dorsal/arxiv
View SchemaOvercoming the limitations of NMR Field Probes: A Novel Integrated Sensor Utilizing Pre-Polarization for (Ultra) Low Field MRI
| Authors | Pavel Povolni, Dominique Goerner, Praveen Iyyappan Valsala, Lukas Gebert, Georgiy Solomakha, Nicolas Kempf, Felix Glang, Judith Samlow, Ruben Schnitzler, Ingmar Kallfass, Kai Buckenmaier, Klaus Scheffler |
|---|---|
| Categories | |
| ArXiv ID | 2601.07458vv1 |
| URL | https://arxiv.org/abs/2601.07458 |
| License | http://creativecommons.org/licenses/by/4.0/ |
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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"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.",
"arxiv_id": "2601.07458",
"authors": [
"Pavel Povolni",
"Dominique Goerner",
"Praveen Iyyappan Valsala",
"Lukas Gebert",
"Georgiy Solomakha",
"Nicolas Kempf",
"Felix Glang",
"Judith Samlow",
"Ruben Schnitzler",
"Ingmar Kallfass",
"Kai Buckenmaier",
"Klaus Scheffler"
],
"categories": [
"physics.med-ph"
],
"license": "http://creativecommons.org/licenses/by/4.0/",
"title": "Overcoming the limitations of NMR Field Probes: A Novel Integrated Sensor Utilizing Pre-Polarization for (Ultra) Low Field MRI",
"url": "https://arxiv.org/abs/2601.07458",
"version": "v1"
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