Title :
Active shielding in measurements of DC near biomagnetic fields
Author :
Nowak, H. ; Haueisen, J. ; Ziolkowski, M. ; Resmer, F. ; Schüler, J. ; Giessler, F.
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;
Conference_Titel :
Engineering in Medicine and Biology Society, 2001. Proceedings of the 23rd Annual International Conference of the IEEE
Print_ISBN :
0-7803-7211-5
DOI :
10.1109/IEMBS.2001.1019524
