Investigation Of UWB Microwave Imaging For Early Breadt Tumor Based On Fdtd

Breast cancer is harmful to women’s health, it is one of the primary malignant tumor. Its incidence is on the second place of all the malignant tumor of women and the mortality is increasing year by year. Early breast cancer could be diagnosed which is of great significance to reduce the mortality rate of the patients. At present common imaging technologies for breast cancer have their limitation in some case. In order to overcome the limitation of present common imaging technologies, ultra-wideband microwave imaging detection technology has been proposed. In microwave band, the constant and conductivity of the normal breast tissue and cancer of the dielectric are quite different, this feature has laid a microwave near-field detection of physical basis for breast tumor detection. Near-field microwave detection of breast tumor based on the UWB signal has the advantage of a low-energy electromagnetic radiation signal and carrying a large quantity of information and it can provide mm-level, targeting high-resolution accuracy. It is a great potential technology for early breast cancer detection.In this article, the first three chapters mainly introduce the knowledge of theory, which lay the foundation for later study. The first chapter gives early breast cancer diagnosed for women of great significance firstly, and several currently used methods of breast tumor detection are introduced. Ultra-wideband microwave imaging detection technology has been proposed based on the shortcomings of existing test methods as well as domestic and international developments are introduced. In the second chapter, the structure of breast tissue, the electromagnetic properties of breast tissue are introduced and described the principle of UWB detecting the breast tumor. That is the constant and conductivity of the normal breast tissue and cancer of the dielectric are quite different. Lastly the feasibility of microwave diction was described. In the third chapter, FDTD theoretical has been described and a semi-circular two-dimensional breast models is established. UWB microwave imaging program was presented which is about the early detection of breast cancer. And the appropriate signal for UWB detection is given. The main focus of study is the fourth chapter and the fifth chapter in this article. The fourth chapter counts on the principle of confocal imaging and imaging procedures were introduced, and the specific steps of imaging process are analyzed. The effect of confocal imaging on the UWB near-field is showed based on the FDTD simulation. The ultra-wideband microwave technology for early breast cancer detection is feasible, which is confirmed. In the fifth chapter, the presence specific issues of confocal imaging were discussed. The signal of center frequency, tumor location and the location of emission sources on the imaging effect were studied, and then the improved program was proposed to improve the efficiency of confocal imaging. These provide theoretical basis for clinical medical research.