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Peer-reviewedCC BYCommunications engineering

An integrated NMR field probe using rapid non-adiabatic field switch-off for (ultra) low field MRI.

  • Pavel Povolni1
  • Dominique Goerner2,3
  • Praveen Iyyappan Valsala2,4
  • Lukas Gebert3
  • Georgiy Solomakha2
  • Nicolas Kempf2
  • Felix Glang2,5
  • Judith Samlow2,6
  • Ruben Schnitzler3
  • Ingmar Kallfass3
  • Kai Buckenmaier7
  • Klaus Scheffler2,4
7 affiliations
  1. 1High‑Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany. [email protected].
  2. 2High‑Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.
  3. 3Institute of Robust Power Semiconductor Systems ILH, University of Stuttgart, Stuttgart, Germany.
  4. 4Department for Biomedical Magnetic Resonance, University of Tübingen, Tübingen, Germany.
  5. 5Institute of Biomedical Imaging, Graz University of Technology, Graz, Austria.
  6. 6Hospital Diospi Suyana, Curahuasi, Apurímac, Peru.
  7. 7High‑Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany. [email protected].
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Abstract

Access to magnetic resonance imaging (MRI) remains severely limited in low- and middle-income countries, especially in sub-Saharan Africa, despite rising rates of non-communicable diseases. Low-field MRI presents an affordable, locally developable diagnostic solution, but its performance is constrained by magnetic field instability. We present a novel NMR field probe designed to overcome these challenges using a rapid non-adiabatic switch-off of a pre-polarization field resulting in precessing spin magnetization. Achieved by first use of high-voltage silicon carbide transistors operating in controlled avalanche breakdown, it measures the Larmor frequency without prior field knowledge, unlike conventional probes. This capability is crucial during magnet development with often unknown fields, allowing early detection of magnet issues, and offering an urgently needed tool for magnet design and image-quality improvement. Validated from 1 mT to 45 mT, up to 1,000 times stronger than similar systems, its low-cost, modular design supports replication, upgrades, and enhanced field control, helping expand global MRI access.

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Cite

BibTeXRIS
BibTeX
@article{povolni2026integrated,
  title = {{An integrated NMR field probe using rapid non-adiabatic field switch-off for (ultra) low field MRI.}},
  author = {Pavel Povolni and Dominique Goerner and Praveen Iyyappan Valsala and Lukas Gebert and Georgiy Solomakha and Nicolas Kempf and Felix Glang and Judith Samlow and Ruben Schnitzler and Ingmar Kallfass and Kai Buckenmaier and Klaus Scheffler},
  journal = {Communications engineering},
  year = {2026},
  month = oct,
  doi = {10.1038/s44172-026-00815-0},
  url = {https://europepmc.org/article/MED/42957833},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - An integrated NMR field probe using rapid non-adiabatic field switch-off for (ultra) low field MRI.
AU  - Pavel Povolni
AU  - Dominique Goerner
AU  - Praveen Iyyappan Valsala
AU  - Lukas Gebert
AU  - Georgiy Solomakha
AU  - Nicolas Kempf
AU  - Felix Glang
AU  - Judith Samlow
AU  - Ruben Schnitzler
AU  - Ingmar Kallfass
AU  - Kai Buckenmaier
AU  - Klaus Scheffler
PY  - 2026
DA  - 2026/10/28
JO  - Communications engineering
DO  - 10.1038/s44172-026-00815-0
UR  - https://europepmc.org/article/MED/42957833
AB  - Access to magnetic resonance imaging (MRI) remains severely limited in low- and middle-income countries, especially in sub-Saharan Africa, despite rising rates of non-communicable diseases. Low-field MRI presents an affordable, locally developable diagnostic solution, but its performance is constrained by magnetic field instability. We present a novel NMR field probe designed to overcome these challenges using a rapid non-adiabatic switch-off of a pre-polarization field resulting in precessing spin magnetization. Achieved by first use of high-voltage silicon carbide transistors operating in controlled avalanche breakdown, it measures the Larmor frequency without prior field knowledge, unlike conventional probes. This capability is crucial during magnet development with often unknown fields, allowing early detection of magnet issues, and offering an urgently needed tool for magnet design and image-quality improvement. Validated from 1 mT to 45 mT, up to 1,000 times stronger than similar systems, its low-cost, modular design supports replication, upgrades, and enhanced field control, helping expand global MRI access.
SN  - 2731-3395
ER  -