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Related Concept Videos

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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Updated: May 24, 2025

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Biplanar nulling coil system for OPM-MEG using printed circuit boards.

Mainak Jas1,2, John Kamataris1, Teppei Matsubara1,2

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, USA.

Biorxiv : the Preprint Server for Biology
|March 3, 2025
PubMed
Summary
This summary is machine-generated.

New, affordable printed circuit board (PCB) coils effectively cancel background magnetic fields, enabling optically pumped magnetometers (OPMs) for magnetoencephalography (MEG) in less shielded environments. This advances accessible neuroscience research.

Keywords:
field nullingmagnetoencephalographyoptically pumped magnetometerprinted circuit boardssomatosensory evoked field

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Area of Science:

  • Biophysics
  • Neuroscience
  • Sensor Technology

Background:

  • Optically pumped magnetometers (OPMs) offer sensitive, non-invasive measurement of human electrophysiological signals like magnetoencephalography (MEG).
  • OPMs require near-zero background magnetic fields for accurate, undistorted measurements.
  • Conventional biplanar field nulling coils are costly and difficult to manufacture.

Purpose of the Study:

  • To design and fabricate affordable, easily manufactured background magnetic field nulling coils for OPM-based MEG.
  • To demonstrate the effectiveness of these coils in reducing background magnetic fields.
  • To enable OPM-MEG operation in less stringent magnetic shielding conditions.

Main Methods:

  • Designed two-layer Printed Circuit Board (PCB) coils using open-source bfieldtools software to null uniform and gradient magnetic fields.
  • Developed a software-based method to create continuous current paths across PCB layers.
  • Fabricated coils in two halves for easier manufacturing and assembly.

Main Results:

  • Achieved field nulling coil efficiency comparable to or higher than previous methods (1.3 - 7.1 nT/mA).
  • Reduced the largest background magnetic field component from 21 nT to 2 nT within a 50-cm spherical volume.
  • Successfully recorded somatosensory evoked fields (SEFs) using OPMs in a lightly shielded room, yielding results comparable to SQUID-based MEG in a heavily shielded room.

Conclusions:

  • Developed a cost-effective and manufacturable solution for background magnetic field nulling coils using PCBs.
  • Demonstrated the feasibility of OPM-MEG in less shielded environments, broadening accessibility.
  • Disseminated the design and software as an open-source package (opmcoils) to promote OPM-MEG adoption.