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The tale of two rooms: comparison of zero-field QuSpin OPM's operation in the two magnetically shielded environments
  • +6
  • Ekaterina Skidchenko,
  • Anna Butorina,
  • Nikita Fedosov,
  • Oleg Shevtsov,
  • Daria Medvedeva,
  • Zhao Darisy,
  • Dubynin Ignat,
  • Nikolay Koshev,
  • Alexei Ossadtchi
Ekaterina Skidchenko
Skolkovo Institute Of Science And Technology

Corresponding Author:[email protected]

Author Profile
Anna Butorina
Skolkovo Institute Of Science And Technology
Nikita Fedosov
Centre for Bioelectric Interfaces Higher School of Economics
Oleg Shevtsov
LLC "Life Improvement by Future Technologies Center", Centre for Bioelectric Interfaces Higher School of Economics
Daria Medvedeva
LLC "Life Improvement by Future Technologies Center", Centre for Bioelectric Interfaces Higher School of Economics
Zhao Darisy
The National Research Centre Kurchatov Institute, Moscow State University of Psychology and Education (MEG Center)
Dubynin Ignat
Moscow State University of Psychology and Education (MEG Center)
Nikolay Koshev
LLC "Life Improvement by Future Technologies Center", Skolkovo Institute Of Science And Technology
Alexei Ossadtchi
LLC "Life Improvement by Future Technologies Center", Centre for Bioelectric Interfaces Higher School of Economics

Abstract

Nowadays, optically pumped magnetometers (OPMs) are gaining popularity in magnetoencephalography (MEG). However, like all sensors that work with biomagnetic signals, they are highly demanding to a low level of external magnetic field in the experimental environment. In the current paper, we proposed the experimental comparison of OPMs signal quality by recording their signal in two different magnetically-shielded rooms (MSRs) with different types of active suppression. Firstly, we conducted experiments in MSR in absence of additional local active shielding (only with one embedded into the walls). Next, we built the adaptive system of active suppression (ASAS), lightweight and portable, in another MSR and tested OPMs there. For this purpose we used sensors of two generations (Gen-1 and Gen-3) of commercial OPMs manufactured by QuSpin Inc. and tested them with standard signals generated by phantom and test coil. The results showed that MSR with installed ASAS in it enable OPMs to work optimally and give reliable results, while OPMs tested in the MSR containing SQUID system and active shielding embedded into the MSR walls, show unstable signal with low reproducibility. This study will undoubtedly facilitate research groups in building their own OP-MEG systems and understand the nature of false sensor deterioration.
31 May 2024Submitted to TechRxiv
07 Jun 2024Published in TechRxiv