Simulation of Dielectric Probe to Study the Basic Parameters in Diagnosis of Skin Cancer by COMSOLMULTYPHYSICS Software

Melanoma is a type of skin censers that is started from melanocyte cells. Conventional methods for diagnosis of cancers include shape, size, and skin tumour colour measurement, the disorder in tumour situation, create scars, bleeding, and touch the site of the injuries. Researches are continuing to find simpler and safer methods in cancer diagnostic.
Methods and Materials: The model was performed in COMSOLMULTYPHYSICS software in axisymmetric method and it includes a metallic circular waveguide, PTFE dielectric rode probe and a skin phantom. Then, transmission and reflection component of electric field, the temperature profile in skin tissue, tissue necrosing and far field radiation pattern were measured in 1 mW and 35 GHz and 95 GHz.
Electric field: we observed that when there isn’t any tissue, the electric field was in transmission mode completely. Moreover, it will be diverged slowly in conical probe tip. On the other hand, reflecting electromagnetic waves were observed when a skin tissue was exposure in media. The necrosis growth rate was investigated in 0, 0.25, 0.5, 1, 2, 5, and 7.5 min respectively. It was observed that all of the tumour regions were irradiated in 7.5 min. when electromagnetic field radiated to skin tissue, cancerous and normal cells had the different colour. The hottest spots indicated the cancerous regions while the temperature was near the 34 C. Far field pattern: This item is extremely dependent on radiated frequency and their patterns are completely different in 35 and 95 GHz frequency.
Discussion and The 35 and 95 GHz millimetre EM wave response watery component is more sensitive than other frequency. In addition, the cancerous skin tissue is wetter than healthy skin. Thus, the application of these waves can be an effective way as a diagnostics method.