Research On Imaging Technology Based On Space-time Beam Forming

Breast cancer is a sarcomata disease which is harmful to the health of women. Itsdeath rate is on the first place of all the women died of malignant tumor. The diagnosisof breast cancer at its early stage will lead to longest survival and reduce the breastcancer mortality significantly. So technologies for early breast cancer detection havebeen eagerly desired for years. In the microwave frequency band, there are distinctdifferences about electromagnetic properties between normal breast tissues andmalignant tumor. The differences are the physics foundation for microwave breastnear-field detection. Ultra Wide Band microwave Near-Field Breast Tumor DetectionTechnology has the excellent features of:(1) Low radiation energy of electromagneticsignal;(2) Large account of objective carrier information token by Impulse;(3) Highresolution and Millimeter level accuracy of location.Based on the2D and3D model of breast, by using the finite difference timedomain method (FDTD), this paper discusses the application of ultra-wide bandmicrowave beam forming technique in early breast cancer detection. Two2D models ofbreast are firstly demonstrated: single tumor and multiple tumors. The field distributionwithin the scanning region is obtained by using FDTD method and the microwaveimaging algorithm is used to study the imaging of early stage breast cancer. It uses asingle antenna of different location for multiple imaging, and the images of multiplelocations are superimposed, so as to achieve the purpose of tumor detection. From theresults it can be found that using this scheme can effectively detect early breast tumor.The viability of ultra-wide band microwave using in tumor detection is proved. Next,constructing the3D model of breast, it discusses the scheme of tumor imaging solutionsusing the3D model. The location information can be detected without reference to themodel of breast without tumor.