Optically pumped magnetometers enhance neuroimaging performance-An EEG, OPM, and SQUID-MEG study

Area of Science:

• Neuroscience
• Biophysics
• Medical Imaging

Background:

• Non-invasive neuroimaging techniques like EEG and MEG are crucial for understanding brain function.
• Higher signal-to-noise ratio (SNR) is essential for advancing our understanding of neural circuits and human cognition.
• Current methods face limitations in achieving sufficient SNR for detailed analysis.

Purpose of the Study:

• To compare the performance of optically pumped magnetometers (OPMs) against electroencephalography (EEG) and conventional magnetoencephalography (MEG).
• To evaluate the SNR and inter-trial phase coherence (ITPC) of OPMs in a 40 Hz auditory steady-state paradigm.
• To demonstrate the potential of OPMs for enhancing non-invasive neuroimaging.

Main Methods:

• Utilized a 40 Hz auditory steady-state paradigm.
• Employed optically pumped magnetometers (OPMs) for neuroimaging.
• Applied spatial filters to maximize the representation of evoked responses.
• Compared OPMs with electroencephalography (EEG) and conventional magnetoencephalography (MEG) in terms of SNR and ITPC.

Main Results:

• OPMs demonstrated significantly higher SNR and ITPC compared to both EEG and conventional MEG.
• OPM SNRs were up to 205% higher than EEG and up to 40% higher than conventional MEG.
• A small number of OPM sensors (10-16) outperformed 56 EEG electrodes.

Conclusions:

• OPMs represent a significant advancement in non-invasive neuroimaging technology.
• The enhanced SNR and ITPC provided by OPMs can overcome limitations of current methods.
• OPMs hold great potential for future breakthroughs in basic and translational neuroscience research.