ISMRM25 - Low-Field MRI

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

Low-Field MRI

Power Pitch

Physics & Engineering

Tuesday, 13 May 2025

Power Pitch Theatre 2

08:15 - 10:15

Moderators: Joseba Alonso & Jessica Martinez

Session Number: PP-20

No CME/CE Credit

08:15		Screen Number: 26 0474. A Comprehensive Educational Course with a Portable MRI Scanner - from Hardware to Map View Presentation Video J. M. Algarin, J. Pfitzer, Q. Chen, T. Guallart-Naval, B. Menkuec, M. Duarte, S. Malik, M. Zaiss, M. Uecker, J. Alonso, M. Zaitsev, J. P. Marques Institute for Instrumentation in Molecular Imaging (i3M), CSIC, Valencia, Spain Impact: This event showcased the transformative potential of in-situ scanners in MRI education, paving the way for future educational initiatives that can enhance practical skills and foster innovation in (low-field) MRI applications.
08:17		Screen Number: 27 0475. 3D Printing Integrated Design and Shimming of Sparce Halbach Permanent Magnet Array for Head-Only Portable MRI View Presentation Video M. Xu, W. M. Choo, T-O Liang, A. R, Y. Guo, S. Y. Huang National University of Singapore, Singapore, Singapore Impact: This work proposes the applications of 3D printing to shim sparse permanent magnet arrays with construction precision. It enables faster, cost-effective magnet array shimming, advancing MRI capabilities in resource-limited settings and improving global diagnostic access.
08:19		Screen Number: 28 0476. Non-CPMG Multiband FSE for Improved SNR Efficiency on a Portable Low Field System View Presentation Video P. Lee, Y. Qiu, J. Liu, F. Jiang, Z. Zhang Shanghai Jiao Tong University, Shanghai, China Impact: The application of multiband Fast Spin Echo (FSE) refocusing pulses that do not satisfy CPMG phase constraints was achieved using a quadratic phase increment scheme. Employing quadratic phase increment schemes may permit relaxation of other common FSE design constraints.
08:21		Screen Number: 29 0477. Transient shear wave elastometry using a portable magnetic resonance sensor View Presentation Video W. Selby, P. Garland, I. Mastikhin University of New Brunswick, Fredericton, Canada Impact: In this study, we demonstrate that simple, compact magnetic resonance instruments can effectively and quantitatively characterize tissue elasticity. These methods can be used with specific, purpose-built instruments that can be employed in high-impact areas as valuable tools for routine monitoring.
08:23		Screen Number: 30 0478. Ultra-Low-Field MRI Protocol Optimization for Data-Driven and AI-Driven Brain Volume Analysis View Presentation Video P. Hsu, E. Marchetto, D. Sodickson, P. Johnson, J. Veraart Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University Grossman School of Medicine, New York, United States Impact: We present an optimal ULF image acquisition protocol with a scan time of approximately 15 minutes. Deep learning ULF image enhancement methods that are trained on this optimized protocol excel in the accuracy and reliability of subsequent brain volume analyses.
08:25		Screen Number: 31 0479. An Exploration of Parallel Imaging System for Very-low Field (50mT) MRI Scanner View Presentation Video L. Yang, Y. Kang, Z. Xu, H. Han Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China Impact: We introduce, for the first time, a PI technique specifically tailored for VLF MRI scanners. This technique halves the scanning time, which could be especially beneficial for stroke patients requiring VLF MRI assessments.
08:27		Screen Number: 32 0480. Design of a local transmit RF-resonator with enhanced local B1+-field for improved abdominal imaging in a single-sided low-field system View Presentation Video K. Selvaganesan, V. Venkidu, M. Raja Viswanath, M. Shokrekhodaei, A. Reykowski, S. King Promaxo Inc., Oakland, United States Impact: Low-field, open MR systems allow for image-guided abdominal therapies but are limited by B₁+-field strength and penetration depth. The proposed local Tx RF-resonator enhances transmit efficiency and image quality, enabling deeper, more effective low-field abdominal imaging.
08:29		Screen Number: 33 0481. Polygonal Halbach Array for Low-Field Portable MRI View Presentation Video A. R, B. Blümich, S. Y. HUANG Singapore University of Technology and Design, Singapore, Singapore Impact: This study lays the groundwork for optimizing layered Halbach arrays with unexplored polygonal and hybrid shapes that achieve stronger, more homogeneous fields. A formula for versatile cross-sections enables further innovation in magnet array designs.
