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检索条件"任意字段=3rd International Conference on Medical Image Computing and Computer-Assisted Intervention"

共 4110 条记录，以下是3921-3930 订阅

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Automating 3D echocardiographic image analysis 3rd

Automating 3D echocardiographic image analysis

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Sanchez-Ortiz, Gerardo I. Declerck, Jérôme Mulet-Parada, Miguel Alison Noble, J. Medical Vision Laboratory Department of Engineering Science University of Oxford Parks Road OxfordOX1 3PJ United Kingdom

ISBN: (纸本)3540411895

3D echocardiography is a recent cardiac imaging method actively developed for quantitative analysis of heart function. A major barrier for its use as a quantitative tool in routine clinical practice is the absence of accurate and robust segmentation and tracking methods necessary to make the analysis fully automatic. In this article we present a fully-automated 3D echocardiographic image processing protocol for assessment of left ventricular (LV) function. We combine global image information provided by a novel multi-scale fuzzy-clustering segmentation algorithm, with local boundaries obtained with phase-based acoustic feature detection. We fit and track the LV surface using a 4D continuous transformation. To our knowledge this is the first report of a completely automated method. The protocol is viable for clinical practice. We exhibit and compare qualitative and quantitative results on three 3D image sequences that have been processed manually, in semi-automatic manner, and in fully automated fashion. Volume curves are derived and the ejection fractions errors with respect to manual segmentation are shown to be below 5%. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Echocardiography

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Brainsuite: An automated cortical surface identification tool 3rd

Brainsuite: An automated cortical surface identification too...

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Shattuck, David W. Leahy, Richard M. Signal and Image Processing Institute Department of Electrical Engineering University of Southern California Los AngelesCA90089-2564 United States

ISBN: (纸本)3540411895

We describe a new magnetic resonance (MR) image analysis tool that produces cortical surface representations with spherical topology from MR images of the human brain. The tool provides a sequence of low-level operations in a single package that can produce accurate brain segmentations in clinical time. The tools include skull and scalp removal, image nonuniformity compensation, voxel-based tissue classification, topological correction, rendering, and editing functions. The collection of tools is designed to require minimal user interaction to produce cortical representations. In this paper we describe the theory of each stage of the cortical surface identification process. We then present validation results using real and phantom data. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Magnetic resonance

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The skull stripping problem in MRI solved by a single 3D watershed transform 3rd

The skull stripping problem in MRI solved by a single 3D wat...

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Hahn, Horst K. Peitgen, Heinz-Otto MeVis – Center for Medical Diagnostic Systems and Visualization Universitätsallee 29 Bremen28359 Germany

ISBN: (纸本)3540411895

A robust method for the removal of non-cerebral tissue in T1-weighted magnetic resonance (MR) brain images is presented. This procedure, often referred to as skull stripping, is an important step in neuroimaging. Our novel approach consists of a single morphological operation, namely a modified three-dimensional fast watershed transform that is perfectly suited to locate the brain, including the cerebellum and the spinal cord. The main advantages of our method lie in its simplicity and robustness. It is simple since neither preprocessing of the MRI data nor contour refinement is required. Furthermore, the skull stripping solely relies on one basic anatomical fact, i.e. the three-dimensional connectivity of white matter. As long as this feature is observed in the image data, a robust segmentation can be guaranteed independently from image orientation and slicing, even in presence of severe intensity non-uniformity and noise. For that purpose, the watershed algorithm has been modified by the concept of pre-flooding, which helps to prevent oversegmentation, depending on a single parameter. The automatic selection of the optimal parameter as well as the applicability are discussed based on the results of phantom and clinical brain studies. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Magnetic resonance imaging

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Ultrasound/MRI overlay with image warping for neurosurgery 3rd

Ultrasound/MRI overlay with image warping for neurosurgery

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Gobbi, David G. Comeau, Roch M. Peters, Terry M. Imaging Research Laboratories John P. Robarts Research Institute University of Western Ontario LondonONN6A 5K8 Canada McConnell Brain Imaging Centre Montreal Neurological Institute MontréalQCH3A 2B4 Canada

