Lehmann D, Michel C M
Neurology Department, University Hospital, Zurich, Switzerland.
Electroencephalogr Clin Neurophysiol. 1990 Sep;76(3):271-6. doi: 10.1016/0013-4694(90)90022-c.
The method treats Fast Fourier Transforms (FFTs) of multichannel EEGs so that they can be used for intracerebral source localizations. For each frequency point, the FFT results are entered into a sine-cosine diagram. Into the diagram's entry constellation (FFT constellation), a straight line (single dipole model) is fitted which produces the least square deviation sum between the entry positions and their orthogonal projections onto the straight line. The map described by the voltages between the projected positions on the straight line is the single source 'FFT approximation' of the FFT constellation. The FFT approximation map is used for dipole source localization. The squared FFT approximation map and the squared map of the forward solution of the computed dipole (power maps) closely resemble the original power map.
该方法对多通道脑电图的快速傅里叶变换（FFT）进行处理，以便将其用于脑内源定位。对于每个频率点，将FFT结果输入到一个正弦 - 余弦图中。在该图的输入星座图（FFT星座图）中，拟合一条直线（单偶极子模型），该直线在输入位置与其在直线上的正交投影之间产生最小二乘偏差和。直线上投影位置之间的电压所描述的图就是FFT星座图的单源“FFT近似”。FFT近似图用于偶极子源定位。FFT近似图的平方和计算出的偶极子正向解的平方图（功率图）与原始功率图非常相似。
