ADI-FDTD方法在乳腺癌检测正向计算中的应用  

Application of ADI-FDTD method in the forward solver of early breast cancer detection

作　　者：陈碧云[1] 张业荣[1] 潘鑫[2] 

机构地区：[1]南京邮电大学电子科学与工程学院,南京210003 [2]空军航空大学,阜新123000

出　　处：《电波科学学报》2016年第5期1016-1022,共7页Chinese Journal of Radio Science

摘　　要：传统的时域有限差分(Finite-Difference Time-Domain,FDTD)算法受到稳定性条件的制约,时间步长受限于空间网格的尺寸.医学应用讲究即时性,为提高成像的速度,文中采用无条件稳定的交替隐式时域有限差分(Alternating-Direction Implicit Finite-Difference Time-Domain,ADI-FDTD)算法替代传统的FDTD算法进行正向计算,通过实验得出采用ADI-FDTD算法在保证精度的前提下,计算时间可缩短为FDTD算法的四分之一,为乳腺癌微波即时成像提供了可能.In the conventional finite-difference time-domain （FDTD）method,fine cells reduce the time-step size due to the Courant-Friedrich-Levy（CFL）stability condition,which results in an increase in computational effort,such as the central processing unit （CPU）time.In the alternating-direction implicit finite-difference time-domain（ADI-FDTD）method,a larger time-step size than allowed by the CFL stabili-ty condition limitation can be set because the algorithm of this method is unconditionally stable.Conse-quently,an increase in computational efforts caused by fine cells can be prevented.The simulation experi-ments data by the ADI-FDTD method were compared with that by the conventional FDTD method.The results show that simulation field by ADI-FDTD method agree quite well with that by the FDTD method, but the required CPU time can be much shorter than that for the FDTD method.

关 键 词：交替隐式时域有限差分法 微波断层成像 乳腺癌 

分 类 号：TN011[电子电信—物理电子学]