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| Content Provider | Springer Nature Link |
|---|---|
| Author | Baskaran, R. Janawadkar, M. P. |
| Copyright Year | 2014 |
| Abstract | Magnetic fields due to neuronal currents inside the brain have been modeled as arising due to a current dipole positioned in a thin hemispherical shell. Magnetic signals due to this current dipole at measurement locations, as sensed by an array of superconducting first order axial gradiometric pickup loops distributed uniformly in a concentric shell above scalp, have been simulated. The difference in the simulated magnetic field between two loops constituting the axial gradiometer is represented in terms of an infinite series expansion based on spherical harmonics. The external magnetic noise has been modeled as a magnetic dipole and is represented by another set of terms in infinite series expansion based on spherical harmonics. The block matrix inversion has been utilized to extract the magnetic signal due to neuronal currents rejecting the unwanted external magnetic noise from total simulated signal from a set of 64 gradiometers using signal space separation method. This rejection of the strong external magnetic noise has also been demonstrated using block-matrix inversion for sources of external magnetic noise with radial position as close as 0.4 m. |
| Starting Page | 1087 |
| Ending Page | 1091 |
| Page Count | 5 |
| File Format | |
| ISSN | 09731458 |
| Journal | Indian Journal of Physics |
| Volume Number | 88 |
| Issue Number | 10 |
| e-ISSN | 09749845 |
| Language | English |
| Publisher | Springer India |
| Publisher Date | 2014-06-04 |
| Publisher Place | India |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | SQUIDs Magnetoencephalography Axial gradiometer Pseudoinverse Block matrix Signal space separation method Physics Astrophysics and Astroparticles |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy |
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