[Dielectric spectroscopy for noninvasive examination of corneal tissue].
Dielectric spectroscopy is a non-invasive contact technique that permits the in vivo measurement of the specific electrical properties of biological tissue induced by an external electrical field. Permittivity, relaxation time and specific conductivity as a function of corneal hydration (wet weight/dry weight) and temperature were measured in 10 porcine corneas. Variation of tissue hydration has a minor influence on the signal, with a significant variation of the signal being detectable only for relatively dry tissue. A much greater influence was found for temperature, in particular on relaxation times. Dielectric spectroscopy provides us with an opportunity to detect structural, in particular temperature-induced, changes in living tissue. In the frequency range investigated, hydration has only a small influence on the dielectric properties of the tissue.
Oltrup
T
T
Universität Augenklinik Tübingen.
Bende
T
T
Kramer
K D
KD
Jean
B
B
D000818:Animals; D003315:Cornea / Q000502:physiology*; D004553:Electric Conductivity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000295:instrumentation*; D013552:Swine; D013696:Temperature; D014882:Water-Electrolyte Balance / Q000502:physiology
Dielektrische Spektroskopie zur nichtinvasiven Untersuchung von Hornhautgewebe.