AI Article Synopsis
- fMEG (fetal magnetoencephalogram) signals can be significantly affected by interference from maternal and fetal heart signals, but these interferences can be removed using orthogonal projection techniques.
- This process redistributes the fMEG signals across different channels, which can be corrected to accurately reflect the original signal's source.
- By modeling the fetal head as either electrically transparent or isolated, researchers found that the isolated model better represented the fMEG data, confirming that the signals originated from within the fetal head and that the corrections applied were valid.
Article Abstract
Fetal magnetoencephalogram (fMEG) is measured in the presence of a large interference from maternal and fetal magnetocardiograms (mMCG and fMCG). This cardiac interference can be successfully removed by orthogonal projection of the corresponding spatial vectors. However, orthogonal projection redistributes the fMEG signal among channels. Such redistribution can be readily accounted for in the forward solution, and the signal topography can also be corrected. To assure that the correction has been done properly, and also to verify that the measured signal originates from within the fetal head, we have modeled the observed fMEG by two extreme models where the fetal head is assumed to be either electrically transparent or isolated from the abdominal tissue. Based on the measured spontaneous, sharp wave, and flash-evoked fMEG signals, we have concluded that the model of the electrically isolated fetal head is more appropriate for fMEG analysis. We show with the help of this model that the redistribution due to projection was properly corrected, and also, that the measured fMEG is consistent with the known position of the fetal head. The modeling provides additional confidence that the measured signals indeed originate from within the fetal head.
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| http://dx.doi.org/10.1016/j.neuroimage.2003.10.022 | DOI Listing |
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