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  • Title: Maximum contrast beamformer for electromagnetic mapping of brain activity.
    Author: Chen YS, Cheng CY, Hsieh JC, Chen LF.
    Journal: IEEE Trans Biomed Eng; 2006 Sep; 53(9):1765-74. PubMed ID: 16941832.
    Abstract:
    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.
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