摘要
伪影是不能正确反映试样内部结构的那部分图像,为了减少对图像的误判断,通常将伪影作为一种干扰进行校正。边界伪影是与CT图像重构算法有关的一种系统误差,但却包含了试样的边界信息。基于射线成像常用算法,分析了CT边界伪影的特征和产生机制。研究表明,边界伪影中CT数极大值位置与试样的边界有一定的关系,对边界伪影的研究有助于准确判断试样在图像中的位置,推算试样的几何尺度。
An artifact is usually regarded as a measure error, but the boundary artifact is an exception, which occurs in the interface between two different media. As a kind of systematic errors caused by reconstruction algorithm of CT images, the boundary artifact contains some information of the sample size. Based on conventional back-projection reconstruction algorithm of CT image, the mechanism of CT boundary artifacts is analyzed. The study shows that the sample boundary is in correspondence with the position of CT boundary artifact maximum and the study on boundary artifact is beneficial to correctly judge the position of sample in CT image and evaluate the geometrical dimension of sample.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第6期1198-1203,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
岩士力学
CT图像
边界伪影
重构算法
试样尺度
rock and soil mechanics
computerized tomography image
boundary artifact
reconstruction algorithm
sample size
