Multi-sensor magnetoencephalography with atomic magnetometers
Cort N Johnson1, P D D Schwindt, M Weisend
1Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185-1082, USA. cort.johnson@alum.mit.edu
Physics in Medicine and Biology
|August 14, 2013
Summary
Researchers detected human brain magnetic fields using advanced atomic magnetometers. This breakthrough enables non-cryogenic magnetoencephalography for better brain activity mapping.
Area of Science:
- Biophysics
- Neuroscience
- Sensor Technology
Background:
- Magnetoencephalography (MEG) traditionally requires cryogenic cooling, limiting its widespread application.
- Atomic magnetometers offer a potential alternative for non-invasive brain activity measurement.
Purpose of the Study:
- To demonstrate the feasibility of using rubidium spin-exchange-relaxation-free (SERF) magnetometers for magnetoencephalography (MEG).
- To develop a multi-sensor atomic magnetometer system for detecting human brain magnetic fields.
Main Methods:
- Utilized two independent, simultaneously operating rubidium SERF magnetometers.
- Recorded evoked responses from auditory stimulation in multiple subjects using multi-channel magnetometers placed on opposite sides of the head.
- Applied advanced signal processing techniques to multi-channel measurements for enhanced signal quality.
Main Results:
- Successfully detected magnetic fields from the human brain using atomic magnetometers.
- Demonstrated the first multi-sensor atomic magnetometer magnetoencephalography system.
- Achieved improved signal quality through multi-channel measurements and signal processing.
Conclusions:
- This study presents a novel, non-cryogenic approach to magnetoencephalography.
- The developed framework supports the creation of a whole-head atomic magnetometer array for advanced source localization.
- Paves the way for more accessible and potentially portable brain imaging technologies.
