Micro CT投影图像噪声的去除  

Elimination of the Micro CT Projective Image Noise

作　　者：董歌[1,2] 罗守华[1,2] 陈功[1,2] 

机构地区：[1]东南大学生物科学与医学工程学院,南京210096 [2]江苏省中医院信息工程部,南京210029

出　　处：《医疗卫生装备》2009年第2期7-10,共4页Chinese Medical Equipment Journal

基　　金：国家重点基础研究发展计划(973计划)项目(2006CB601200)

摘　　要：目的:研究Micro CT投影图像噪声的去除,提高Micro CT系统重建图像的质量。方法:分析了Micro CT投影图像的噪声形成因素,提出了Micro CT投影图像校正的方法,分别针对随机噪声、暗场、光场、响应不一致和瑕疵像元进行了校正。结果:通过比较研究提出了一种简单实用的实际响应不一致校正,该方法结合了光场、暗电流、增益不一致校正,只一次循环就解决了3种校正,大大提高了算法效率,并通过实验证明了该校正方案的有效性。结论:该方法可有效去除Micro CT投影图像的噪声,提高Micro CT系统重建图像的质量,为后续三维重建等工作奠定良好的基础。Objective To study elimination of the Micro CT projective image noise and improve the quality of the reconstructed image for the Micro CT system. Methods The forming factors of the Micro CT projective image noise were analyzed, and proposed the Micro CT projective image correction method to correct the random noise, dark field, light field, response nonuniformity and defect picture element and eliminate the random noise and the ring artifact respectively. Results Through the comparative study, it proposes a simple and practical correction method for the actual response nonuniformity which combines the corrections of light field, dark current and gain inconsistency and settles the three corrections with one circulation. The method can enhance the algorithm efficiency greatly and the validity of the correction protocol can be proved through experiments. Conclusion The Micro CT projective image noise is eliminated effectively and the good basis for the following work are established such as three-dimensional reconstruction.

关 键 词：MICRO CT投影图像 图像噪声 图像校正 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]