Title :
Effect of measurement noise and electrode density on the spatial resolution of cortical potential distribution with different resistivity values for the skull
Author :
Ryynanen, O.R.M. ; Hyttinen, J.A.K. ; Malmivuo, J.A.
Author_Institution :
Tampere Univ. of Technol.
Abstract :
The purpose of the present theoretical study was to examine the spatial resolution of electroencephalography (EEG) by means of the accuracy of the inverse cortical EEG solution. The study focused on effect of the amount of measurement noise and the number of electrodes on the spatial resolution with different resistivity ratios for the scalp, skull and brain. The results show that if the relative skull resistivity is lower than earlier believed, the spatial resolution of different electrode systems is less sensitive to the measurement noise. Furthermore, there is then also greater advantage to be obtained with high-resolution EEG at realistic noise levels
Keywords :
bioelectric potentials; biomedical electrodes; electroencephalography; medical signal processing; noise; signal resolution; brain; cortical potential distribution; electrode density; electroencephalography; inverse cortical EEG solution; measurement noise; scalp; skull resistivity; spatial resolution; Conductivity; Density measurement; Electrodes; Electroencephalography; Noise level; Noise measurement; Scalp; Signal to noise ratio; Skull; Spatial resolution; High-resolution electroencephalography (EEG); measurement noise; skull resistivity; spatial resolution; spherical head model; Algorithms; Animals; Anisotropy; Artifacts; Brain Mapping; Cerebral Cortex; Computer Simulation; Diagnosis, Computer-Assisted; Electric Conductivity; Electrodes; Electroencephalography; Evoked Potentials; Humans; Models, Neurological; Reproducibility of Results; Scalp; Sensitivity and Specificity; Skull;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.2006.873744
