Feasibility study on on-board magnetoencephalography with optically pumped magnetometers

Abstract

In this study, the theoretical feasibility of utilizing optically pumped magnetometers for on-board magnetoencephalography measurements was explored. Simulations were conducted to generate steady-state visually evoked response (SSVER) signals that incorporate vehicle noise, and a noise reduction strategy specifically designed for on-board applications is proposed. Upon engine activation, the magnetic field vibration of a conventional gasoline-powered vehicle measured in an urban environment was found to be approximately seven times greater in the vertical direction than in the horizontal direction. The maximum signal-to-noise ratio of the SSVER in an automotive environment was simulated to be −110 dB. A 350-mm side-length, 20-turn active compensation coil can achieve an attenuation rate of approximately 28 dB at a target frequency of 24 Hz for measurements inside the vehicle cabin. Therefore, an increase in the number of coil turns would result in a higher attenuation rate. Further noise attenuation to the level inside a magnetically shielded room requires approximately 80 dB.