DocumentCode :
1124193
Title :
Maximum contrast beamformer for electromagnetic mapping of brain activity
Author :
Yong-Sheng Chen ; Chih-Yu Cheng ; Jen-Chuen Hsieh ; Li-Fen Chen
Author_Institution :
Dept. of Comput. Sci., Nat. Chiao Tung Univ., Hsinchu
Volume :
53
Issue :
9
fYear :
2006
Firstpage :
1765
Lastpage :
1774
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
Keywords :
electromyography; magnetoencephalography; medical signal processing; neurophysiology; phantoms; spatial filters; EEG; MEG; brain activity; dipole orientation; effective spatial filter; electroencephalography; electromagnetic mapping; finger-lifting data; magnetoencephalography; maximum contrast beamformer; neuronal activities; phantom; Biomedical imaging; Brain modeling; Electroencephalography; Electromagnetic fields; Electromagnetic measurements; Hospitals; Inverse problems; Magnetic resonance imaging; Neuroscience; State estimation; EEG; MEG; electromagnetic brain mapping; maximum contrast beamformer; Algorithms; Brain; Brain Mapping; Computer Simulation; Diagnosis, Computer-Assisted; Electroencephalography; Evoked Potentials, Motor; Humans; Magnetoencephalography; Models, Neurological;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.2006.878115
Filename :
1673618
Link To Document :
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