| Zugriffsnummer | 18062 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Discrimination of multiple sources using a SQUID vector magnetometer |
| Autor(in); Institution |
Burghoff, Martin; 8.2, Biosignale, PTB-Berlin
Schnabel, Allard; 8.2, Biosignale, PTB-Berlin
Drung, Dietmar; 7.5, Tieftemperaturthermodynamik und -technologie, PTB-Berlin
Thiel, Florian; 8.2, Biosignale, PTB-Berlin
Knappe-Grüneberg, Silvia; 8.2, Biosignale, PTB-Berlin
Hartwig, Stefan; 8.2, Biosignale, PTB-Berlin
Kosch, Olaf; 8.2, Biosignale, PTB-Berlin
Trahms, Lutz; 8.2, Biosignale, PTB-Berlin
Koch, Hans; 8, Medizinphysik und metrologische Informationstechnik, PTB-Berlin
|
| Quelle/Jahr | Neurology and Clinical Neurophysiology:(2004), 2004:67, 1 - 4 |
| ISSN | 1526-8748 ; 1081-1818 |
| URL | |
| Verlag | Cambridge, Mass.: MIT Press |
| Freie Schlagworte | Source discrimination ; Multiple sources ; Vector magnetometer |
| Zusammenfassung | For many biomagnetic applications the discrimination between simultaneously active sources is required. To evaluate the performance of a given SQUID system in this respect, the angle between the signal vectors of different sources is used. If the angle reaches large values, discrimination between the multiple sources is possible. We tested this approach with the first module of a new vector magnetometer system consisting of 19 identical modules. Two examples of measurements illustrate the differentiation of multiple sources, i.e. the fetal and the mother’s heart signal, and alpha rhythm and heart signal in MEG recordings. This first module of a vector magnetometer system containing 16 SQUIDs is operated at PTB in the new Berlin Magnetically Shielded Room (BMSR 2) The spatial configuration of the 16 integrated SQUID magnetometers of the module is such that all three vector components of the magnetic field can be calculated in three measurement planes at 1.5cm, 5 cm, and 10.5 cm above the Dewar bottom, respectively. The SQUID magnetometer channels have a typical white noise level of less than 2.3 fT/Hz1/2 at 1kHz. |
