Lightweight and wearable magnetoencephalography system based on spatially-grid constrained coils and compact magnetically shielded room
Shuai Dou,
Xikai Liu,
Ya Deng,
Yimin Chen,
Pengfei Song,
Tong Wen,
Bangcheng Han
Affiliations
Shuai Dou
School of Instrumentation and Optoelectronics Engineering, Beihang University, Beijing 100191, China; Ningbo Institute of Technology, Beihang University, Ningbo 315800, China; Institute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, China
Xikai Liu
Ningbo Institute of Technology, Beihang University, Ningbo 315800, China; Zhejiang Engineering Research Center of Precision Electromagnetic Control Technology and Equipment, Ningbo 315800, China; Corresponding authors.
Ya Deng
Ningbo Institute of Technology, Beihang University, Ningbo 315800, China; Zhejiang Engineering Research Center of Precision Electromagnetic Control Technology and Equipment, Ningbo 315800, China; Corresponding authors.
Yimin Chen
School of Instrumentation and Optoelectronics Engineering, Beihang University, Beijing 100191, China
Pengfei Song
Ningbo Institute of Technology, Beihang University, Ningbo 315800, China; Zhejiang Engineering Research Center of Precision Electromagnetic Control Technology and Equipment, Ningbo 315800, China
Tong Wen
School of Instrumentation and Optoelectronics Engineering, Beihang University, Beijing 100191, China; Ningbo Institute of Technology, Beihang University, Ningbo 315800, China
Bangcheng Han
School of Instrumentation and Optoelectronics Engineering, Beihang University, Beijing 100191, China; Institute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, China
Magnetoencephalography based on optically pumped magnetometers can passively detect the ultra-weak brain magnetic field signals, which has significant clinical application prospects for the diagnosis and treatment of cerebral disorders. This paper proposes a brain magnetic signal measurement method on the basis of the active–passive coupling magnetic shielding strategy and helmet-mounted detection array, which has lower cost and comparable performance over the existing ones. We first utilized the spatially-grid constrained coils and biplanar coils with proportion–integration–differentiation controller with tracking differentiator to ensure a near-zero and stable magnetic field environment with large uniform region. Subsequently, we implemented the brain magnetic signal measurement with the subject randomly moving fingers through tapping a keyboard and with the condition of opening and closing the eyes. Effectively induced brain magnetic signals were detected at the motor functional area and occipital lobe area in the two experiments, respectively. The proposed method will contribute to the development of functional brain imaging.
