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检索条件"任意字段=5th International Conference on Medical Image Computing and Computer-Assisted Intervention"

共 2882 条记录，以下是2771-2780 订阅

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Hexapod intervention planning for a robotic skull-base surgery system 4th

引用

4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： Sim, Charlie Teo, Ming-Yeong Ng, Wan-Sing Yap, Carl Loh, Yong-Chong Yeo, Tseng-Tsai Bai, Shao-Ping Lo, Charles School of Mechanical and Production Engineering Nanyang Technological University Computer Integrated Medical Intervention Lab 50 Nanyang Avenue 639798 Singapore National Neuroscience Institute Jalan Tan Tock Seng 308433 Singapore

ISBN: (纸本)3540426973

this paper introduces a novel intervention planning methodology facilitating the use of a parallel manipulator (Hexapod) in a robotic skull-base surgery (.SBS.) system. this safety intensive procedure requires a cavity to be created in the skull-base so as to allow access to deep-seated brain areas that are inaccessible by other routes. An image-guided system (presenting 3-D information) allows the surgeon to pre-operatively define the features that are to be avoided. Although the Hexapod used has good positioning accuracy and high stiffness, its workspace suffers from some undesirable characteristics. A novel technique has been developed to alleviate this problem by means of segregating the task-envelope (i.e. the cavity in the skull-base) and Hexapod workspace generation process. the placement of the task-envelope within the reachable workspace of the Hexapod is planned in a virtual world. this "placement" is then replicated in the physical world by the use of a dexterous base robot supporting the Hexapod. this ensures that the region encapsulated by the task-envelope encapsulated is fully reachable by the Hexapod. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Virtual reality

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Towards a Robust path growing algorithm for semi-automatic MRI segmentation 4th

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4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： Nielsen, Casper F. Passmore, Peter J. School of Computing Science Middlesex University Bounds Green Road LondonN11 2NQ United Kingdom

ISBN: (纸本)3540426973

Segmentation of MRI volumes is complicated by RF inhomogeneity, noise and partial volume artifacts. Fully automatic methods often do not cope well with a combination of these problems. Semi-automatic methods are generally too simplistic or require a large amount of user interaction to work. Adaptable Class-Specific Representation (ACSR), implemented by the Path Growing Algorithm (PGA), is a semi-automatic segmentation framework, which has previously been demonstrated to produce accurate and robust segmentation of colour cryo section volumes with a minimal requirement for user interaction. this paper presents an evaluation of three different PGAs to implement ACSR for the MRI modality. Results are based on simulated data from the BrainWeb image database. Future work towards a robust solution is discussed. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Automation

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Hybrid Segmentation of Anatomical Data 4th

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4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： Imielinska, Celina Metaxas, Dimitris Udupa, Jayaram Jin, Yinpeng Chen, Ting College of Physicians and Surgeons Office of Scholarly Resources Medical Informatics Dept. and Dept. of Computer Science Columbia University United States Dept. of Computer and Information Science University of Pennsylvania United States Medical Image Processing Group Dept. of Radiology University of Pennsylvania United States Department of Biomedical Engineering Columbia University United States

ISBN: (纸本)3540426973

We propose new hybrid methods for automated segmentation of radiological patient data and the Visible Human data. In this paper, we integrate boundary-based and region-based segmentation methods which amplifies the strength but reduces the weakness of both approaches. the novelty comes from combining a boundary-based method, the deformable model-based segmentation with region-based segmentation methods, the fuzzy connectedness and Voronoi Diagram-based segmentation, to develop hybrid methods that yield high precision, accuracy and efficiency. this work is a part of a NTM funded effort to provide a fully implemented and tested Visible Human Project Segmentation and Registration Toolkit (Insight). © Springer-Verlag Berlin Heidelberg 2001.

