Cape Town - 2026 ISMRM-ISMRT Annual Meeting and Exhibition
9 May 2026 – 14 May 2026 · Cape Town, South Africa
506-01-005 ISMRM Abstract

External Passive Shimming of a 135 mT Halbach Magnet for a Bedside NICU MRI Scanner; A Flexible, Space-Saving Approach

Primary: Physics & Engineering - Low-Field MRI
Secondary: Pediatrics - Neonatal
506-01-005 · Low Field MRI Hardware · Wednesday, 13 May, 8:20 AM–10:10 AM · Auditorium 2
Keywords: B0 shimming Permanent Magnets Array Neonatal brain imaging Low-Field Portable
Accepted
Sarah E Altman 1,2, Monika Śliwiak2,3, Dinank Gupta4, Zi Xiong2, Jeff Short2, Susanna Chen2, Koos Zevenhoven2,5, Gabriel Zihlmann6, Sara Bates7, Camilo Jaimes8,9, Jason Stockmann2,10, Lawrence L Wald2,10,11, Clarissa Z Cooley2,10
1Harvard-MIT Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, United States of America
2Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, United States of America
3Commonwealth Fusion Systems, Cambridge, United States of America
4Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, United States of America
5Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland
6Center for Adaptable MRI Technology (AMT Center), Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, United Kingdom
7Department of Neonatology, Massachusetts General Hospital and Harvard Medical School, Boston, United States of America
8Department of Radiology, Harvard Medical School, Boston, United States of America
9Pediatric Imaging Research Center, Massachusetts General Hospital, United States of America
10Harvard Medical School, Boston, United States of America
11Harvard-MIT Health Sciences and Technology, Cambridge, United States of America
Presenting Author: Sarah E Altman

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References

1. Hyperfine, Inc. and the Swoop® Portable MR Imaging® System. http://www.hyperfine.io/.
2. Purchase, A. et al. Concept 0.13 T bedside MRI for early brain imaging in the neonatal intensive care unit. in 0908 (Singapore). doi:10.58530/2024/0908. [doi]
3. Śliwiak, M. et al. Progress towards a dedicated 136 mT Portable MRI Scanner for Brain Imaging in the Neonatal ICU. in 0494 (Honolulu, Hawaii, USA). doi:10.58530/2025/0494. [doi]
4. Śliwiak, M. et al. Progress Towards a 136 mT Portable MRI for Neuropathological Assessment in Preterm Neonates. in 5425 (Honolulu, Hawaii, USA). doi:10.58530/2025/5425. [doi]
5. Cooley, C. Z. et al. A portable scanner for brain MRI. Nat. Biomed. Eng. 5, 229–239 (2021).
6. Cooley, C. Z. et al. Two-dimensional imaging in a lightweight portable MRI scanner without gradient coils. Magn. Reson. Med. 73, 872–883 (2015).
7. Block, K. T. et al. MRI4ALL: A Week-Long Hackathon for the Development of an Open-Source Ultra-Low-Field MRI System. J. Magn. Reson. Imaging JMRI 62, 959–968 (2025).
8. O’Reilly, T., Teeuwisse, W. M., de Gans, D., Koolstra, K. & Webb, A. G. In vivo 3D brain and extremity MRI at 50 mT using a permanent magnet Halbach array. Magn. Reson. Med. 85, 495–505 (2021).
9. Wenzel, K. et al. B0-Shimming Methodology for Affordable and Compact Low-Field Magnetic Resonance Imaging Magnets. Front. Phys. 9, (2021).
10. Ortner, M. & Coliado Bandeira, L. G. Magpylib: A free Python package for magnetic field computation. SoftwareX 11, 100466 (2020).
11. Blank, J. & Deb, K. pymoo: Multi-objective Optimization in Python. IEEE Access 8, 89497–89509 (2020).
12. Opera. Dassault Systèmes https://www.3ds.com/products/simulia/opera (2023).
13. Cooley, C. Z. et al. Design and implementation of a low-cost, tabletop MRI scanner for education and research prototyping. J. Magn. Reson. 310, 106625 (2020).

Cite this abstract

http://echo.ismrm.org/p/ISMRM2026/506-01-005