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Information extraction and CT reconstruction of liver images based on diffraction enhanced imaging

Progress in Natural Science:Materials International 2009年第8期19卷 955-962页

作者： Chunhong Hua,b, Tao Zhao a, Lu Zhanga, Hui Lia, Xinyan Zhao c, Shuqian Luoa, a College of Biomedical Engineering, Capital Medical University, Beijing 100069, china b national laboratory of pattern recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100080, china c Liver Research Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, china College of Biomedical Engineering Capital Medical University Beijing 100069 China national laboratory of pattern recognition Institute of Automation Chinese Academy of Sciences Beijing 100080 China Liver Research Center Beijing Friendship Hospital Capital Medical University Beijing 100050 China

X-ray phase-contrast imaging (PCI) is a new emerging imaging technique that generates a high spatial resolution and high contrast of biological soft tissues compared to conventional radiography. Herein a biomedical application of diffraction enhanced imaging (DEI) is presented. As one of the PCI methods, DEI derives contrast from many different kinds of sample information, such as the sample’s X-ray absorption, refraction gradient and ultra-small-angle X-ray scattering (USAXS) properties, and the sample information is expressed by three parametric images. Combinedwith computed tomography (CT), DEI-CT can produce 3D volumetric images of the sample and can be used for investigating micro-structures of biomedical samples. Our DEI experiments for liver samples were implemented at the topography station of Beijing Synchrotron Radiation Facility (BSRF). The results show that by using our provided information extraction method and DEI-CT reconstruction approach, the obtained parametric images clearly display the inner structures of liver tissues and the morphology of blood vessels. Furthermore, the reconstructed 3D view of the liver blood vessels exhibits the micro blood vessels whose minimum diameter is on the order of about tens of microns, much better than its conventional CT reconstruction at a millimeter resolution. In conclusion, both the information extraction method and DEI-CT have the potential for use in biomedical micro-structures analysis.

关键词： Diffraction enhanced imaging Computed tomography Information extraction X-ray Liver

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The Lower ReHo of PCC in Resting State in Depression:an fMRI -study

The Lower ReHo of PCC in Resting State in Depression:an fMRI...

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第四届泛亚太地区心理卫生学术研讨会

作者： DaiHui Peng KaiDa Jiang YuFeng Zang XiangYu Long Department of psychiatry Shanghai huashan hospital Fudan university Shanghai 200030 PR china national laboratory of pattern recognition Institute of Automation Chinese Academy of Sciences Beijing 100080 PR china

＜正＞Objective: we maybe test the hypothesis: 1, the KCC of ReHo might be different in testing state between depression and health control in some brain areas.2, Then based on the precious studies of PET and fMRI in depression, the KCC of specific regions such as: PCC in resting state might be abnormal lower in depression by using ReHo method since the cognitive dysfunction in depression. Methods: 16 depressed and 16 age, sex, education grade matched healthy subjects. fMRI scan : resting state, eye closed with no task

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Abnormal regional brain activity in attention deficit hyperactivity disorder as revealed by resting-state functional MRI

Abnormal regional brain activity in attention deficit hypera...

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第一届全国脑与认知科学学术研讨会

作者： Yu-Feng Zaneg Yong He Chao-Zhe Zhu Qing-Jiu Cao Man-Qiu Sui Meng Liang Li-Xia Tian Tian-Zi Jiang Yu-Feng Wang national Key laboratory of Cognitive Neuroscience and Learning Beijing Normal University Beijing 100875 china national laboratory of pattern recognition Institute of Automation Chinese Academy of Sciences Beijing 100080 china Institute of Mental Health Peking University Beijing 100083 china

＜正＞Inattention, impulsivity and hyperactivity are the core symptoms of children with attention deficit hyperactivity disorder （ADHD）. Functional neuroimaging studies have revealed abnormalities in prefrontal-striatal circuit, cerebellum, brain stem and so on. The current study used a new marker of functional MRI （fMRI）, amplitude of low frequency （0.01 - 0.08 Hz） fluctuation （ALFF）, to investigate the baseline brain function of this disorder. Thirteen ADHD boys （12.95±1.36 yrs） and 12 control boys （13.14±0.55 yrs） were examined by resting-state fMRI. Results showed that ADHD subjects exhibited decreased ALFF in the right inferior

