Compensation System for Biomagnetic Measurements with Optically Pumped Magnetometers inside a Magnetically Shielded Room

Anna Jodko-Władzińska , Krzysztof Wildner , Tadeusz Pałko , Michał Władziński

Abstract

Magnetography with superconducting quantum interference device (SQUID) sensor arrays is a well-established technique for measuring subtle magnetic fields generated by physiological phenomena in the human body. Unfortunately, the SQUID-based systems have some limitations related to the need to cool them down with liquid helium. The room-temperature alternatives for SQUIDs are optically pumped magnetometers (OPM) operating in spin exchange relaxation-free (SERF) regime, which require a very low ambient magnetic field. The most common two-layer magnetically shielded rooms (MSR) with residual magnetic field of 50 nT may not be sufficiently magnetically attenuated and additional compensation of external magnetic field is required. A cost-efficient compensation system based on square Helmholtz coils was designed and successfully used for preliminary measurements with commercially available zero-field OPM. The presented setup can reduce the static ambient magnetic field inside a magnetically shielded room, which improves the usability of OPMs by providing a proper environment for them to operate, independent of initial conditions in MSR.
Author Anna Jodko-Władzińska (FM / IMBE)
Anna Jodko-Władzińska,,
- The Institute of Metrology and Biomedical Engineering
, Krzysztof Wildner (FM / IMBE)
Krzysztof Wildner,,
- The Institute of Metrology and Biomedical Engineering
, Tadeusz Pałko (FM / IMBE)
Tadeusz Pałko,,
- The Institute of Metrology and Biomedical Engineering
, Michał Władziński (FM / IMBE)
Michał Władziński,,
- The Institute of Metrology and Biomedical Engineering
Journal seriesSensors, [SENSORS-BASEL], ISSN 1424-8220, e-ISSN 1424-3210
Issue year2020
Vol20
No16
Pages1-14
Publication size in sheets0.65
Article number4563
Keywords in Englishoptically pumped magnetometer, magnetically shielded room, Helmholtz coils, biomagnetism
ASJC Classification1303 Biochemistry; 1602 Analytical Chemistry; 2208 Electrical and Electronic Engineering; 3107 Atomic and Molecular Physics, and Optics
DOIDOI:10.3390/s20164563
URL https://www.mdpi.com/1424-8220/20/16/4563
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); after publication
File
WUT0350481ea06e46fab2de130dbd686d03.pdf 3.88 MB
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 02-09-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.393; WoS Impact Factor: 2018 = 3.031 (2) - 2018=3.302 (5)
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