| 摘要 |
An apparatus for determining the condition of tissue of an epithelium underlying the skin surface using a combination of surface DC electrical measurements and impedance spectroscopy is provided. The apparatus comprises: a first pair of spaced electrodes for applying an electrical signal to the epithelium; a second pair of spaced electrodes for detecting a resulting electrical signal at different points on the epithelium; a means for applying the electrical signal to the first pair of electrodes at several frequencies; a means for measuring the resulting electrical signal at the second pair of electrodes at the frequencies; a means for obtaining a measure of the impedance of a part of the epithelium based on the resulting electrical signal; and a means for obtaining a difference signal representing a change in impedance with frequency.
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