چكيده به لاتين
Cancer is predicted to be the main cause of death worldwide. Three techniques are mainly used for treatment of brain cancer tumor depending on surgery, chemotherapy, and radiotherapy. Each of these techniques is associated with its own drawbacks. A new tool is emerging based on microwave hyperthermia treatment as a reliable treatment method can address the limitations and side effects associated with the currently used treatment modalities. During hyperthermia treatment, the temperature of the tumor is raised to 40–45°C for the purpose of damaging or destroying cancer cells without effecting of healthy tissue.
These systems lead to cell destruction of tumor cells exposed to tempratures higher than and provide a comfortable treatment envoirment by applying heat to the tumor cells alone without surgical incisions or damage to normal tissues. To improve the treatment effect of hyperthermia systems, the heat must be focused exactly at the therapeutic target, and the thermal effect should be controlled to minimize damage to normal cells.
In this thesis, first, history of cancer cells destruction and then introducing principles such as hyperthermia systems, SAR and ETA is presented.
In chapter two, various types of electromagnetic lenses with hyperthermia application is defined.
In chapters three and four, two methods of Transmit – Array Near – Field lens design for deap – seated tumors treatment in human body is analyzed. These lenses focus electromagnetic energy in desired focal point and tumor is destroyed after desired spot temperature elevation during specified time.
First method is based on transmit – array lens with two bolous water layer. Related lens includes capacitance and inductance layers and phase shift of each unit cells located on lens shall be designed in such a way that transmitted rays from lens to be focused in desired focal point in an equiphased form.
Second method is based on a regional dielecric lens that each regions on lens contain exclusive dielectric constants. Finally, this lens will be deisgned and its related dielectric constants will be specified in such a way that after incidence of electromagntec waves to lens’s surface by a dipole antenna or a patch antenna, electromagnetic energy to be focused in desired spot point.
