A WEIGHTED FILTERED BACK PROJECTION ALGORITHM FOR LOG CT TWO-DIMENSIONAL AND THREE-DIMENSIONAL IMAGE RECONSTRUCTION

摘要

Log computer tomography (CT) image reconstruction is the kernel of wood CT non-destructive testing (NDT) technology. In this paper, based on the logs physical properties and the X-rays propagation characteristics in solid, the X-ray wave equation inside logs is deduced. A weighted filtered back projection (FBP) algorithm for log CT image reconstruction is proposed. Four group of logs are chosen for simulations on the weighted FBP algorithm. In the two-dimensional image reconstruction process, the capabilities between conventional FBP algorithm and weighted FBP algorithm are compared to verify the effectiveness of the algorithms for logs of different species. From both the image quality and data results, it can be clearly seen that the weighted FBP algorithm has good performance and advantages for image reconstruction process of log CT scan. The three-dimensional log image reconstruction is well completed, but has a big room for improvement.