at optimizing B₁⁺ throughout the brain. By performing B₁⁺-restrictive RF shimming with SAR-heavy cost functions, the electromagnetic fields of a multichannel transmit array are manipulated to maintain B₁⁺ conditions while reducing SAR.
		5007. Enhancing B₁⁺ Field Homogeneity in 7T MRI Using Metasurfaces: Balancing Image Quality and Safety PDF Poster P. Narvekar, P. Jacobs, R. Reddy University of Pennsylvania , Philadelphia, United States Impact: This study's findings could lead to improved MRI diagnostics. It opens new avenues for investigating metasurface optimization and safety protocols, ultimately advancing high-field MRI applications and patient outcomes in neuroimaging.

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