| Autor: |
Tilmann H. Sander, Urban Marhl, Vojko Jazbinšek |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Current Directions in Biomedical Engineering, Vol 7, Iss 2, Pp 543-546 (2021) |
| ISSN: |
2364-5504 |
| DOI: |
10.1515/cdbme-2021-2138 |
| Popis: |
Some optically pumped magnetometer (OPM) sensors available for biomagnetic investigations have a linear range limited to +- 1 nT due to the specific properties of their open loop operation. In a two-layer magnetically shielded room of type Ak3b/Vacoshield Advanced with an external active compensation we studied how much sensor movement is allowed until amplitudes exceed the linearity range. Intentional movements were performed by a subject wearing an OPM-MEG sensor array. It was found that movements of 8 cm did yield non-linear amplitudes, but a reduction of the movement in half already preserves linearity. Despite movements, the heartbeat was found to generate a periodic signal, although the generating mechanism could not be identified so far. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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