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A lightweight magnetically shielded room with active shielding.

Niall Holmes1, Molly Rea2, James Chalmers3

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This summary is machine-generated.

New magnetically shielded rooms (MSRs) and window coil systems offer lighter, smaller, and more affordable shielding for optically pumped magnetometer-magnetoencephalography (OPM-MEG) brain imaging systems.

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Area of Science:

  • Biophysics
  • Neuroscience
  • Materials Science

Background:

  • Magnetically shielded rooms (MSRs) are crucial for high-precision magnetic field measurements like magnetoencephalography (MEG).
  • Optically pumped magnetometers (OPMs) enable wearable MEG systems, promising high spatiotemporal resolution and motion tolerance.
  • Current MSRs for OPM-MEG are bulky, costly, and have challenging siting requirements, limiting widespread adoption.

Purpose of the Study:

  • To develop a lightweight and compact MSR design for OPM-MEG.
  • To create an effective active shielding system to minimize remnant magnetic fields within the MSR.
  • To reduce the cost and installation complexity of MSRs for broader OPM-MEG deployment.

Main Methods:

  • Designed a novel lightweight MSR with reduced weight and dimensions.
  • Developed a 'window coil' active shielding system using simple rectangular coils on MSR walls.
  • Mapped remnant magnetic fields and coil-generated fields to determine optimal coil currents for field cancellation.

Main Results:

  • Achieved a 30% weight reduction and 40-60% reduction in external dimensions for the MSR.
  • Successfully canceled the remnant magnetic field within the central cubic meter to |B| = 670 ± 160 pT.
  • Demonstrated a significant reduction in cost, installation time, and siting restrictions compared to existing MSRs.

Conclusions:

  • The new MSR design and window coil system significantly address barriers to OPM-MEG deployment.
  • These advancements facilitate the widespread adoption of wearable, high-resolution brain imaging technology.
  • The developed MSR offers a more practical and accessible solution for advanced neuroimaging research and clinical applications.