Mechanisms:

The mechanism of electrical conduction in biological tissues (both in living and also in lifeless tissue) is very complicated and has to the present day not been fully understood. The typical characteristic of the process is the forced ionic transport. It is the most important process in the treatment of cancer in order to irrevocably damage the malignant tissue (Galvanic process).

Resistance Effects:

The resistance depends to a significant extent on the geometric circumstances and on the material in which the current flows. In a living body, this creates a problematical situation with respect to the measurement because active currents are not characteristic for the tissue. At the same time, a series of mixed effects come about. They are the reason why experiments regarding the identification of special tissue effects have been begun and why the results have separated from geornetic research.

A method has been developed which is successful both from a diagnostic and also from a therapeutic point of view. The parameters which are actually required for the application are the characteristic resistance information of the resistances measured at various electrode depths. If the depth is x, we obtain the resistance in form of a third degree polynom:

R(x) = Ro + R1X + 2X 2+ R3×3

In this way, we obtain the constants as a result. Based on this information, we can separate the geometric parameters of the penetrating electrodes and measure the resistances of the point of the needle and the needle casing.