ISBN: (纸本)3540411895

Performing a craniotomy will cause brain tissue to shift. As a result of the craniotomy, the accuracy of stereotactic localization techniques is reduced unless the brain shift can be accurately measured. If an ultrasound probe is tracked by a 3D optical tracking system, intraoperative ultrasound images acquired through the craniotomy can be compared to pre-operative MRI images to quantify the shift. We have developed 2D and 3D image overlay tools which allow interactive, realtime visualization of the shift as well as software that uses homologous landmarks between the ultrasound and MRI image volumes to create a thin-plate-spline warp transformation that provides a mapping between pre-operative imaging coordinates and the shifted intra-operative coordinages. Our techniques have been demonstrated on poly vinyl alcohol cryogel phantoms which exhibit mechanical and imaging properties similar to those of the human brain. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Neurosurgery

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Fusing speed and phase information for vascular segmentation in phase contrast MR angiograms 3rd

Fusing speed and phase information for vascular segmentation...

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Chung, Albert C. S. Alison Noble, J. Summers, Paul Department of Engineering Science Oxford University Oxford United Kingdom Department of Clinical Neuroscience King’s College London United Kingdom

ISBN: (纸本)3540411895

This paper presents a statistical approach to aggregating speed and phase (directional) information for vascular segmentation in phase contrast magnetic resonance angiograms (PC-MRA), and proposes a Maxwell-Gaussian finite mixture distribution to model the background noise distribution. In this paper, we extend our previous work [6] to the segmentation of phase-difference PC-MRA speed images. We demonstrate that, rather than relying on speed information alone, as done by others [12,14,15], including phase information as a priori knowledge in a Markov random field (MRF) model can improve the quality of segmentation, especially the region within an aneurysm where there is a heterogeneous intensity pattern and significant vascular signal loss. Mixture model parameters are estimated by the Expectation-Maximization (EM) algorithm [3], In addition, it is shown that a Maxwell-Gaussian finite mixture distribution models the background noise more accurately than a Maxwell distribution and exhibits a better fit to clinical data. © Springer-Verlag Berlin Heidelberg 2000.

关键词： image segmentation

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Mixed reality merging of endoscopic images and 3-D surfaces 3rd

Mixed reality merging of endoscopic images and 3-D surfaces

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Dey, Damini Slomka, Piotr J. Gobbi, David G. Peters, Terry M. Imaging Research Laboratory John P. Robarts Research Institute London Canada Diagnostic Radiology and Nuclear Medicine London Health Sciences Center London Canada

ISBN: (纸本)3540411895

In image-guided neurosurgery, "mixed reality" merging has been used to merge video images with an underlying computer model. We have developed methods to map intra-operative endoscopic video to 3D surfaces derived from pre-operative scans for enhanced visualization during surgery. We acquired CT images of a brain phantom, and digitized endoscopic video images from a tracked neuro-endoscope. Registration of the phantom and CT images was accomplished using markers that could be identified in both spaces. The endoscopic images were corrected for radial lens distortion, and mapped onto surfaces extracted from the CT images via a ray-traced texture-mapping algorithm. The localization accuracy of the endoscope tip was within 1.0 mm. The mapping operation allows the endoscopic images to be permanently painted onto the surfaces. Our method allows panoramic and stereoscopic visualization from arbitrary perspectives (though the original endoscopic video was monoscopic) and navigation of the painted surface after the procedure. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Merging

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Comparison of three high-end endoscopic visualization systems on telesurgical performance 3rd

Comparison of three high-end endoscopic visualization system...

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Mintz, David Falk, Volkmar Kenneth Salisbury, J. Intuitive Surgical Inc 1340 W. Middlefield Rd Mountain ViewCA94043 United States Department of Cardiothoracic Surgery Stanford School of Medicine Stanford University United States Intuitive Surgical Inc Stanford University United States

ISBN: (纸本)3540411895

Previous studies and surgeon interviews have shown that most surgeons prefer quality standard definition (SD)TV 2D scopes to first generation 3D endoscopes. The use of a telesurgical system has eased many of the design constraints on traditional endoscopes, enabling the design of a high quality SDTV 3D endoscope and an HDTV endoscopic system with outstanding resolution. The purpose of this study was to examine surgeon performance and preference given the choice between these. The study involved two perceptual tasks and four visual-motor tasks using a telesurgical system using the 2D HDTV endoscope and the SDTV endoscope in both 2D and 3D mode. The use of a telesurgical system enabled recording of all the subjects motions for later analysis. Contrary to experience with early 3D scopes and SDTV 2D scopes, this study showed that despite the superior resolution of the HDTV system surgeons performed better with and preferred the SDTV 3D scope. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Endoscopy

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Registration of 3D intraoperative MR images of the brain using a finite element biomechanical model 3rd

Registration of 3D intraoperative MR images of the brain usi...

