An Application of Electrocardiographic Lead Theory to Impedance Plethysmography

  • Geselowitz D
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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.

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  • David B. Geselowitz

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