Abstract
The final purpose of this study is to accomplish the non-invasive imaging system of temperature-change distribution in the human head. The human tissue can be generally expressed with electrical resistance and capacitance. Capacitance is related to permittivity with temperature characteristic. In our method, capacitance is measured by many small electrodes arranged in surface of the human head. Using their values, permittivity distribution is reconstructed, and then, the distribution is replaced to temperature-change distribution using the permittivity-temperature characteristic.
In our previous study, a new capacitance measurement method was proposed and inhomogeneous permittivity distribution of brain phantom inserted agar-agar was reconstructed using the regularization method based on the modified Newton-Raphson method.
In this paper, the reconstruction of temperature-change distribution in the brain phantom is demonstrated when temperature of brain phantom is actually changed. As results, although the improvement in the measurement system and reconstruction algorithm is needed, the pattern of temperature-change could be presented. Therefore, the realization of the imaging of the temperature-change distribution in the brain phantom by means of this proposed capacitance measurement is expected.
