Active shielding in measurements of DC near biomagnetic fields

Author

Nowak, H. ; Haueisen, J. ; Ziolkowski, M. ; Resmer, F. ; Schüler, J. ; Giessler, F.

Volume

4

fYear

2001

fDate

2001

Firstpage

3277

Abstract

Measurements of DC near biomagnetic fields are disturbed by low frequency noise, that is not reduced sufficiently by most magnetically shielded rooms or gradiometers. An effective SQUID based active shielding system has been developed and installed at the magnetically shielded rooms in the Biomagnetic Center of the University Jena to reduce external low frequency disturbances. A reduction of the magnetic noise of about 23 dB could be achieved at 50 mHz.

Keywords

SQUID magnetometers; biomagnetism; magnetic field measurement; magnetic shielding; magnetoencephalography; 50 mHz; DC near biomagnetic field measurements; active shielding; effective SQUID based active shielding system; external low frequency disturbances; gradiometers; human stroke patients; low frequency noise; magnetic noise; magnetic source imaging; magnetically shielded rooms; periinfarct depolarizations; spreading depression; Biomagnetics; Frequency; Low-frequency noise; Magnetic field measurement; Magnetic noise; Magnetic recording; Magnetic shielding; Noninvasive treatment; SQUIDs; Superconducting magnets;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2001. Proceedings of the 23rd Annual International Conference of the IEEE

ISSN

1094-687X

Print_ISBN

0-7803-7211-5

Type

conf

DOI

10.1109/IEMBS.2001.1019524

Filename

1019524