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Alem O, Hughes KJ, Buard I, Cheung TP, Maydew T, Griesshammer A, Holloway K, Park A, Lechuga V, Coolidge C, Gerginov M, Quigg E, Seames A, Kronberg E, Teale P, Knappe S. An integrated full-head OPM-MEG system based on 128 zero-field sensors. Front Neurosci 2023; 17:1190310. [PMID: 37389367 PMCID: PMC10303922 DOI: 10.3389/fnins.2023.1190310] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 05/24/2023] [Indexed: 07/01/2023] Open
Abstract
Compact optically-pumped magnetometers (OPMs) are now commercially available with noise floors reaching 10 fT/Hz1/2. However, to be used effectively for magnetoencephalography (MEG), dense arrays of these sensors are required to operate as an integrated turn-key system. In this study, we present the HEDscan, a 128-sensor OPM MEG system by FieldLine Medical, and evaluate its sensor performance with regard to bandwidth, linearity, and crosstalk. We report results from cross-validation studies with conventional cryogenic MEG, the Magnes 3,600 WH Biomagnetometer by 4-D Neuroimaging. Our results show high signal amplitudes captured by the OPM-MEG system during a standard auditory paradigm, where short tones at 1000 Hz were presented to the left ear of six healthy adult volunteers. We validate these findings through an event-related beamformer analysis, which is in line with existing literature results.
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Affiliation(s)
- Orang Alem
- FieldLine Medical, Boulder, CO, United States
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, United States
- FieldLine Industries, Boulder, CO, United States
| | - K. Jeramy Hughes
- FieldLine Medical, Boulder, CO, United States
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, United States
- FieldLine Industries, Boulder, CO, United States
| | - Isabelle Buard
- Anschutz Medical Campus, University of Colorado Denver, Denver, CO, United States
| | - Teresa P. Cheung
- FieldLine Medical, Boulder, CO, United States
- School of Engineering, Simon Fraser University, Burnaby, BC, Canada
- Surrey Memorial Hospital, Fraser Health Authority, Surrey, BC, Canada
| | | | | | | | - Aaron Park
- FieldLine Medical, Boulder, CO, United States
| | | | | | - Marja Gerginov
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, United States
| | - Erik Quigg
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, United States
| | - Alexander Seames
- Anschutz Medical Campus, University of Colorado Denver, Denver, CO, United States
| | - Eugene Kronberg
- Anschutz Medical Campus, University of Colorado Denver, Denver, CO, United States
| | - Peter Teale
- Anschutz Medical Campus, University of Colorado Denver, Denver, CO, United States
| | - Svenja Knappe
- FieldLine Medical, Boulder, CO, United States
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, United States
- FieldLine Industries, Boulder, CO, United States
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