| Zugriffsnummer | 46891 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | A 50 channel optically pumped magnetometer MEG in an externally actively shielded two-layer room |
| Autor(in); Institution |
Sander-Thömmes, Tilmann; 8.2, Biosignale, PTB-Berlin
Marhl, Urban; 8.2, Biosignale, PTB-Berlin; University of Maribor, Maribor, SLOVENIA; Institute of Mathematics, Physics and Mechanics, Ljubljana, SLOVENIA
Brühl, Rüdiger; 8.1, Biomedizinische Magnetresonanz, PTB-Berlin
Middelmann, Thomas; 8.2, Biosignale, PTB-Berlin
|
| Quelle/Jahr | Selected Articles from the 13th ICBEM. 26-28 May, 2021. International Journal of Bioelectromagnetism: 23 (2021), 1, 5/1 - 5/4 |
| ISSN | 1456-7857 (PRINT) ; 1456-7865 (ONLINE) |
| URL | |
| Verlag | Tampere: International Society for Bioelectromagnetism (ISBEM) |
| Konferenzangaben | 13th International Conference on Bioelectromagnetism (ICBEM), Virtual Conference, 26-28, May, 2021 |
| Freie Schlagworte | Optically pumped magnetometer ; magnetoencephalography ; shielded room ; active shielding ; linear operation |
| Zusammenfassung | Dynamic variations and slow field drifts exceeding 1 nT can be a challenge for optically pumped magnetometers (OPM) used for magnetoencephalography in existing three layer magnetically shielded rooms. These drifts can drive the sensors into non-linearity or worse, saturate the sensors. Here we describe that a triple axis active shielding coil system enclosing the outside surfaces of the room is sufficient to allow OPM operation in the linear regime. Auditory evoked fields for two types of sensor placement show the typical bi-hemispheric activation and the dipolar field map on a single hemisphere. Since the OPMs measure two orthogonal components of the field the sensors can be oriented to measure the quasi-radial and a tangential component of the brain activation at the same time. Results show qualitatively the theoretically expected field patterns. |
| Kostenfreier Zugang | Open Access Gold |
| Themenbereich der Metrologie | Metrologie in der Medizin |