Title :
Investigating the measurement capability of densely-distributed subdermal EEG electrodes
Author :
Subramaniyam, Narayan Puthanmadam ; Wendel, Katrina ; Joutsen, Atte ; Hyttinen, Jari
Author_Institution :
Dept. of Biomed. Eng., Tampere Univ. of Technol., Tampere, Finland
Abstract :
This paper studies the effect of bipolar subdermal EEG lead placement on measurement sensitivity distributions. The electrodes were subdermally located on the skull of a realistic human head and arranged in a 5×5 matrix of electrodes located at the apex of the cranial vault. The effects on the measurement sensitivity were studied by means of the half-sensitivity volume (HSV). The results indicate that subdermal measurements focus the accuracy and specificity of EEG measurement; however, the size of the half sensitivity volume varies due to electrode location across one or more gyri, gray matter and cerebrospinal fluid (CSF) thickness. The results of the study suggest that subdermal needle electrodes could provide specific and accurate measurements of cortical activation but warrant further studies to understand how much the measurement sensitivity is influenced by placement of the subdermal electrodes over the gyri versus sulci.
Keywords :
biomedical electrodes; biomedical measurement; electroencephalography; CSF; HSV; cerebrospinal fluid; cranial vault; gray matter; gyri; half-sensitivity volume; human head; measurement sensitivity; skull; subdermal EEG electrodes; Electric potential; Electrodes; Electroencephalography; Lead; Sensitivity; Volume measurement;
Conference_Titel :
Noninvasive Functional Source Imaging of the Brain and Heart & 2011 8th International Conference on Bioelectromagnetism (NFSI & ICBEM), 2011 8th International Symposium on
Conference_Location :
Banff, AB
Print_ISBN :
978-1-4244-8282-5
DOI :
10.1109/NFSI.2011.5936830