Comput Math Methods Med - Source activity correlation effects on LCMV beamformers in a realistic measurement environment.

Tópicos

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Resumo

In EEG and MEG studies on brain functional connectivity and source interactions can be performed at sensor or source level. Beamformers are well-established source-localization tools for MEG/EEG signals, being employed in source connectivity studies both in time and frequency domain. However, it has been demonstrated that beamformers suffer from a localization bias due to correlation between source time courses. This phenomenon has been ascertained by means of theoretical proofs and simulations. Nonetheless, the impact of correlated sources on localization outputs with real data has been disputed for a long time. In this paper, by means of a phantom, we address the correlation issue in a realistic MEG environment. Localization performances in the presence of simultaneously active sources are studied as a function of correlation degree and distance between sources. A linear constrained minimum variance (LCMV) beamformer is applied to the oscillating signals generated by the current dipoles within the phantom. Results show that high correlation affects mostly dipoles placed at small distances (1, 5 centimeters). In this case the sources merge. If the dipoles lie 3 centimeters apart, the beamformer localization detects attenuated power amplitudes and blurred sources as the correlation level raises.

Resumo Limpo

eeg meg studi brain function connect sourc interact can perform sensor sourc level beamform wellestablish sourceloc tool megeeg signal employ sourc connect studi time frequenc domain howev demonstr beamform suffer local bias due correl sourc time cours phenomenon ascertain mean theoret proof simul nonetheless impact correl sourc local output real data disput long time paper mean phantom address correl issu realist meg environ local perform presenc simultan activ sourc studi function correl degre distanc sourc linear constrain minimum varianc lcmv beamform appli oscil signal generat current dipol within phantom result show high correl affect most dipol place small distanc centimet case sourc merg dipol lie centimet apart beamform local detect attenu power amplitud blur sourc correl level rais

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