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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Knuutila, J.E.T. Ahonen, A.I. Hamalainen, M.S. Kajola, M.J. Laine, P.P. Lounasmaa, O.V. Parkkonen, L.T. Simola, J.T.A. Tesche, C.D. |
| Copyright Year | 1965 |
| Abstract | A 122-channel neuromagnetometer with a helmet-shaped detector array covering the entire head allows simultaneous recording of magnetic fields over the whole cortex. The instrument has 122 planar first-order gradiometers in dual units at 61 measurement sites. The SQUIDs are directly coupled to the read-out electronics, with amplifier noise cancellation to eliminate the need for separate preamplifiers inside the magnetically shielded room. The authors analyze the performance of the device and compare it with traditional axial gradiometer arrays by considering signal-to-noise ratios, spatial sampling theory, confidence intervals for equivalent current dipole fits, and information-theoretical channel capacity. The analysis includes the fact that instrument noise is smaller than the background activity of the brain; the signal-to-noise ratio and the resolution of the planar array are in that case equal to or better than that of an axial array. The number of channels and their spacing are very suitable for neuromagnetic measurements.< |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 3315 |
| Ending Page | 3320 |
| Page Count | 6 |
| File Size | 670228 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 29 |
| Issue Number | 6 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1993-11-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | SQUIDs Magnetic field measurement Signal to noise ratio Magnetic shielding Instruments Signal analysis Magnetic analysis Detectors Sensor arrays Magnetic heads |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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