论文部分内容阅读
脑磁图(Magnetoencephalogram MEG)和脑电图(Electroencephalogram EEG)彼此十分相似,两者均来自相同的结构,具有时间分辨率高的特点,能分别记录头皮的磁场和电场变化,由此可以了解神经细胞的电功能。早期的发现已证实了如下的假设、即与EEG 相比,MEG 能更精确地对正常和异常的局部脑电活动进行定位。但由于上述的磁场要比地球的磁场弱约一千万倍,故只有在高质量的磁屏房内,并使用十分敏感的超导磁强计和超导量子干涉仪器方能进行MEG 检查。MEG 和EEG 中的磁场和电场均由神经细胞的电流产生。磁场由细胞内的集束电流产生,而EEG则是记录细胞外的回路电流的电压差。与EEG 相
Magnetoencephalogram MEG and Electroencephalogram EEG are very similar to each other, both from the same structure, with the characteristics of high temporal resolution, which can separately record the changes of the scalp’s magnetic field and electric field so as to understand the nerve The electrical function of the cell. Early findings have confirmed the hypothesis that MEG can locate normal and abnormal local EEG activity more accurately than EEG. However, since the above magnetic field is about 10 million times weaker than the Earth’s magnetic field, MEG inspection can only be performed in a high-quality magnetic shield with a very sensitive superconducting magnetometer and a superconducting quantum interference device. Both the magnetic field and the electric field in MEG and EEG are generated by the current of nerve cells. The magnetic field is generated by the intracellular bundling current, while the EEG is the voltage difference that records the extracellular loop current. With EEG phase