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Advances in Radio Science An open-access journal of the U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V.
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Volume 10
Adv. Radio Sci., 10, 93–97, 2012
https://doi.org/10.5194/ars-10-93-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Adv. Radio Sci., 10, 93–97, 2012
https://doi.org/10.5194/ars-10-93-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

  18 Sep 2012

18 Sep 2012

Improved measurement surface for MEG using magnetic-dipole sources and a spherical-multipole expansion

F. Argin, H. Ahrens, and L. Klinkenbusch F. Argin et al.
  • Institut für Elektrotechnik und Informationstechnik, Christian-Albrechts-Universität zu Kiel, Germany

Abstract. The multipole representation of Magnetoencephalography (MEG) signals is known as a useful tool for distinguishing between magnetic fields arising from the brain and external disturbances. In this contribution we extend this concept and show that a closed double-layer surface with magnetometer probes is better suited to determine the corresponding multipole amplitudes αlm than a conventional single-layer surface with gradiometers and magnetometer probes. For two different source configurations we show that the αlm rapidly converge to the exact values. This proof of concept motivates to further optimize the geometry of the double-layer surface and the sensors' positions.

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