关键词： Hospital data processing

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Intensity-based non-rigid registration using adaptive multilevel free-form deformation with an incompressibility constraint 4th

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4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： Rohlfing, Torsten Maurer, Calvin R. Image Guidance Laboratories Department of Neurosurgery Stanford University Medical Center 300 Pasteur Drive StanfordCA94305-5327 United States

ISBN: (纸本)3540426973

A major problem with non-rigid image registration techniques in many applications is their tendency to reduce the volume of contrast-enhancing structures [10]. Contrast enhancement is an intensity inconsistency, which is precisely what intensity-based registration algorithms are designed to minimize. therefore, contrast-enhanced structures typically shrink substantially during registration, which affects the use of the resulting transformation for volumetric analysis, image subtraction, and multispectral classification. A common approach to address this problem is to constrain the deformation. In this paper we present a novel incompressibility constraint approach that is based on the Jacobian determinant of the deformation and can be computed *** apply our intensity-based non-rigid registration algorithm with this incompressibility constraint to two clinical applications (MR mammography, CT-DSA) and demonstrate that it produces high-quality deformations (as judged by visual assessment) while preserving the volume of contrast-enhanced structures. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Deformation

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Evaluation of diffusion techniques for improved vessel visualization and quantification in three-dimensional rotational angiography 4th

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4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： Meijering, Erik Niessen, Wiro Weickert, Joachim Viergever, Max Image Sciences Institute University Medical Center Utrecht Heidelberglaan 100 UtrechtNL-3584 CX Netherlands Computer Vision Graphics and Pattern Recognition Group Department of Mathematics and Computer Science University of Mannheim MannheimD-68131 Germany

ISBN: (纸本)3540426973

three-dimensional rotational angiography (3DRA) is a promising imaging technique which yields high-resolution isotropic 3D images of vascular structures. Raw 3DRA images, however, usually suffer from a high noise level and the presence of other artifacts. For accurate visualization and quantification of vascular anomalies, noise reduction is therefore highly desirable. In this paper we analyze the effects of several linear and nonlinear filtering techniques for that purpose. From the results of in vitro experiments we conclude that edge-enhancing anisotropic diffusion is very suitable for mentioned tasks. However, in view of the computational requirements of this technique, the regularized isotropic nonlinear diffusion scheme may be considered a useful alternative. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Diffusion

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Limits to the accuracy of 3D thickness measurement in magnetic resonance images 4th

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4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： Sato, Yoshinobu Nakanishi, Katsuyuki Tanaka, Hisashi Nishii, Takashi Sugano, Nobuhiko Nakamura, Hironobu Ochi, Takahiro Tamura, Shinichi Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine Japan Department of Radiology Osaka University Graduate School of Medicine Japan Department of Orthopaedic Surgery Osaka University Graduate School of Medicine Japan Division of Computer Integrated Orthopaedic Surgery Osaka University Graduate School of Medicine Japan

ISBN: (纸本)3540426973

Measuring the thickness of sheet-like (or plate-like) anatomical structures, such as articular cartilages and brain cortex, in 3D magnetic resonance (MR) images is often an important diagnostic procedure. the purpose of this paper is to investigate the fundamental limits to the accuracy of thickness determination in MR images. Given imaging and postprocessing parameters, the characteristics of thickness determination accuracy are derived by means of a theoretical simulation method, focusing especially on the effect of sheet structure orientation on accuracy in the case of noncubic (anisotropic) voxels. the theoretical simulation was validated by in vitro experiments. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Magnetic resonance

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Phase-Based User-Steered image Segmentation 4th

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4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： O’Donnell, Lauren Westin, Carl-Fredrik Grimson, W. Eric L. Ruiz-Alzola, Juan Shenton, Martha E. Kikinis, Ron MIT AI Laboratory CambridgeMA02139 United States Brigham and Women’s Hospital Harvard Medical School BostonMA United States Dept of Signals and Communications University of Las Palmas de Gran Canaria Spain

