基于差分图校正环状伪影的自动阈值选取研究  

Research on Automatic Threshold Selection in Ring Artifact Correction Based on Differential Figure

作　　者：王海浪[1] 

机构地区：[1]东南大学,生物医学工程南京210096

出　　处：《现代计算机》2014年第6期49-52,61,共5页Modern Computer

摘　　要：CT图像环状伪影是影响CT图像质量的重要伪影之一。在重建图像基础上使用低通滤波减除环状伪影是环状伪影校正方法中的主要手段。而在这个过程中通过阈值隔断差值图中的边界信息是直接影响校正结果的重要操作。通过模拟数据的研究,提出一种自动选取阈值的新方法,并在实际CT数据中进行验证。该方法在保证图像细节分辨率的情况下环状伪影得到有效抑制,图像质量获得显著提高。Ring artifact is one of the important artifacts affect CT image quality. Using low pass filter to reduce ring artifact based on reconstruction image is the main tool in correction methods. Cutting off the boundary information in difference image by a threshold will effect the cor-rect result directly. Presents a new method of selecting threshold automatically based on the study of simulated data, and verifies it in ac-tual CT data. Ring artifact has been effectively suppressed under the circumstance to ensure image detail resolution, image quality is sig-nificantly improved.

关 键 词：环状伪影 低通滤波 自动阈值选取 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TH774[自动化与计算机技术—计算机科学与技术]