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非负矩阵分解在标签语义分析中的应用

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计算机科学 2010年第4期37卷 171-174,191页

作者：张雷鸣李秋丹廖胜才中国科学院自动化研究所复杂系统与智能科学重点实验室北京100190 中国科学院自动化研究所模式识别国家重点实验室北京100190

随着Web2.0技术的发展,社会标注系统日渐流行起来,使得标签在用户收藏的检索和分类管理等方面得到了广泛的应用。然而,由于用户使用标签的自由、非控制性,导致标签在使用上存在冗余和语义模糊性。为了处理该问题,提出一种基于非负矩阵分... 详细信息

随着Web2.0技术的发展,社会标注系统日渐流行起来,使得标签在用户收藏的检索和分类管理等方面得到了广泛的应用。然而,由于用户使用标签的自由、非控制性,导致标签在使用上存在冗余和语义模糊性。为了处理该问题,提出一种基于非负矩阵分解(Non-negative Matrix Factorization,NMF)的标签语义挖掘算法,通过对用户的标注数据进行非负矩阵分解,得到一个包含一系列语义相关标签基的标签子空间,使得同义及相关的标签聚合于同一标签基,且一词多义的标签归类到语义不同的标签基,从而实现标签语义的近义归类和多义辨析。通过大量实验充分展示了提出的算法在标签语义挖掘方面的有效性。

关键词：非负矩阵分解标签标签语义挖掘

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Automatic real-time SLAM relocalization based on a hierarchical bipartite graph model

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Science china(Information Sciences) 2012年第12期55卷 2841-2848页

作者： DONG QiuLei ,GU ZhaoPeng & HU ZhanYi national laboratory of pattern recognition(NLPR),Institute of Automation,Chinese Academy of Sciences,Beijing 100190,china national laboratory of pattern recognition (NLPR) Institute of Automation Chinese Academy of Sciences Beijing China

The need to increase the robustness of a real-time monocular SLAM system raises the important problem of relocalization;namely,how to automatically recover a SLAM system after tracking *** address this problem by proposing a real-time relocalization algorithm based on a hierarchical bipartite graph *** the SLAM system is lost,we use the latter model to find sufficient correspondences between the detected image and stored map features,thus achieving efficient,real-time *** model accounts for both temporal and spatial *** results on both synthetic and real data support the effectiveness of the proposed algorithm.

关键词： monocular SLAM real-time relocalization hierarchical bipartite graph model

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Improved discriminative training for generative model

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The Journal of china Universities of Posts and Telecommunications 2009年第3期16卷 126-130页

作者： WU Ya-hui,GUO Jun,LIU Gang laboratory of pattern recognition and Intelligent System,Beijing University of Posts and Telecommunications,Beijing 100876,china laboratory of pattern recognition and Intelligent System Beijing University of Posts and Telecommunications Beijing 100876 China

This article proposes a model combination method to enhance the discriminability of the generative model. Generative and discriminative models have different optimization objectives and have their own advantages and drawbacks. The method proposed in this article intends to strike a balance between the two models mentioned above. It extracts the discriminative parameter from the generative model and generates a new model based on a multi-model combination. The weight for combining is determined by the ratio of the inter-variance to the intra-variance of the classes. The higher the ratio is, the greater the weight is, and the more discriminative the model will be. Experiments on speech recognition demonstrate that the performance of the new model outperforms the model trained with the traditional generative method.

