New method for visualizing three-dimensional electromagnetic power absorption by capsulate liquid crystal dispersed in transparency high-molecular gel phantom

A new method to measure the temperature distribution due to high frequency electromagnetic field (HF-EMF) power absorption is established. It is intend to develop this for SAR measurement from the temperature elevation. A micro-capsulated thermo-tropic liquid crystal (MTLC) is employed as the temperature probe because of its nature of high resolution and high sensitivity. A high-molecular gel phantom with high transparency and viscosity has been made to realize the visualization technique with MTLC. The complex permittivity of the phantom is adjusted to that of muscle at 900 MHz and 1.45 GHz. The efficiency of the method is proved to visualize the HF-EMF power absorption by carrying out an exposure experiment.