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Title: Design and performance of the LANL 158-channel magnetoencephalography system

Abstract

Design and performance for a recently completed whole-head magnetoencephalography (MEG) system using a superconducting imaging-surface (SIS) surrounding an array of SQUID magnetometers is reported. The helmet-like SIS is hemispherical in shape with a brim. The SIS images nearby sources while shields sensors from ambient magnetic noise. The shielding factor depends on magnetometer position and orientation. Typical shielding values of 200 in central sulcus area have been observed. Nine reference channels form three vector magnetometers, which are placed outside SIS. Signal channels consist of 149 SQUID magnetometers with 0.84nT/{Phi}{sub 0} field sensitivity and less then 3 fT/{radical}Hz noise. Typical SQUID - room temperature separations are about 20mm in the cooled state. Twelve 16-channel flux-lock loop units are connected to two 96-channel control units allowing up to 192 total SQUID channels. The control unit includes signal conditioning circuits as well as system test and control circuits. After conditioning all signals are fed to 192-channel, 24-bit data acquisition system capable of sampling up to 48kSa/sec/channel. The SIS-MEG system enables high-quality human functional brain data to be recorded in a one-layer magnetically shielded room.

Authors:
 [1]; ;  [2];  [3]; ;  [4];
  1. Andrei N.
  2. Michelle A.
  3. Elaine D.
  4. Eric Y.
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
976185
Report Number(s):
LA-UR-02-3147
TRN: US201009%%381
Resource Type:
Conference
Resource Relation:
Conference: Submitted to: 13th International Conference on Biomagnetism, Jena, Germany, August 10-14, 2002
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; 47 OTHER INSTRUMENTATION; ELECTROENCEPHALOGRAPHY; SQUID DEVICES; BRAIN; DATA ACQUISITION SYSTEMS; DESIGN; MAGNETOMETERS; PERFORMANCE; SENSITIVITY; SHIELDS; SIGNAL CONDITIONING

Citation Formats

Matlachov, A N, Kraus, Jr, Robert H, Espy, M A, Best, E D, Briles, M Carolyn, Raby, E Y, and Flynn, E R. Design and performance of the LANL 158-channel magnetoencephalography system. United States: N. p., 2002. Web.
Matlachov, A N, Kraus, Jr, Robert H, Espy, M A, Best, E D, Briles, M Carolyn, Raby, E Y, & Flynn, E R. Design and performance of the LANL 158-channel magnetoencephalography system. United States.
Matlachov, A N, Kraus, Jr, Robert H, Espy, M A, Best, E D, Briles, M Carolyn, Raby, E Y, and Flynn, E R. 2002. "Design and performance of the LANL 158-channel magnetoencephalography system". United States. https://www.osti.gov/servlets/purl/976185.
@article{osti_976185,
title = {Design and performance of the LANL 158-channel magnetoencephalography system},
author = {Matlachov, A N and Kraus, Jr, Robert H and Espy, M A and Best, E D and Briles, M Carolyn and Raby, E Y and Flynn, E R},
abstractNote = {Design and performance for a recently completed whole-head magnetoencephalography (MEG) system using a superconducting imaging-surface (SIS) surrounding an array of SQUID magnetometers is reported. The helmet-like SIS is hemispherical in shape with a brim. The SIS images nearby sources while shields sensors from ambient magnetic noise. The shielding factor depends on magnetometer position and orientation. Typical shielding values of 200 in central sulcus area have been observed. Nine reference channels form three vector magnetometers, which are placed outside SIS. Signal channels consist of 149 SQUID magnetometers with 0.84nT/{Phi}{sub 0} field sensitivity and less then 3 fT/{radical}Hz noise. Typical SQUID - room temperature separations are about 20mm in the cooled state. Twelve 16-channel flux-lock loop units are connected to two 96-channel control units allowing up to 192 total SQUID channels. The control unit includes signal conditioning circuits as well as system test and control circuits. After conditioning all signals are fed to 192-channel, 24-bit data acquisition system capable of sampling up to 48kSa/sec/channel. The SIS-MEG system enables high-quality human functional brain data to be recorded in a one-layer magnetically shielded room.},
doi = {},
url = {https://www.osti.gov/biblio/976185}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2002},
month = {Tue Jan 01 00:00:00 EST 2002}
}

Conference:
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