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基于OPM-MEG中斜投影的扩展均场校正方法

Fulong Wang¹, Fuzhi Cao², Yujie Ma¹

¹Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering, Beihang University, 100191, Beijing, China; Hangzhou Institute of Extremely-Weak Magnetic Field Major National Science and Technology Infrastructure, Hangzhou, 310051, China.

|January 5, 2025

概括

基于光学的磁力计的磁大脑摄影 (OPM-MEG) 提供了灵活的脑部成像. 一种新的斜投影方法 (opHFC) 显著改善了OPM-MEG中的噪声抑制,提高了研究和临床使用的信号质量.

科学领域:

神经成像是一种神经成像.
生物物理学的生物物理.
信号处理信号处理

背景情况:

基于光学磁仪的磁脑摄影 (OPM-MEG) 是一种灵活,可穿戴的神经成像技术.
对OPM-MEG来说,环境噪声抑制是至关重要的,特别是对于有限的通道.
像子空间投影和均质场校正 (HFC) 这样的现有方法在复杂的噪声环境中存在局限性.

研究的目的:

为OPM-MEG系统开发一种新的降噪方法.
为了解决处理复杂,不均噪音的现有方法的局限性.
在OPM-MEG.中提高传感器和源级的信号质量.

主要方法:

提出了一种基于斜投影 (opHFC) 的扩展均场校正方法.
opHFC 构建了一个斜投影操作器,将信号分为内部和外部组件.
使用时间延伸来消除复杂的干扰,并解决信号和噪声子空间之间的非对角性.

主要成果:

与四种基准方法相比,opHFC通过模拟和实验证明了优越的噪声抑制.
该方法实现了最小的信号扭曲,提高了传感器和源级的信号质量.
使用听觉和体感觉唤起的OPM-MEG数据验证了性能.

结论:

opHFC提供了一种新且有效的方法来减少OPM-MEG的干扰.
该方法扩展了OPM-MEG系统的应用场景.
提供高质量的信号,对于科学研究和临床应用至关重要.

关键词:

干扰抑制可以抑制干扰.磁脑电图 (MEG) 是一种磁脑电图.斜的投影是斜的投影.光学的磁力计 (OPM)亚空间投影的部分空间投影.

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