Measured and expected Cole parameters from electrical impedance tomographic spectroscopy images of the human thorax.
Electrical impedance tomographic spectroscopy (EITS) images have been recorded from a group of 12 normal subjects using frequencies from 9.6 kHz to 1.2 MHz. The impedance changes with frequency have been modelled on a pixel by pixel basis to produce parametric images as a means of characterizing tissue. The modelling was based on the Cole equation. The lungs are seen as areas of high characteristic frequency and low time constants SC and RS. The R/S images are much less uniform over the region of the lungs. Values characterizing the lung and cardiac regions are given. The results appear to be consistent with a model for the lungs whereby the model parameters can be related to alveolar structure and composition.
Department of Medical Physics and Clinical Engineering, University of Sheffield, Royal Hallamshire Hospital, UK.
B H
BH
Brown
A D
AD
Leathard
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L
Lu
W
W
Wang
A
A
Hampshire
D000328:Adult; D001823:Body Composition / Q000502:physiology*; D017097:Electric Impedance; D004566:Electrodes; D005260:Female; D006321:Heart / Q000502:physiology; D006801:Humans; D008168:Lung / Q000502:physiology; D008297:Male; D008875:Middle Aged; D011650:Pulmonary Alveoli / Q000502:physiology; D013909:Thorax / Q000502:physiology*; D014054:Tomography / Q000706:statistics & numerical data*