引用

3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Ferrant, Matthieu Warfield, Simon K. Nabavi, Arya Jolesz, Ferenc A. Kikinis, Ron Telecommunications Laboratory Université catholique de Louvain Belgium Surgical Planning Laboratory Brigham and Women’s Hospital and Harvard Medical School Boston United States

ISBN: (纸本)3540411895

We present a new algorithm for the non-rigid registration of 3D Magnetic Resonance (MR) intraoperative image sequences showing brain shift. The algorithm tracks key surfaces (cortical surface and the lateral ventricles) in the image sequence using an active surface algorithm. The volumetric deformation field of the objects the surfaces are embedded in is then inferred from the displacements at the boundary surfaces using a biomechanical finite element model of these objects. The biomechanical model allows us to analyse characteristics of the deformed tissues, such as stress measures. Initial experiments on an intraoperative sequence of brain shift show a good correlation of the internal brain structures after deformation using our algorithm, and a good capability of measuring surface as well as subsurface shift. We measured distances between landmarks in the deformed initial image and the corresponding landmarks in the target scan. The surface shift was recovered from up to 1cm down to less than 1mm, and subsurface shift from up to 6mm down to 3mm or less. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Magnetic resonance

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Localization of 3D anatomical point landmarks in 3D tomographic images using deformable models 3rd

Localization of 3D anatomical point landmarks in 3D tomograp...

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Frantz, Sönke Rohr, Karl Stiehl, H. Siegfried Universität Hamburg Fachbereich Informatik Arbeitsbereich Kognitive Systeme Vogt-Kölln-Str. 30 Hamburg22527 Germany

ISBN: (纸本)3540411895

Existing differential approaches to the localization of 3D anatomical point landmarks in 3D tomographic images are relatively sensitive to noise as well as to small intensity variations, both of which result in false detections as well as affect the localization accuracy. In this paper, we introduce a new approach to 3D landmark localization based on deformable models, which takes into account more global image information in comparison to differential approaches. To model the surface at a landmark, we use quadric surfaces combined with global deformations. The models are fitted to the image data by optimizing an edge-based fitting measure that incorporates the strength as well as the direction of the intensity variations. Initial values for the model parameters are determined by a semi-automatic differential approach. We obtain accurate estimates of the 3D landmark positions directly from the fitted model parameters. Experimental results of applying our new approach to 3D tomographic images of the human head are presented. In comparison to a pure differential approach to landmark localization, the localization accuracy is significantly improved and also the number of false detections is reduced. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Deformation

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Simulating minimally invasive neurosurgical interventions using an active manipulator 3rd

Simulating minimally invasive neurosurgical interventions us...

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3rd international conference on medical image computing and computer-assisted intervention, MICCAI 2000

作者： Radetzky, Arne Rudolph, Michael Stefanon, Wemer Starkie, Stephen Davies, Brian Auer, Ludwig M. Institute of Applied Sciences in Medicine ISM-Austria Jakob-Haringer Str. 3 SalzburgA-5020 Austria Department of Mechanical Engineering Imperial College of Science Technology and Medicine LondonSW7 2BX United Kingdom

ISBN: (纸本)3540411895

This application report describes the software system ROBO-SIM, which is a planning and simulation tool for minimally invasive neurosurgery. Using actual patients’ datasets, ROBO-SIM consists of a planning unit and a simulator for microsurgical manipulations. The planning steps are 1. definition of the trepanation for entry into the intracranial space and virtual craniotomy, 2. the target point within the depth of the brain, 3. control of the surgical track, 4. definition of go-areas for use with an intra-operative active manipulator. The simulator allows neurosurgeons to perform virtual surgical interventions using actual patient data and the same instruments as for the real operation. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Manipulators

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