Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162)最新文献

A new variational shape-from-orientation approach to correcting intensity inhomogeneities in MR images 一种新的变分形状定向校正MR图像强度不均匀性的方法

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692393

S. Lai, M. Fang

{"title":"A new variational shape-from-orientation approach to correcting intensity inhomogeneities in MR images","authors":"S. Lai, M. Fang","doi":"10.1109/BIA.1998.692393","DOIUrl":"https://doi.org/10.1109/BIA.1998.692393","url":null,"abstract":"A new algorithm based on shape from orientation formulation in a regularization framework is proposed for correcting intensity inhomogeneities in MR images. Unlike most previous methods, this algorithm is fully automatic and very efficient. In addition, it can be applied to a wide variety of images since no prior classification knowledge is assumed. In this algorithm, the authors use a finite element basis to represent the bias field function. Orientation constraints are computed at the nodes of the finite element discretization away from the boundary between different regions. The selection of reliable orientation constraints is facilitated by the goodness of fitting a first-order polynomial model to the neighborhood of each nodal location. The selected orientation constraints are integrated in a regularization framework, which leads to the minimization of a convex and quadratic energy function. This energy minimization is achieved by solving a linear system with a large, sparse, symmetric and positive semi-definite stiffness matrix. The authors employ an adaptive preconditioned conjugate gradient algorithm to solve the linear system efficiently. Experimental results on a variety of MR images are given to demonstrate the effectiveness and efficiency of the proposed algorithm.","PeriodicalId":261632,"journal":{"name":"Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127330612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Forward deformation of PET volumes using material constraints 使用材料约束的PET体积正向变形

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692394

G. Klein

引用次数: 7

Joint reconstruction of 2-D left ventricular displacement and contours from tagged magnetic resonance images using Markov random field edge prior 利用马尔科夫随机场边缘先验对标记磁共振图像进行二维左心室位移和轮廓联合重建

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692408

L. Yan, T. Denney

引用次数: 3

Singularities and the features of deformation grids [brain images analysis] 变形网格的奇异性与特征[脑图像分析]

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692392

F. Bookstein

引用次数: 5

Real-time tracking of contrast bolus propagation in X-ray peripheral angiography x线周围血管造影造影剂传播的实时跟踪

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692440

Zhenyu Wu, J. Qian

{"title":"Real-time tracking of contrast bolus propagation in X-ray peripheral angiography","authors":"Zhenyu Wu, J. Qian","doi":"10.1109/BIA.1998.692440","DOIUrl":"https://doi.org/10.1109/BIA.1998.692440","url":null,"abstract":"This paper describes a robust and fast algorithm for real-time tracking of contrast bolus propagation in vessels during X-ray peripheral angiography studies, in which the authors are interested in imaging the arterial structures in the legs. A bolus of contrast medium is injected to the patient and a time-sequence of X-ray images records the bolus propagation. Since the field of view of the imaging device is small compared to the object length, the device has to step through an number of preset stations to follow the bolus. Currently it requires a physician to manually issue stepping commands according to his/her visual assessment of bolus propagation observed in a monitor. A smart data acquisition technology is being developed to replace this error-prone manual process in which the bolus tracking algorithm plays a key role. Novel feature normalization circumvents the need for estimating vessel sizes and enables one to estimate contrast density and trade bolus using only features that can be extracted efficiently from acquired image sequences. The use of a parametric model, developed to characterize extracted features, makes the algorithm resistant to noise and feature extraction errors. Extensive experiments on real and simulated angiographic sequences have demonstrated the robustness, accuracy and efficiency of the tracking algorithm.","PeriodicalId":261632,"journal":{"name":"Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124590676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Preprocessing of fMR datasets fMR数据集的预处理

