The contribution of the lungs to thoracic impedance measurements: A simulation study based on a high resolution finite difference model

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Abstract

A high resolution electrical finite difference model of the human thorax based on a 43 slice MRI data set along with lead field theory was used to examine the contribution of the lungs to the total impedance for a typical mid-thoracic 2D EIT eight and sixteen electrode configuration. Regional analysis of the thoracic sources of impedance revealed that the maximum contribution of lungs to the total impedance was approximately 22% for the eight electrode array and 25% for the sixteen electrode array. Analysis of impedance distribution of the lungs using a mid-thoracic application showed that the contribution of impedance of each slice followed closely the volume of the lungs in the given slice. This suggests that the mid-thoracic application gives results reflecting the entire lung. The contributions of the lung impedance for the various electrode positions showed that the eight electrode configuration had a more smooth change between adjacent electrodes compared to the 16 electrode arrangement.

Original languageEnglish (US)
Article numberS12
Pages (from-to)S153-S161
JournalPhysiological Measurement
Volume28
Issue number7
DOIs
StatePublished - Jul 1 2007

Keywords

  • Bioelectromagnetism
  • Electrode
  • Impedance
  • Lead field
  • Noninvasive

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