中国体视学与图像分析杂志
Chinese Journal of Stereology and Image Analysis 중국체시학여도상분석
- 主管单位： 中国科学技术协会
- 主办单位： 中国体视学学会
- 影响因子： 0.29
- 审稿时间： 1-3个月
- 国际刊号： 1007-1482
- 国内刊号： 11-3739/R
- 论文标题 期刊级别 审稿状态
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图像重建迭代算法的一种改进
根据射线穿过不同密度的物质产生的衰减不同,可以重建出物体的CT图像.为了提高重建图像的精度,需要考虑射线穿过空气时所产生衰减,将其近似为一个常数,由此建立线性回归模型,给出相应的迭代算法,并通过实验进一步验证算法的有效性.
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过程层析成像概述
过程成像是近年来发展起来的一种两相流/多相流测量技术,其特点是以非破坏方式获得被测目标体内部多相流体的运动状态,可为动态过程建模和在线控制提供理论和技术依据.本文以电容成像为例介绍了过程成像的原理,方法及其应用;指出了已有图像重建算法的不足.文中简述了作者提出的广义逆敏感矩阵方法的基本思路和实验结果.后从系统的角度提出了需要解决的关键科学问题.
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双弧源轨迹锥束CT的三维图像重建
In this paper, we review the general theory and algorithms that have proposed for image reconstruction from cone-beam data for general trajectories with kinks. The reconstruction algorithms include the backprojection filtration (BPF) algorithm and the minimum-data filteredbackprojection (MD-FBP) algorithm. One of the unique features of these new algorithms is that they can reconstruct exactly images within regions of interest (ROIs) from data containing truncations. In this work, we also apply these algorithms to reconstructing ROI images from truncated data acquired with a trajectory consisting of two pieces of arcs, which is referred to as the arc-arc trajectory. The numerical results in these studies show that exact ROI images can be reconstructed by use of the BPF and MD-FBP algorithms from truncated data acquired with an arc-arc trajectory.
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基于PC机的大规模体数据场实时可视化
为了能够快速可视化大规模体数据场,以往的研究主要集中在基于高端图形工作站和计算机集群上的并行算法.近年来个人计算机的性能大幅提高,特别是可编程图形硬件飞速发展,利用PC机可视化大规模体数据场成为可能.本文探讨了基于PC机可视化大规模体数据场的可行性,总结了体绘制软件和硬件加速算法,特别是基于可编程图形硬件的体绘制加速算法,并指出了进一步的研究方向,为十亿字节以上的大规模体数据场的实时高质量可视化提供了一个可借鉴的解决方案.
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另一种基于弦的锥束CT图像重建的推导方法
Recently, we have developed a new formula for cone-beam CT image reconstruction. From the formula, we have also derived three algorithms. Two of the algorithms, which are referred to as the back-projection filtration (BPF) and minimum-data filtered backprojection (MD-FBP) algorithms, can provide volume images from projection data with a minimal scanning arc and minimal irradiation per view angle. The fact that these reconstruction algorithms allow for minimum irradiation per view is unique to the BPF and MD-FBP algorithms. This article explores the mathematical relationship between the projection data and an intermediate back-projection image necessary for obtaining the actual volume image. An alternative proof of the formula and the BPF algorithm are also provided.
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基于ICT断层扫描图像的逆向工程功能设计
本文开发设计了一套基于ICT断层切描图像的逆向工程软件平台.运用图像图形处理中的边缘检测、阈值分割、边界细化、矢量化及格式转换等算法与技术,实现工件由三维断层ICT数据到快速成型机STL接口及CAD图纸再编辑的功能.所设计的软件功能齐全,层次清晰,具有较高实用性.
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工业过程断层图像的三维动态可视化
提出了一种针对工业过程断层图像的三维动态可视化方法,可用于对工业过程的辅助监控.该方法采用基于光线投射的体可视化技术,已在MITK(Medical Imaging ToolKit,一个用于医学影像处理与分析的C++类库)中实现.该方法使用不同的颜色和阻光度系数来区分反应容器或管道中的不同物质,从而为容器或管道中不同物质的混合反应过程提供一个动态的显示.实验结果证明该方法是可行的,并且其性能也是可接受的,若再辅之以体绘制算法的硬件加速,该方法可用于实时的工业断层成像系统中.