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692518

F. Kruggel, X. Descombes, D. Yves von Cramon

引用次数: 9

Shape-based indexing in a medical image database 医学图像数据库中基于形状的索引

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692519

Wei Zhang, Sven J. Dickinson, S. Sclaroff, Jacob Feldman, Stanley Dunn

引用次数: 38

The integration of automatic segmentation and motion tracking for 4D reconstruction and visualization of musculoskeletal structures 肌肉骨骼结构四维重建与可视化的自动分割与运动跟踪集成

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692437

Jose Gerardo Tamez-Peña, K. Parker, S. Totterman

引用次数: 19

Automatic motion analysis of the tongue surface from ultrasound image sequences 基于超声图像序列的舌表面自动运动分析

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692417

Y. Sinan Akgul, C. Kambhamettu, M. Stone

{"title":"Automatic motion analysis of the tongue surface from ultrasound image sequences","authors":"Y. Sinan Akgul, C. Kambhamettu, M. Stone","doi":"10.1109/BIA.1998.692417","DOIUrl":"https://doi.org/10.1109/BIA.1998.692417","url":null,"abstract":"The authors present a system for automatic 2D analysis of the tongue movement from digital ultrasound image sequences. The system focuses on extraction, tracking and analysis of the tongue surface during speech production and swallowing. The input to the system is provided by a Head and Transducer Support System (HATS), which is developed for use in ultrasound imaging of tongue movement. The authors developed a novel active contour (snakes) model that uses several adjacent images during the extraction of the tongue surface contour for an image frame. The user supplies an initial contour model for a single image frame in the sequence. This initial contour is a form of expert knowledge input to the system, which is used to find the candidate contour points in the adjacent images. Subsequently, the new snake mechanism is applied to estimate optimal contours for each image frame using these candidate points. Finally, the system uses a postprocessing method to refine the positions of the contours by utilizing more spatiotemporal information. The authors extended their previous work by applying the system to different speech and swallowing sequences using various constraints. The extended system can also extract qualitative local deformations with only a minimal computational overhead which may be useful for the diagnosis of Cerebellar Ataxic disorder. The authors tested the system on several different speech and swallowing sequences produced by HATS. During the tests, the authors saw that the system is flexible enough to be used in a wide variety of cases. In addition, visual inspection of the detected contours by the speech experts confirms that the results are very promising and this system can be effectively employed in speech and swallowing research.","PeriodicalId":261632,"journal":{"name":"Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162)","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115012188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Sulcal basins and sulcal strings as new concepts for describing the human cortical topography 沟盆地和沟串是描述人类皮层地形的新概念

Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162) Pub Date : 1998-06-26 DOI: 10.1109/BIA.1998.692384

G. Lohmann, D. V. Cramon

{"title":"Sulcal basins and sulcal strings as new concepts for describing the human cortical topography","authors":"G. Lohmann, D. V. Cramon","doi":"10.1109/BIA.1998.692384","DOIUrl":"https://doi.org/10.1109/BIA.1998.692384","url":null,"abstract":"Human brain mapping aims at establishing correspondences between brain function and brain anatomy. One of the most intriguing problems in this field is the high inter-personal variability of human neuroanatomy which makes studies across many subjects very difficult. The cortical folds (\"sulci\") often serve as landmarks that help to establish correspondences between subjects. Here, the authors present a method that both automatically detects and attributes neuroanatomical names to the cortical folds using image analysis methods applied to magnetic resonance data of human brains. The authors claim that the cortical folds can be subdivided into a number of substructures which they call sulcal basins. In addition to the concept of sulcal basins, the authors introduce the concept of sulcal strings which are groups of sulcal basins arranged as strings that are aligned with the Sylvian fissure and the inter-hemispheric cleft. The concept of sulcal basins allows to establish a complete parcellation of the cortical surface into separate regions. These regions are neuroanatomically meaningful and can be identified from MR data sets across many subjects. At the same time, the parcellation is detailed enough to be useful for brain mapping purposes.","PeriodicalId":261632,"journal":{"name":"Proceedings. Workshop on Biomedical Image Analysis (Cat. No.98EX162)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128948715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17