Noise cancellation for a whole-head magnetometer-based MEG system in hospital environment

Biomedical Physics & Engineering Express
Limin SunY Okada

Abstract

We describe a strategy of removing magnetic field interference for a whole-head pediatric magnetoencephalography (MEG) system ("babyMEG") installed in a hospital. The 375-channel sensor array of babyMEG consists entirely of magnetometers in two layers to maximize the sensitivity for detecting MEG signals from infants, toddlers, and young children. It is equipped with a continuously operating closed-cycle helium recycler to reduce the operating costs. These two features pose special challenges for noise cancellation. Our strategy uses a combination of several methods. The system is installed in a light-weight, magnetically shielded room (MSR) equipped with an active external shielding. In addition we employ two software-based techniques - a signal space projection (SSP) technique and a synthetic gradiometer (SG) method - for removing the environmental magnetic noise in real time and displaying the output online. The shielding effects are: passive shielding - 36 dB, active shielding - 12 dB, SSP - 40 dB and SG - 40 dB, for a combined maximum shielding of about 90 dB at 0.1 Hz. We evaluated the performance of the babyMEG after applying the noise cancellation techniques. The dipole localization errors were <3 mm after averaging 50 ...Continue Reading

References

Mar 1, 1997·Medical & Biological Engineering & Computing·M A Uusitalo, R J Ilmoniemi
Apr 28, 1999·IEEE Transactions on Bio-medical Engineering·G Nolte, G Curio
Jun 20, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Daniel KonnRichard Bowtell
Sep 24, 2004·Brain Topography·Samu TauluJuha Simola
Jul 17, 2012·Physics in Medicine and Biology·F ChellaV Pizzella
Apr 16, 2013·Journal of Neuroscience Methods·I Tal, M Abeles
Feb 27, 2016·Clinical Physiology and Functional Imaging·Paul D Loprinzi
Oct 27, 2016·The Review of Scientific Instruments·Yoshio OkadaDouglas Paulson
Jun 3, 2017·The Review of Scientific Instruments·Limin SunMatti Hämäläinen
Apr 6, 2018·Journal of Neuroscience Methods·Lorenz EschChristoph Dinh

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