An Equivalent Body Surface Charge Model Representing Three-Dimensional Bioelectrical Activity

Bin He, Yuri B. Chernyak, Richard J. Cohen

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

A new surface-source model has been developed to account for the bioelectrical potential on the body surface. A single-layer surface-charge model on the body surface has been developed to equivalently represent bioelectrical sources inside the body. The boundary conditions on the body surface are discussed in relation to the surface-charge in a half-space conductive medium. The equivalent body surface-charge is shown to be proportional to the normal component of the electric field on the body surface just outside the body. The spatial resolution of the equivalent surface-charge distribution appears intermediate between those of the body surface potential distribution and the body surface Laplacian distribution. An analytic relationship between the equivalent surface-charge and the surface Laplacian of the potential was found for a half-space conductive medium. The effects of finite spatial sampling and noise on the reconstruction of the equivalent surface-charge were evaluated by computer simulations. It was found through computer simulations that the reconstruction of the equivalent body surface-charge from the body surface Laplacian distribution is very stable against noise and finite spatial sampling. The present results suggest that the equivalent body surface-charge model may provide an additional insight to our understanding of bioelectric phenomena.

Original languageEnglish (US)
Pages (from-to)637-646
Number of pages10
JournalIEEE Transactions on Biomedical Engineering
Volume42
Issue number7
DOIs
StatePublished - Jul 1995

Bibliographical note

Funding Information:
Manuscript received February 26, 1993; revised March 22, 1995. This work was supported in part by NIH Grant 5ROlHL39291, NASA Grant NAGW-3927, and a grant from The Whitaker Foundation. The work of Y. B. Cbemyak was supported in part by NIH Senior Fellowship 1F33HL08660-01.

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