ISBN: (纸本)3540426973

this paper presents a user-steered segmentation algorithm based on the livewire paradigm. Livewire is an image-feature driven method that finds the optimal path between user-selected image locations, thus reducing the need to manually define the complete boundary. We introduce an image feature based on local phase, which describes local edge symmetry independent of absolute gray value. Because phase is amplitude invariant, the measurements are robust with respect to smooth variations, such as bias field inhomogeneities present in all MR images. In order to enable validation of our segmentation method, we have created a system that continuously records user interaction and automatically generates a database containing the number of user interactions, such as mouse events, and time stamps from various editing modules. We have conducted validation trials of the system and obtained expert opinions regarding its functionality. © Springer-Verlag Berlin Heidelberg 2001.

关键词： image segmentation

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A mesh-based shape analysis framework 4th

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4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： Jacq, Jean-José Roux, Christian Département Image et Traitement de l’Information ENST Bretagne Technopôle de Brest-Iroise B.P. 832 Brest29285 France CHU Morvan 5 Avenue Foch Brest29200 France

ISBN: (纸本)3540426973

We propose an efficient and non-parametric hierarchical partitioning approach that operates on a general 3D shape. the method suggested makes it possible to process an arbitrary shape provided that it can be described as a triangle mesh. the basic idea is to extend the use of the basin districts concept on curved spaces - such a partitioning process being applied on valuation issued from the computation of main curvatures over a polyhedral support. Hierarchical construction of basin districts is obtained from a Watershed Transform. In our working case, an efficient use of this well known transformation implies to be able to manage front propagations on a polyhedral surface with speed controled by the local characteristics of surface geometry. Moreover, the ability to provide an intrinsic shape partition from any triangle mesh lead us to propose a robust extension to usual mesh simplification algorithms. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Curve fitting

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Blood pool agent CE-MRA: Improved arterial visualization of the aortoiliac vasculature in the steady-state using first-pass data 4th

引用

4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： van Bemmel, C.M. Niessen, W.J. Wink, O. Verdonck, B. Viergever, M.A. Image Sciences Institute University Medical Center Utrecht Heidelberglaan 100 Utrecht CX3584 Netherlands EasyVision Advanced Development Philips Medical Systems Postbus 10000 Best Netherlands

ISBN: (纸本)3540426973

Blood pool agent (BPA) contrast-enhanced magnetic resonance angiography (CE-MRA) images have been acquired during the first-pass of the contrast agent and in the steady-state. Arterial visualization, which is hampered in the steady-state owing to simultaneous enhancement of arteries and veins, can be improved if the central arterial axis (CAA) is known. A method is presented that utilizes the first-pass data to find the CAA in the steady-state data with minimum user interaction. the accuracy of the resulting CAA is compared to tracings of two observers in three datasets. It was found that the average error of the method is 0.73 mm in the first-pass data and 1.54 mm in the steady-state data. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Visualization

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A surgery simulation supporting cuts and finite element deformation 4th

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4th international conference on medical image computing and computer-assisted intervention, MICCAI 2001

作者： Nienhuys, Han-Wen van der Stappe, A. Frank Institute of Information and Computing Sciences Utrecht University PO Box 80089 Utrecht3508 TB Netherlands

ISBN: (纸本)3540426973

Interactive surgery simulations have conflicting requirements of speed and accuracy. In this paper we show how to combine a relatively accurate deformation model—the Finite Element (FE) method— and interactive cutting without requiring expensive matrix updates or precomputation. Our approach uses an iterative algorithm for an interactive linear FE deformation simulation. the iterative process requires no global precomputation, so runtime changes of the mesh, i.e. cuts, can be simulated efficiently. Cuts are performed along faces of the mesh;this prevents growth of the mesh. We present a provably correct method for changing the mesh topology, and a satisfactory heuristic for determining along which faces to perform cuts. Nodes within the mesh are relocated to align the mesh with a virtual scalpel. this prevents a jagged surface appearance, but also generates degeneracies, which are removed afterwards. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Finite element method

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