ABSTRACT
Hyperthermia has many problems. One of the most important problems is how to non-invasively measure the temperature of deep-seated cancer and the temperature distribution around it. Electrical characteristics of living tissues are almost the same as those of saline solution. It is well known that the electrical impedance of biological tissues has its specific frequency characteristics. Electrical properties of living tissues have been theoretically and experimentally studied by many researchers. The effective electrical impedance appears at the interface because of the electrochemical reaction. The chapter discusses the error included in the reconstruction images when the initial resistivity distribution over the model is homogeneous. Many researchers have considered impedance computerized tomography as one of the most promising temperature measurement methods. In 1986, D. Gisser and others presented an adaptive current tomography system that provided the best current pattern that applied to the all electrodes simultaneously to distinguish the conductivity distribution of interest.
