TY - GEN
T1 - Pseudo-conductivity inhomogeneous head model for computation of EEG
AU - Wen, Peng
AU - He, Fangpo
AU - Sammut, Karl
PY - 1998
Y1 - 1998
N2 - Human head models for the forward computation of EEG using FEM require a large set of elements to represent the head geometry accurately. Anatomically, the electrical property of each element is different, even though they may represent the same type of tissue (white matter, grey matter, etc.). Since it is impossible to obtain the electrical properties of the cranial tissues for every element in the head model, most algorithms which claim to deal with inhomogeneity can, in reality, only implement the computation for the homogeneous case. This paper presents a new numerical approach which can more precisely model the head by using a set of pseudo conductivity values for the computation of the inhomogeneous case. This set of values are extrapolated from the limited amount of real conductivity values which are available in the literature. Simulation studies, based on both this proposed approach and the homogeneous approach which utilizes mean-valued conductivities, are performed. The studies reveal that the computation results for the potential distribution on the surface of the scalp, obtained using both approaches, are significantly different.
AB - Human head models for the forward computation of EEG using FEM require a large set of elements to represent the head geometry accurately. Anatomically, the electrical property of each element is different, even though they may represent the same type of tissue (white matter, grey matter, etc.). Since it is impossible to obtain the electrical properties of the cranial tissues for every element in the head model, most algorithms which claim to deal with inhomogeneity can, in reality, only implement the computation for the homogeneous case. This paper presents a new numerical approach which can more precisely model the head by using a set of pseudo conductivity values for the computation of the inhomogeneous case. This set of values are extrapolated from the limited amount of real conductivity values which are available in the literature. Simulation studies, based on both this proposed approach and the homogeneous approach which utilizes mean-valued conductivities, are performed. The studies reveal that the computation results for the potential distribution on the surface of the scalp, obtained using both approaches, are significantly different.
UR - http://www.scopus.com/inward/record.url?scp=0032284327&partnerID=8YFLogxK
U2 - 10.1109/IEMBS.1998.747039
DO - 10.1109/IEMBS.1998.747039
M3 - Conference contribution
AN - SCOPUS:0032284327
SN - 0-7803-5164-9
T3 - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
SP - 2167
EP - 2170
BT - Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond
PB - Institute of Electrical and Electronics Engineers
T2 - Proceedings of the 1998 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Part 4 (of 6)
Y2 - 29 October 1998 through 1 November 1998
ER -