关键词： model combination discriminability generative model training speech recognition

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PROBABILISTIC ANALYSIS OF GALERKIN-LIKE METHODS FOR THE FREDHOLM EQUATION OF THE SECOND KIND

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Journal of Computational Mathematics 1998年第5期16卷 445-456页

作者： Tian-zi Jiang (School of Mathematics, The University of New South Wales, Sydney 2052, Austmlia national Laborutory of pattern recognition, Institute of Automation,Chinese Academy of Sciences, Beijing 100080, china) 中科院自动化所北京

This paper deals with the approximate solution of the Fredholm equation u TKu = f of the second kind from a probabilistic point of view. With Wiener typemeasures on the set of kernels and free terms we determine statistical features of the approximation process, i.e., the most likely rate of convergence and the dominating individual behavior. The analysis carried out for a kind of Galerkin-like method.

关键词： Probabilistic analysis fredholm equation galerkin-like method abstract wiener space

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THE M/M/c QUEUE WITH PH SYNCHRONOUS VACATIONS

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Systems Science and Mathematical Sciences 2000年第1期13卷 7-16页

作者： TIAN Nai shuo (Department of Mathematics, Yanshan University, Qinhuangdao 066004,china) LI Quan lin (national laboratory of pattern recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100080, china)

***,singleserverqueueswithvacationshavebeenstudiedextensivelyfromtheirowntheoreticalinterestaswellastheirapplicationstomanyengineeringsystemssuchascomputers,***/G/lqueueingsystemswit... 详细信息

***,singleserverqueueswithvacationshavebeenstudiedextensivelyfromtheirowntheoreticalinterestaswellastheirapplicationstomanyengineeringsystemssuchascomputers,***/G/lqueueingsystemswit...

关键词： M/M/c queue synchronous vacation phase type distribution quasi birth and death process matrix-geometric solution.

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A saliency model based on wavelet transform and visual attention

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Science china(Information Sciences) 2010年第4期53卷 738-751页

作者： LI ZhiQiang, FANG Tao* & HUO Hong Institute of Image Processing and pattern recognition, Shanghai Jiaotong University, Shanghai 200240, china Institute of Image Processing and pattern recognition Shanghai Jiaotong University Shanghai China

This paper presents a novel wavelet transform saliency model to detect salient objects. In this model, a saliency map is generated by combining orientation feature maps obtained from wavelet transform of different scale images derived from the same image. Then, the order map of a saliency map is obtained by using Fourier descriptor, which could be used as a guidance to process the most important objects. Experiments indicate that this saliency model is robust to noise and superior to other saliency models in the literature.

关键词： bottom-up attentional mechanism center-surround inhibition phenomenon Fourier descriptor top-down attentional mechanism visual attention wavelet transform

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A new DNA algorithm to solve graph coloring problem

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Progress in Natural Science:Materials International 2007年第6期17卷 733-738页

作者： Jiang Xingpeng1, Li Yin2, Meng Ya3 and Meng Dazhi2(1. national laboratory of pattern recognition,Institute of Automation, Chinese Academy of Sciences, Beijing 100080, china 2. College of Applied Sciences, Beijing University of Technology, Beijing 100022, china 3. School of Science, Beijing Institute of Technology, Beijing 100081, china) national laboratory of pattern recognition Institute of Automation Chinese Academy of Sciences Beijing 100080 China College of Applied Sciences Beijing University of Technology Beijing 100022 China School of Science Beijing Institute of Technology Beijing 100081 China

Using a small quantity of DNA molecules and little experimental time to solve complex problems successfully is a goal of DNA computing. Some NP-hard problems have been solved by DNA computing with lower time complexity than conventional computing. However, this advantage often brings higher space complexity and needs a large number of DNA encoding molecules. One example is graph coloring problem. Current DNA algorithms need exponentially increasing DNA encoding strands with the growing of problem size. Here we propose a new DNA algorithm of graph coloring problem based on the proof of four-color theorem. This algorithm has good properties of needing a relatively small number of operations in polynomial time and needing a small number of DNA encoding molecules (we need only 6R DNA encoding molecules if the number of regions in a graph is R).

关键词： DNA computing NP-hard problem graph coloring problem.

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