本文介绍了一种收、发天线分离的乳腺癌超宽带微波检测方案；并回顾了传统的乳腺癌检测方法。在文中简单探讨了超宽带信号的特性和天线的选择；用时域有限差分法对该方案进行了仿真，采用共焦成像算法得到的结果表明，该方法可以探测到10mm以下的乳房肿瘤。在图像重建中，最主要的部分是信号的处理和能量计算。本文主要探讨了信号处理中的时延计算和时延补偿问题。在肿瘤位置时延补偿后的信号能够同相叠加，能量相对较强。经过计算表明,准确的计算信号时延并对信号进行时延回推后，能够准确地实现图像重建。

 

 

关键字: 超宽带,乳腺癌,微波成像,FDTD,时延

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

An ultra-wideband (UWB) microwave imaging scheme with transmitting and receiving antennas separated was investigated by using finite difference time domain method (FDTD);and looked back the traditional breast tumor imaging method .In this text, I did simple introduction to the characteristic of the ultra-wideband signal and the  antennas. The imaging results by using the confocal imaging algorithm shows that the approach can detect early breast cancer of diameter smaller than 10mm. In imaging rebuilt, the two important parts are signal processing and the signal energy computing. In this thesis we mainly discussed the method used to compute  the lazy evaluation of each antenna when ultra-wideband signals reflected from breast tumor. And at the end of this thesis, the tumor’s 3D picture in the breast model was given. As we demo in this thesis ,if compute the time delay accurately, we can rebuild the imaging correctly.

 

 

 

Key words: Ultra-wideband ,Breast tumor ,Microwave imaging ,FDTD，Time delay