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Biplanar Nulling Coil System for OPM-MEG Using Printed Circuit Boards.

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Summary
This summary is machine-generated.

We developed affordable, open-source printed circuit board coils for optically pumped magnetometers (OPMs) used in magnetoencephalography (MEG). This innovation makes OPM-MEG more accessible for human neuroscience research.

Keywords:
field nullingmagnetoencephalographyoptically pumped magnetometerprinted circuit boardssomatosensory evoked field

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Area of Science:

  • Biophysics
  • Neuroscience
  • Electrical Engineering

Background:

  • Optically pumped magnetometers (OPMs) are a promising technology for magnetoencephalography (MEG).
  • Previous OPM systems required expensive, manually wound background field-nulling coils.
  • These coils were difficult to produce and prone to errors.

Purpose of the Study:

  • To develop a precise, reproducible, and cost-effective manufacturing process for biplanar background field-nulling coils for OPM-MEG.
  • To enable OPM-MEG systems to operate effectively in lightly shielded rooms.

Main Methods:

  • Fabricated biplanar nulling coils on two-layer printed circuit boards (PCBs).
  • Utilized open-source software (bfieldtools) to optimize current loops and create a continuous conducting path across PCB layers.
  • Assembled coils from pairs of PCBs and mounted them on an aluminum frame.

Main Results:

  • Achieved coil efficiencies of 1.3-7.1 nT/mA, comparable or superior to previous designs.
  • Reduced the largest background magnetic field component from 21 nT to 2 nT.
  • Recorded somatosensory evoked fields (SEFs) with OPMs in a lightly shielded room, achieving results comparable to SQUID-MEG.

Conclusions:

  • The developed PCB coil system offers a cheaper, open-source alternative to commercial coils.
  • This facilitates more affordable background field nulling for OPM-MEG.
  • The technology enhances the accessibility of OPM-MEG for human neuroscience research.