Improved measurement surface for MEG using magnetic-dipole sources and a spherical-multipole expansion
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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Copernicus Publications
2012-09-01
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| Series: | Advances in Radio Science |
| Online Access: | http://www.adv-radio-sci.net/10/93/2012/ars-10-93-2012.pdf |
| Summary: | 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
α<sub>lm</sub> than a conventional single-layer surface with gradiometers
and magnetometer probes. For two different source configurations we show that
the α<sub>lm</sub> 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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| ISSN: | 1684-9965 1684-9973 |