摘要
对声波层析成像中的SIRT算法提出了一种加权算法。该改进算法先通过BPT算法得到慢度分布,以之作为SIRT算法的初始值,以空间各点的慢度值与平均慢度值之差作为权系数对SIRT算法中射线矩阵进行加权。算例表明,该改进算法保持了SIRT算法收敛特点的同时,能够加快SIRT算法的收敛速度,提高计算效率,尤其能提高计算精度,是一种可行的加权方法。
A weighted algorithm was put forward for SIRT algorithm of acoustic tomography. Slowness distribution regarded as the initial value was firstly obtained by BPT algorithm. The difference of slowness between each point of space and the average was seen as the weighting coefficient of the ray matrix in the SIRT algorithm. The example shows that the improved algorithm was a feasible weighting algorithm as maintaining the convergence of the SIRT algorithm, speeding up the convergence rate of SIRT algorithm, improving computational efficiency and particularly the accuracy
出处
《青岛大学学报（自然科学版）》
CAS
2011年第2期28-32,共5页
Journal of Qingdao University(Natural Science Edition)
关键词
层析成像
SIRT
反演
加权
computed tomography imaging detection （CT）
SIRT
Inversion algorithm
weighting