08:31		Screen Number: 34 0482. Propagating Segmentation Uncertainties in Ultra-Low Field Using Matched Scans and Bootstrapping View Presentation Video A. Leknes, A. Zahra, D. Scheiene, R. Macleod, C. Casella, J. Cole, J. O'Muircheartaigh, V. Nankabirwa, M. Bruchhage University of Stavanger, Stavanger, Norway Impact: Robust uncertainty estimates for brain anatomy are fundamental for investigating typical and atypical neurodevelopment. Propagating model uncertainties to volumetric estimates by comparing ULF results against gold standard high-field MRI can help guide diagnosis and assessment of brain health.
08:33		Screen Number: 35 0483. Correcting for b-value spatial non-uniformity arising from B0-inhomogeneity in an ultra-low field system View Presentation Video J. Gholam, J. Ametepe, M. Cercignani, F. Padormo, D. Jones CUBRIC, School of Psychology, Cardiff University, Cardiff, United Kingdom Impact: This work demonstrates that diffusion estimates in inhomogeneous static fields with weak encoding gradients are likely to be significantly skewed by that inhomogeneity. We demonstrate a simple fieldmap correction that does not require downstream retooling and induces minimal noise enhancement.
08:35		Screen Number: 36 0484. Enhancing B0 Homogeneity in Low-Field MRI: Experimental Study on the Thermal Dependence of Halbach Permanent Magnets View Presentation Video P. Povolni, K. Buckenmaier, S. Maltsev, K. Scheffler Max Planck Institute for Biological Cybernetics, Tuebingen, Germany Impact: Dynamic temperature-dependent B₀-drift of permanent magnet-based low-field MRI represents a significant challenge, especially with bSSFP sequences. Our experimental study, complemented by the construction of a prototype, demonstrates a solution to this problem through active water cooling of the magnets themselves.
08:37		Screen Number: 37 0485. Low-cost and Compact eGaN Gradient Power Amplifier Operation at High Frequency: Reduced Noise Switch-mode Power Conversion View Presentation Video N. Bolding, C. Vaughn, A. Patel, S. Lin, J. Sun, W. Grissom, M. Griswold Case Western Reserve University, Cleveland, United States Impact: This gradient amplifier for low-field MRI employs a eGaN-transistor-based design to shrink size and cost while suppressing noise by switching at an optimized frequency, near to but not the Larmor frequency. These improvements will help improve MRI accessibility and mobility.
08:39		Screen Number: 38 0486. A Single-Sided 50mT, 7kg “Helmet” Magnet for Continuous Brain Monitoring in Acute-Care Setting View Presentation Video S. Chen, S. Altman, J. Stockmann, C. Cooley, L. Wald Massachusetts Institute of Technology, Cambridge, United States Impact: We present a portable, single-sided 50mT B0 magnet with improved field coverage and a built-in 50mT/m gradient for readout, advancing the development of an MRI system capable of continuous brain imaging in acute-care settings.
08:41		Screen Number: 39 0487. Lightweight and assembly-friendly single-sided permanent magnet array design based on Inward-outward (IO) ring units View Presentation Video J. YANG, R. Qin, Y. Jiang, Z. Zhou, A. R, S. Y. Huang, W. Yu Chiba University, Chiba, Japan Impact: A novel, open, single-sided magnet array with 65mm imaging depth was designed through a design approach that breaks the limitations of traditional methods and optimize magnet configurations using different types of IO ring units.
08:43		Screen Number: 40 0488. Abdominal T1 and T2 mapping at 0.05 Tesla View Presentation Video X. Lin, Y. Ding, S. Su, A. Leong, Y. Zhao, E. Wu The University of Hong Kong, Hong Kong SAR, China Impact: The research aims to measure the relaxation properties of liver, muscle, kidney, spleen and spinal bone marrow. These measurements provide valuable information for the design and optimization of MRI sequences to achieve desired image contrast.
08:45		Screen Number: 41 0489. Evaluating repeatability of in vivo imaging in multiple locations using a portable Halbach-based 46 mT scanner View Presentation Video C. Najac, R. van den Broek, T. O'Reilly, A. Webb, B. Lena C.J. Gorter MRI Center, Radiology, Leiden University Medical Center, Leiden, Netherlands Impact: We examined the stability of our 46mT point-of-care MRI scanner by scanning healthy volunteers multiple times in a controlled lab settings and new locations (ICU and van). Findings showed minimal scan-to-scan variation and little differences across locations.
