摘要
将松弛系数和迭代间像素值约束引入有序子集-最大似然期望算法中,构造出应用于发射CT中的ROSEM算法引入到透射式工业CT中。不仅加快了图像重建的收敛速度而且改善了重建图像的质量。针对ROSEM、代数迭代算法(ART)和卷积反投影算法(CBP),分别做了模拟实验和实际汽车CT检测以及集装箱CT检测实验,并分析比较了它们在60Co集装箱CT检测中的应用。ROSEM算法无论在重建速度还是重建质量上都优于ART算法,其重建图像质量和CBP算法相当。
Relaxation parameters and smooth operations on pixels after each iteration step are introduced into the OSEM algorithm, forming Relaxed OSEM （ROSEM）. Seen from the simulation experiments, ROSEM is superior to OSEM in terms of convergence and image quality. Performances of ROSEM, CBP and ART are analyzed on both Sheep-Logan digital phantom and the ^60Co Container inspection system. ROSEM exceeds ART in both speed and image quality, but exhibits a slower speed than CBP. The speed can be accelerated by look-up table technique as well as the parallel computing technique, so it can be developed as an assistant algorithm in the container inspection system.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2007年第1期45-49,共5页
Nuclear Electronics & Detection Technology
