A study of equivalent source techniques for high-resolution EEG imaging

Dezhong Yao, Yingchun Zhou, Min Zeng, Silu Fan, Jie Lian, Dongsheng Wu, Xinyu Ao, Lin Chen, Bin He

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


High-resolution EEG imaging has been an important topic in recent EEG research, and much work has been done on the two equivalent source imaging techniques: the equivalent distributed dipole-layer source imaging technique (EST) and the equivalent multipole source imaging technique (SAT). In this paper we first develop a forward density formula for a spherical equivalent distributed dipole layer of an arbitrary dipole in a three-concentric-sphere head model. It is clarified using the derived forward formula that the equivalent dipole-layer source and equivalent multipole source are interrelated in theory. Finally, simulation comparisons are conducted, the results of which suggest that EST has a higher spatial resolution than SAT when both of them are implemented by a truncated singular value decomposition algorithm. This is due to the different singularities of the inversion equations involved in the two techniques. An empirical VEP data study also shows that EST is better than SAT in providing higher spatial resolution EEG imaging.

Original languageEnglish (US)
Pages (from-to)2255-2266
Number of pages12
JournalPhysics in Medicine and Biology
Issue number8
StatePublished - Aug 25 2001


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