Study of signal reconstruction in a planar sensor array MEG with optically pumped magnetometers

• Published in: Transactions of Japanese Society for Medical and Biological Engineering Vol. Annual59; no. Proc; pp. 767 - 769
• Main Authors: Kobayashi, Tetsuo, Saito, Kota
• Format: Journal Article
• Language: Japanese
• Published: Japanese Society for Medical and Biological Engineering 2021; 公益社団法人 日本生体医工学会
• ISSN: 1347-443X; 1881-4379
• DOI: 10.11239/jsmbe.Annual59.767

The measurements of conventional SQUID-MEG system is performed with the head fixed, but it is influenced by the size and shape of the head. Therefore, we studied the usefulness of a planar sensor array MEG system with optically pumped magnetometers (OPMs) by taking advantage of OPMs.By simulation, it is assumed that the OPM modules surface with a first-order gradiometer structure arranged in a plane is in contact with the back of the head of the subject. At first, we calculated the evoked response in the primary visual cortex by visual stimulation in the shield room while changing the number of sensors. Next, for each number of sensors, we analyzed whether the signal source could be reconstructed using the generalized least squares method.The results show that it was possible to reconstruct the signal source activities with high accuracy even in OPM-MEG measurement with fewer sensors than those of SQUID-MEG.