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This content will become publicly available on October 16, 2018

Title: A 20-channel magnetoencephalography system based on optically pumped magnetometers

In this paper, we describe a multichannel magnetoencephalography (MEG) system that uses optically pumped magnetometers (OPMs) to sense the magnetic fields of the human brain. The system consists of an array of 20 OPM channels conforming to the human subject's head, a person-sized magnetic shield containing the array and the human subject, a laser system to drive the OPM array, and various control and data acquisition systems. We conducted two MEG experiments: auditory evoked magnetic field and somatosensory evoked magnetic field, on three healthy male subjects, using both our OPM array and a 306-channel Elekta-Neuromag superconducting quantum interference device (SQUID) MEG system. The described OPM array measures the tangential components of the magnetic field as opposed to the radial component measured by most SQUID-based MEG systems. Finally, herein, we compare the results of the OPM- and SQUID-based MEG systems on the auditory and somatosensory data recorded in the same individuals on both systems.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Aegis Technologies Group Inc., Albuquerque, NM (United States)
  3. Infinera Corporation, Sunnyvale, CA (United States)
  4. Candoo Systems Inc., Coquitlam, BC (Canada)
  5. The Mind Research Network and Lovelace Biomedical and Environmental Research Inst., Albuquerque, NM (United States)
  6. Rio Grande Neurosciences, Inc., Santa Fe, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Neurosurgery
Publication Date:
Report Number(s):
SAND2017-4181J
Journal ID: ISSN 0031-9155; 652641
Grant/Contract Number:
NA0003525; R01EB013302
Type:
Accepted Manuscript
Journal Name:
Physics in Medicine and Biology
Additional Journal Information:
Journal Volume: 62; Journal Issue: 23; Journal ID: ISSN 0031-9155
Publisher:
IOP Publishing
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); National Inst. of Health (NIH) (United States)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; 47 OTHER INSTRUMENTATION; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; magnetoencephalography; optically pumped magnetometer (OPM); auditory evoked magnetic field (AEF); somatosensory evoked magnetic field (SEF); superconducting quantum interference device (SQUID); spin-exchange relaxation-free (SERF); diffractive optical element (DOE)
OSTI Identifier:
1429765