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一种实用的二维工业CT重建算法
Computed tomography plays an important role in industrial non-destructive testing, medical applications, astronomy and many other fields to look inside the scanned object and to analysis its inner structures. A non-destructive testing software have been developed to efficiently detect inner flaws of space industrial components. As the core of our software, reconstruction algorithms including preprocess of raw data, re-arrange algorithm and filtered back-projection algorithms have been described in detail in this article. With real raw data from CASC of China, experimental results verified the applied reconstruction algorithm in our software. Furthermore, forward algorithms simulating generation of fan-beam raw data are also presented in this article.
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满三维图像重建的卷积反投影算法
本文用构造δ序列的方法,给出了一种n维Radon变换反演的卷积反投影算法,证明了该算法在图像的连续点收敛于原图像,当n=2时,就是广泛用于图像重建的卷积反投影算法,由此也给出了卷积反投影方法收敛性的另一种推导.当n=3时,是新的满三维重建的卷积反投影算法,由于三维反演公式具有局部性,该算法对研究三维局部重建有启示.并基于三维情形,利用模拟数据进行了数值仿真,说明该算法是一种有效的三维图像重建算法.
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鞍形CT的感兴趣区图像重建
Recently, we have developed a general formula for 3D cone-beam CT reconstruction, which can accommondate general, smooth trajectories. From the formula, algorithms can be derived for image reconstruction within a region of interest (ROI) from truncated data. In this work, we apply the derived backprojection filteration (BPF) algorithm and the minimum-data filtered backprojection (MD-FBP) algorithm to reconstructing ROI images from cone-beam projection data acquired with a saddle trajec-tory. Our numerical results in these studies demonstrate that the BPF and MD-FBP algorithms can accurately reconstruct ROI images from truncated data.
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锥束覆盖方法的并行实现及性能分析
三维螺旋锥束CT重建算法的快速实现是CT理论与实际应用中关注的焦点.本文基于锥束覆盖方法[1]对Katsevich精确反演公式设计了并行算法并给出了算法的并行性能分析.从本文的结果可以看出,该算法是解决三维螺旋锥束CT的重建算法时效性的一个可行途径.
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新的超分辨CT扫描模式和图像重建方法
针对通常工业CT转台特点,提出了一种新的基于扇束等距采样的超分辨CT扫描模式和相应的重建算法.分别向左和右偏移CT旋转中心1/4探测器宽度,得到的两组相叠采样的投影数据.通过求解一组具有双对角矩阵的线性方程组,得到高分辨的CT虚拟投影数据,进而由扇束滤波反投影算法重建出高分辨的CT图像.数值模拟结果验证了本文方法的有效性.
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在锥束CT中基于弦的边缘图像重建
In this work, we demonstrate that the theory of cone-beam tomography image reconstruction on chords can be modified for use with local tomography problems. Our analysis reveals that discontinuities in the profiles of the object function along chords can be reconstructed readily. By consideration of all possible chords, an image that de-scribes the location of boundaries within an object can be reconstructed. A preliminary numerical study is conducted to validate and demonstrate the reconstruction method.
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小动物正电子断层扫描仪(Micro-PET)技术概述
概述基于临床PET技术发展起来的Micro-PET(micro Positron emission tomography).它可以实现对小动物的活体扫描和定量分析,从而取代传统的解剖大量动物进行实验的方法.它具有空间分辨率高、体积小、造价低等优点,在疾病诊断、药物研究以及基因工程等领域有着广泛的应用前景.国内已有单位(中科院高能所)从事Micro-PET的研发.
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虚拟内窥镜中漫游路径的获取
漫游路径提取和碰撞检测是复杂环境下虚拟漫游的两个重要难题,尤其在人体器官中的虚拟内窥漫游.我们通过结合保持物体形状的骨架和内部点到边界的距离解决了上述两个难题.综合了距离变换和拓补细化,本文提出了包含距离信息的中心线提取算法.该算法可以有效的提取出管状物体的单体素连接的中心线并能记录中心线到删除层的距离.骨架上的杂枝也可通过距离阈值和长度阈值予以删除.此外,我们还结合了直线模拟来光滑骨架.实验结果表面该算法得到的骨架能够很好地表示复杂的管状物体并能有效的指导漫游.
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