The search functionality is under construction.
The search functionality is under construction.

Estimation of Multi-Layer Tissue Conductivities from Non-invasively Measured Bioresistances Using Divided Electrodes

Xueli ZHAO, Yohsuke KINOUCHI, Tadamitsu IRITANI, Tadaoki MORIMOTO, Mieko TAKEUCHI

  • Full Text Views

    0

  • Cite this

Summary :

To estimate inner multi-layer tissue conductivity distribution in a cross section of the local tissue by using bioresistance data measured noninvasively on the surface of the tissue, a measurement method using divided electrodes is proposed, where a current electrode is divided into several parts. The method is evaluated by computer simulations using a three-dimension (3D) model and two two-dimension (2D) models. In this paper, conductivity distributions of the simplified (2D) model are analyzed based on a combination of a finite difference method (FDM) and a steepest descent method (SDM). Simulation results show that conductivity values for skin, fat and muscle layers can be estimated with an error less than 0.1%. Even though different strength random noise is added to measured resistance values, the conductivities are estimated with reasonable precise, e.g., the average error is about 4.25% for 10% noise. The configuration of the divided electrodes are examined in terms of dividing pattern and the size of surrounding guard electrodes to confine and control the input currents from the divided electrodes within a cross sectional area in the tissue.

Publication
IEICE TRANSACTIONS on Information Vol.E85-D No.6 pp.1031-1038
Publication Date
2002/06/01
Publicized
Online ISSN
DOI
Type of Manuscript
PAPER
Category
Medical Engineering

Authors

Keyword