ID 110744
Author
Ohmine, Yuken Department of Surgery, Awa Hospital Tokushima Prefectural Welfare Federation on Agricaltural Cooperative
Morimoto, Tadaoki Department of Adult and Gerontological Nursing, School of Health Sciences, The University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Kinouchi, Yohsuke Department of Electrical and Electronic Engineering, Faculty of Engineering, The University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Iritani, Tadamitsu Department of Electrical and Electronic Engineering, Faculty of Engineering, The University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Takeuchi, Mieko Department of Maternal and Pediatric Nursing, School of Health Sciences, The University of Tokushima Tokushima University Educator and Researcher Directory
Haku, Mari Department of Maternal and Pediatric Nursing, School of Health Sciences, The University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Nishitani, Hiromu Department of Radiology, Institute of Health Biosciences The University of Tokushima Graduate School Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Keywords
electrical bio-impedance
electrical conductivity
measurement
non-invasive electrode
soft tissue
Content Type
Journal Article
Description
The purposes of this study were to estimate the electrical conductivity of tissues by non-invasively measuring the electrical bio-impedance, to develop a new method for tissue diagnosis, i.e., electrical impedance tomography (EIT). Tissue models were first designed taking into consideration the distribution of the fat tissue, muscle and bone in the human forearm, and then the intra-tissue distributions of electrical potential and field, and the electrical impedance in the models was theoretically analyzed by the three-dimensional finite element method. The electrical impedance of both forearms was measured in healthy human subjects, and estimated the electrical conductivity of individual local tissues. The results of the analysis showed that the distributions of electrical potential and field were affected by the presence of fat tissue but not by the presence or absence of bone. In addition, as a result of calculation of the electrical resistance of the extracellular fluid (Re) in each model, it was found that the value of bio-impedance was influenced by the presence of fat tissue, and the value of bio-impedance was increased by the intervention of a fat layer.
The electrical conductivity estimated by fitting the observed values to the values obtained by finite element analysis was 0.40 S/m and 0.15 S/m for male muscle and fat tissue, and 0.35 S/m and 0.11 S/m for female muscle and fat tissue, respectively. The sex difference in the slope of linear approximation in the estimation of electrical conductivity of the males and females was thought to be due to sex differences in the properties and structure of fat tissue. These results suggest that local tissues can be diagnosed differentially and electrically by percutaneous measurement of local bio-impedance and subsequent estimation of the electrical conductivity of each tissue.
Journal Title
The journal of medical investigation : JMI
ISSN
13431420
NCID
AA11166929
Volume
51
Issue
3-4
Start Page
218
End Page
225
Sort Key
218
Published Date
2004-08
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Medical Sciences
Science and Technology