الفهرس | Only 14 pages are availabe for public view |
Abstract Microwave imaging occupies a notable portion of research interest due to its high sensitivity, being a safe screening technique, cost efficiency, minimal power consumption, and a non-invasive mechanism that can exploited to diagnose the presence of a tumor. In addition to the elimination of breast compression and ionizing radiation and its capability to efficiently distinguish between normal tissues and cancerous tissues in the microwave frequency range. The basic function of the microwave technique is to localize tumors based on the difference between electrical properties such as permittivity and conductivity between healthy and malignant tissues. As demonstrated through the thesis, the microwave imaging system consists of an antenna, breast phantom and an open-source MATLAB program called MERIT toolbox for image reconstruction. The most vital part of the system is how to design a UWB antenna with certain characteristics to have the best performance through the screening process. it was proven that an antenna array is the preferred choice to get the desired characteristics for the best screening process. In this thesis an array of eight elements of antipodal Vivaldi antenna is used for microwave imaging to detect cancerous cells inside the breast phantom with different locations using MERIT toolbox. The proposed system and the image reconstruction algorithm could identify tumors and distinguish between healthy and malignant tissues. The system could also identify small tumor of a radius 10 mm in different locations inside the breast phantom. In the future work, more complicated phantoms with more layers could be implemented to test the system with more than one tumor. Artificial intelligence algorithms could be harnessed in the detection process to increase the accuracy of the proposed system. |