传感器到源距离对磁性神经肌肉信号的影响
Haodi Yang1,2,3,4, Thomas Klotz5, Leonardo Gizzi6
1Department of Neural Dynamics and Magnetoencephalography, Hertie-Institute for Clinical Brain Research, University of Tübingen, Otfried-Müller-Str.47, 72076, Tübingen, Germany.
Scientific reports
|June 20, 2025
概括
磁力共振 (MMG) 提供无接触的神经肌肉研究,但信号强度随着距离的增长而下降. 目前的光磁计技术无法可靠地测量超过两厘米的MMG.
科学领域:
- 生物医学工程 生物医学工程
- 神经科学是一个神经科学.
- 生物物理学的生物物理.
背景情况:
- 磁筋学 (MMG) 是一种无接触的方法,用于研究神经肌肉活动.
- 与电肌图 (EMG) 不同,MMG避免了皮肤准备和电极附着.
- MMG的主要限制是信号衰减随着传感器到源距离的增加.
研究的目的:
- 系统地调查传感器到源距离对磁力学图 (MMG) 信号的影响.
- 为了比较距离的影响,使用 in vivo 和 in silico 实验方法.
- 确定在不同距离的MMG中使用当前光磁力计 (OPM) 技术的可行性.
主要方法:
- 在体内实验中,使用三轴OPM同时记录表面肌电图 (EMG) 和MMG.
- 在体实验中,使用多尺度肌肉模型来模拟MMG信号特征.
- 模拟预测了距离对信号噪声比 (SNR) 和光谱含量在定义噪声水平 (0.5-1 pT RMS) 下的影响.
主要成果:
- 在经过测试的环境噪声条件下,使用OPMs对指 flexor 肌肉活动的可靠检测在2厘米之外是不可能的.
- 在体实验中,在0.5厘米的距离上,MMG的高SNR (8-29) 得到证明.
- 距离的增加导致MMG信号的中位频率含量增加,这归因于噪声效应.
结论:
- 目前的OPM技术和传统的磁屏蔽对于可靠的MMG测量中等大小肌肉自发收缩超过2厘米是不够的.
- 该研究强调距离是限制MMG实际应用的关键因素.
- 传感器技术或屏蔽的进一步进步可能是必要的,以扩大MMG的有效范围.
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