زهرا فيضي

Cancer is a complex and deadly disease, and early detection plays a very important role in increasing the survival rate of patients. There are various methods for diagnosing cancer, but many of these methods have limitations such as low sensitivity, high cost, or the need for complex equipment. In this thesis, the design and construction of microwave sensors for cancer detection are discussed. Microwave sensors are considered as a new and efficient tool for cancer detection due to their features such as high tissue penetration, high sensitivity to changes in the electrical properties of tissues, and fast data processing capability. In this research, the physical and functional principles of microwave sensors are first examined, and then the optimal design of these sensors is carried out based on electromagnetic simulations. In the next step, laboratory samples are made and experiments are conducted to eva‎luate their accuracy and efficiency in detecting cancerous tissues compared to healthy tissues. In this study, a new concept for implementing a sensor system for skin cancer detection by measuring the skin dielectric constant (rε) is presented. The research path begins by showing that the real and imaginary dielectric constant components can be measured accurately. Considering that the permeability of the skin in individuals may vary due to factors such as age and gender, the resonator structure is presented using a comparative method. Using this method, there is no need to know the exact value of the dielectric coefficient and the difference between the two parts is automatically detected by comparing two separate skin areas. The designed system operates in two modes of resonance frequency comparison and signal amplitude comparison. The results of this research show that the introduced system has high accuracy and the ability to detect cancerous lesions at different depths of the skin due to the selection of microwave frequency and the comparative process in detection. This system is designed at a frequency of 3 to 10.5 GHz and has a sensitivity of 85 MHz⁄RIU, a quality factor of 465 and a criterion A figure of merit of 39525〖RIU〗^(-1) was obtained for the system. This increased sensitivity is crucial for early detection of skin cancer and allows for more accurate diagnosis based on subtle differences in permeability between healthy and damaged skin areas. Also, comparison of the results with traditional methods such as biopsy and medical imaging indicates the high potential of this type of sensor in non-invasive and rapid cancer diagnosis. Ultimately, these sensors can be used as a low-cost and rapid tool for early detection of cancers in the early stages and help improve the quality of medical care.

حسگرمايكروويو , بيو سنسور , تشخيص سرطان , سرطان پوست , عمق نفوذ ميدان الكتريكي , كاربرد امواج الكترومغناطيسي در تشخيص

Microwave sensor , Biosensor , Cancer detection , Skin cancer , Electric field penetration depth , Application of electromagnetic waves in diagnosis

Zahra Feizy

Ali Abdolali