Bh. Brown et al., MEASURED AND EXPECTED COLE PARAMETERS FROM ELECTRICAL-IMPEDANCE TOMOGRAPHIC SPECTROSCOPY IMAGES OF THE HUMAN THORAX, Physiological measurement, 16, 1995, pp. 57-67
Electrical impedance tomographic spectroscopy (Errs) 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 modell
ed on a pixel by pixel basis to produce parametric images as a means o
f 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 th
e region of the lungs. Values characterizing the lung and cardiac regi
ons are given. The results appear to be consistent with a model for th
e lungs whereby the model parameters can be related to alveolar struct
ure and composition.