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ART-TVp中p值对CT 图像重建效果影响研究

发表时间:2016-08-31  浏览量:1234  下载量:379
全部作者: 喻春雨,孙京阳,缪亚健
作者单位: 南京邮电大学光电工程学院
摘 要: 以shepp-logan 计算机断层扫描成像(computed tomography,CT)图像重建模型为研究对象,首先采集不完全投影数据,分无噪声和含噪声两种情况运行采用总变差(total variation,TV)Lp 范数最小化进行代数迭代(algebraic reconstruction technique,ART)的ART-TVp 图像重建算法,分析范数中p 取值对图像重建效果的影响,得出最佳p 取值;然后以真实医学CT 图像为研究对象,以ART-TVp 算法与ART 和滤波反投影(filtered-back projection,FBP)两种常用算法进行重建图像效果对比。结论:p 取值在[0.4,0.6]时,ART-TVp重建图像与原图像差异最小,特别在p=0.5 时重建效果最好;ART-TVp 算法在p=0.5 时,重建效果好于传统图像重建算法;ART-TVp 算法可对完全投影数据和不完全投影数据进行图像重建,以不完全投影数据重建可以降低运算时间和射线辐射。
关 键 词: 图像处理;图像重建;范数;总变差最小化;图像质量;图像噪声
Title: Selection of p using ART-TVp on CT image reconstruction
Author: YU Chunyu, SUN Jingyang, MIAO Yajian
Organization: School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Abstract: Algebraic reconstruction technique (ART)-TVp based image reconstruction, using either full projections or partly projections, is studied. All projections data for image reconstruction is from the shepp-logan phantom. The p value can affect the image quality of the image reconstruction and p=0.5 is found to be the best value for ART-TVp image reconstruction. Then ART-TVp setting p=0.5 is compared with the other two traditional algorithms, filtered-back projection (FBP) and ART, on a computered tomography (CT) medical image reconstruction. Conclusions are ART-TVp is superior for it can reconstruct CT image from both full projections and partly projections, especially when p=0.5, its reconstructed image is with higher quality than FBP and ART.
Key words: image processing; image reconstruction; norm; total variance; image quality; image noise
发表期数: 2016年8月第16期
引用格式: 喻春雨,孙京阳,缪亚健. ART-TVp中p值对CT 图像重建效果影响研究[J]. 中国科技论文在线精品论文,2016,9(16):1705-1711.
 
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