Title :
An Application of Electrocardiographic Lead Theory to Impedance Plethysmography
Author :
Geselowitz, David B.
Author_Institution :
Department of Biomedical Engineering, Moore School of Electrical Engineering, Philadelphia, Pa., and the Department of Medicine, School of Medicine, University of Pennsylvania, Philadelphia, Pa. 19104.
Abstract :
The change in mutual impedance ¿Z resulting from a change ¿g in the conductivity of a particular region of a volume conductor is shown to be given by ¿Z = - ¿g¿Lt¿·L¿ dv. L¿ and L¿ are the lead fields associated with the two ports used to measure ¿Z. The integration is over the region where the conductivity has changed. The superscript t indicates that the lead field is to be evaluated following the change in conductivity. An example involving a spherical conductor is provided.
Keywords :
Conductivity; Conductors; Current density; Equations; Impedance measurement; Insulation; Plethysmography; Resistors; Surface impedance; Voltage; Biomedical Engineering;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.1971.4502787
