Maximum contrast beamformer for electromagnetic mapping of brain activity

Yong-Sheng Chen, Chih Yu Cheng, Jen Chuen Hsieh, Li Fen Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Beamforming technique can be applied to map the neuronal activities from magnetoencephalographic/electroencephalographic (MEG/EEG) recordings. One of the major difficulties of the scalar-type MEG/EEG beamformer is the determination of accurate dipole orientation, which is essential to an effective spatial filter. This paper presents a new beamforming technique which exploits a maximum contrast criterion to maximize the ratio of the neuronal activity estimated in a specified active state to the activity estimated in a control state. This criterion leads to a closed-form solution of the dipole orientation. Experiments with simulation, phantom, and finger-lifting data clearly demonstrate the effectiveness, efficiency, and accuracy of the proposed method.

Original languageEnglish
Article number1673618
Pages (from-to)1765-1774
Number of pages10
JournalIEEE Transactions on Biomedical Engineering
Issue number9
StatePublished - 1 Sep 2006


  • EEG
  • Electromagnetic brain mapping
  • Maximum contrast beamformer
  • MEG


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