08:47		Screen Number: 42 0490. How close are we to the theoretical maximum SNR in portable low field MRI? View Presentation Video C. Najac, A. Webb C.J. Gorter MRI Center, Leiden, Netherlands Impact: A framework has been established to estimate the signal-to-noise ratio obtainable on any given design of point-of-care low field imaging system.
08:49		Screen Number: 43 0491. A Feasibility Study of Task-Based fMRI at 0.55 T View Presentation Video P. Razmara, T. Medani, A. A. Joshi, M. Abbasi Sisara, Y. Tian, S. X. Cui, J. P. Haldar, K. S. Nayak, R. M. Leahy University of Southern California, Los Angeles, United States Impact: This study demonstrates that reliable task-based fMRI is feasible on 0.55T scanners, potentially broadening functional neuroimaging access in clinical and research settings where high-field MRI is unavailable or impractical, supporting broader diagnostic and research applications.
08:51		Screen Number: 44 0492. Toroid-inspired RF Volume Coils for Enhanced Transmit Efficiency at Ultra-Low Field 47mT MRI: A Comparison with Solenoid Coils View Presentation Video J. Vliem, I. Zivkovic Eindhoven University of Technology, Eindhoven, Netherlands Impact: This work suggests that toroid-inspired RF coils may offer a more efficient and homogeneous transmit field at ultra-low field MRI, supporting the development of affordable, high-quality imaging systems.
08:53		Screen Number: 45 0493. A fast eddy currents correction method based on field probe in portable low-field MRI View Presentation Video S. Chen, Y. Qiu, P. Lee, S. Yang, H. Chen, Z. Zhang School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China Impact: Eddy currents in a samarium cobalt two-plate permanent magnet portable design can be reliably characterized in 5 minutes, which can be used to minimize impacts of field inhomogeneity, instability, and remanence, as well as improving clinical image quality (e.g., DWI).
08:55		Screen Number: 46 0494. Progress towards a dedicated 136 mT Portable MRI Scanner for Brain Imaging in the Neonatal ICU View Presentation Video M. Sliwiak, A. Purchase, S. Altman, J. Short, M. David, V. Klein, J. Stockmann, L. Wald, C. Cooley Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, United States Impact: The 136 mT bedside NICU MRI scanner addresses the high risks associated with transporting fragile neonates to conventional MRI facilities, offering safe, on-site brain imaging in the NICU. This could enable faster diagnosis and earlier interventions, potentially improving clinical outcomes.
08:57		Screen Number: 47 0495. DC Coil Arrays for Gradient Field Generation and Static Field Correction at Ultra-Low Field (54 mT) MRI View Presentation Video M. van Dijk, J. Vliem, L. Budé, G. Radulov, I. Zivkovic Eindhoven University of Technology, Eindhoven, Netherlands Impact: This work demonstrates the feasibility of a simplified DC coil structure to replace conventional gradient coils and introduces an effective approach for static field homogenization in ultra-low field MRI (54 mT).
08:59		Screen Number: 48 0496. Accelerated B0 Mapping and Distortion Correction in Ultra-Low Field MRI Using Locally Low-Rank Reconstruction View Presentation Video Y. Dong, T. O’Reilly, C. Najac, A. Webb, B. Lena C.J. Gorter MRI Center, Department of Radiology, LUMC, Leiden, Netherlands Impact: This approach enables faster, distortion-corrected imaging for low-field MRI in varied settings, expanding its potential for accessible, portable medical imaging in remote and resource-limited environments.
09:01		Screen Number: 49 0497. Standardized Phantom for Consistent Brain Imaging Protocols for a Low-Field MRI (48mT) System in LMICs View Presentation Video P. Tusiime, R. Amodoi, M. Williams, R. Asiimwe, M. A. Nassejje, L. Lemi, O. Johnes Mbarara University of Science and Technology, MBARARA, Uganda Impact: The developed phantom enhances accessibility and improves calibration consistency reducing lengthy scan preparation times. It promotes local resource utilization & collaborative research initiatives to advance healthcare technology in LMICS.
09:03		Screen Number: 50 0498. An inherently decoupled three-element solenoidal array coil for accelerated imaging on a 46 mT Halbach-based permanent magnet system. View Presentation Video J. Parsa, B. Lena, Y. Dong, A. Webb Leiden University Medical Center , Leiden, Netherlands Impact: This method of decoupling can make the application of solenoidal phase array possible for wrist imaging accelerate by factor 3 which is very important in point of care MRI systems.

Similar Session(s)