Signal-space projection method for separating MEG or EEG into components

被引：640

作者：

Uusitalo, MA

Ilmoniemi, RJ

机构：

[1] Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology

[2] BioMag Laboratory, Medical Engineering Centre, Helsinki University Central Hospital

来源：

MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING | 1997年 / 35卷 / 02期

基金：

芬兰科学院;

关键词：

brain mapping; electroencephalography; equivalent current dipole; functional imaging; inverse problem; magnetoencephalography; signal-space projection; source analysis;

D O I：

10.1007/BF02534144

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

The mathematical basis of signal-space projection (SSP) method was related to other comparable methods and the accuracy of the method was analyzed. Projection operators were constructed to divide the electroencephalography (EEG) and magnetoencephalography (MEG) signals into two parts. Errors were inversely proportional to the signal-to-noise ratio and sin Θ. The directions of the signals, the locations and orientations of the dipoles included in the projection operator were assumed to be known. The error ΔΓ in knowing the exact directions in the signal space caused additional noise in the analysis. The angle Θ between component vectors determined the separability of the two sources.

引用

页码：135 / 140

页数：6

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