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2D+T acoustic boundary detection in echocardiography

medical image ANALYSIS 2000年第1期4卷 21-30页

作者： Mulet-Parada, M Noble, JA Univ Oxford Dept Engn Sci Robot Res Grp Oxford OX1 3PJ England

In this paper we address the problem of spatio-temporal acoustic boundary detection in echocardiography. We propose a phase-based feature detection method to be used as the front end to higher-level 2D+T/3D+T reconstruction algorithms. We develop a 2D+T version of this algorithm and illustrate its performance on some typical echocardiogram sequences. We show how our temporal-based algorithm helps to reduce the number of spurious feature responses due to speckle and provides feature velocity estimates. Further, our approach is intensity-amplitude invariant. This makes it particularly attractive for echocardiographic segmentation, where choosing a single global intensity-based edge threshold is problematic. (C) 2000 Elsevier Science B.V. All rights reserved.

关键词： 2D+T ultrasound echocardiography heart wall motion quadrature filters Log-Gabor wavelets

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diSNei: A collaborative environment for medical images analysis and visualization 3rd

diSNei: A collaborative environment for medical images analy...

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

作者： Alberola, Carlos Cárdenes, Rubén Martín, Marcos Martín, Miguel A. Rodríguez-Florido, Miguel A. Ruiz-Alzola, Juan ETSI Telecomunicación University of Valladolid Spain Dep Señales y Comunicaciones University of Las Palmas de Gran Canaria Spain Department Radiology Harvard Medical School and Brigham and Women’s Hospital United States

ISBN: (纸本)3540411895

In this paper we describe our environment diSNei, a graphical tool for collaborative image analysis and visualization of models created out of slices of volume data;this application allows a number of users to simultaneous and coordinatedly analyze medical images, create graphical models, navigate through them and superimpose raw data onto the models. The application is intended to help physicians interpret data in the case that ambiguous situations may appear, by means of collaboration with other colleagues. It is therefore an integrated environment for expertise interchange among physicians and we believe that it is a powerful tool for academic purposes as well. Other outstanding application features are its being multiplatform, and, particularly, the fact that it can run on NT computers, and the support for stereo rendering so as to obtain a deep sensation of inmersion into the models. © Springer-Verlag Berlin Heidelberg 2000.

关键词： image analysis

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Automatic centerline extraction for 3D virtual bronchoscopy 3rd

Automatic centerline extraction for 3D virtual bronchoscopy

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

作者： Law, Tsui Ying Heng, Pheng Ann Department of Computer Science and Engineering The Chinese University of Hong Kong Shatin N.T Hong Kong

ISBN: (纸本)3540411895

Centerline extraction is the basis to understand three dimensional structure of the lung. In this paper, an automatic centerline determination algorithm for three dimensional virtual bronchoscopy CT image is presented. This algorithm has two main components. They are end points retrieval algorithm and graph based centerline algorithm. The end points retrieval algorithm first constructs a binary tree which links up all necessary center points of each region in each slice from segmented lung airway tree volume data. Next, it extracts the end points of the lung airway tips from the binary tree. The graph based centerline algorithm reads the end points and applies distance transform to yield a distance map which shows all shortest paths from the start point to those end points. Then, modified Dijkstra shortest path algorithm is applied in the centerline algorithm to yield the centerline of the bronchus. Our algorithm is tested with various CT image data and its performance is encouraging. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Extraction

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Robust midsagittal plane extraction from coarse, pathological 3D images 3rd

Robust midsagittal plane extraction from coarse, pathologica...

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

作者： Liu, Yanxi Collins, Robert T. Rothfus, William E. The Robotics Institute Carnegie Mellon University Pittsburgh15213 United States University of Pittsburgh Medical Center PittsburghPA United States

ISBN: (纸本)3540411895

This paper focuses on the evaluation of an ideal midsagittal plane (iMSP) extraction algorithm. The algorithm was developed for capturing the iMSP from 3D normal and pathological neural images. The main challenges are the drastic structural asymmetry that often exists in pathological brains, and the sparse, nonisotropic data sampling that is common in clinical practice. A simple edge-based, cross-correlation approach is presented that decomposes the iMSP extraction problem into discovery of symmetry axes from 2D slices, followed by robust estimation of 3D plane parameters. The algorithm’s tolerance to brain asymmetries, input image offsets and image noise is quantitatively measured. It is found that the algorithm can extract the iMSP from input 3D images with (1) large asymmetrical lesions;(2) arbitrary initial yaw and roll angle errors;and (3) low signal-to-noise level. Also, no significant difference is found between the iMSP computed by the algorithm and the midsagittal plane estimated by two trained neuroradiologists. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Extraction

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Myotrack: A 3D deformation field method to measure cardiac motion from gated SPECT

Myotrack: A 3D deformation field method to measure cardiac m...

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

作者： Thirion, Jean-Philippe Benayoun, Serge HealthCenter Internet Services 449 route des cretes Sophia-Antipolis06560 France

ISBN: (纸本)3540411895

We are presenting a new method for Gated SPECT analysis. We segment the myocardium walls in the first time frame (end diastole) and then compute volumetric motion fields between time frames for tracking. The application of dense motion field to segmented walls provides us with individual 3D trajectories for endo-and epicardium wall points. Besides traditional measurements like ejection fraction, radial motion and thickness variations, it allows us to derive original measurements such as focus of contraction, axial contraction, elevation and twist, and compute an average image where cardiac motion blur is suppressed. The method is packaged in a comprehensive research prototype, MyoTrackVB, which is currently evaluated by medical partners with more than 200 cases already processed. © Springer-Verlag Berlin Heidelberg 2000.

关键词： medical imaging

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Efficient semiautomatic segmentation of 3D objects in medical images 3rd

Efficient semiautomatic segmentation of 3D objects in medica...

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

作者： Schenk, Andrea Prause, Guido Peitgen, Heinz-Otto MeVis – Center for Medical Diagnostic Systems and Visualization Universitaetsallee 29 Bremen28359 Germany

ISBN: (纸本)3540411895

We present a fast and accurate tool for semiautomatic segmentation of volumetric medical images based on the live wire algorithm, shape-based interpolation and a new optimization method. While the user-steered live wire algorithm represents an efficient, precise and reproducible method for interactive segmentation of selected twodimensional images, the shape-based interpolation allows the automatic approximation of contours on slices between user-defined boundaries. The combination of both methods leads to accurate segmentations with significantly reduced user interaction time. Moreover, the subsequent automated optimization of the interpolated object contours results in a better segmentation quality or can be used to extend the distances between user-segmented images and for a further reduction of interaction time. Experiments were carried out on hepatic computer tomographies from three different clinics. The results of the segmentation of liver parenchyma have shown that the user interaction time can be reduced more than 60% by the combination of shape-based interpolation and our optimization method with volume deviations in the magnitude of inter-user differences. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Interpolation

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computer-assisted anatomical placement of a double-bundle ACL through 3D-fitting of a statistically generated femoral template into individual knee geometry 3rd

Computer-assisted anatomical placement of a double-bundle AC...

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

作者： Luites, J.W.H. Wymenga, A.B. Sati, M. Bourquin, Y. Blankevoort, L. Van Der Venne, R. Kooloos, J.G.M. Staubli, H.-U. SMK-Research St. Maartenskliniek P.O. 9011 Nijmegen6500GM Netherlands Maurice E. Muller Institute for Biomechanics University of Bern Switzerland Orthopaedic Research Center Amsterdam Academic Medical Center University of Amsterdam Amsterdam Netherlands Orhopaedic Research Laboratory University of Nijmegen Nijmegen Netherlands Dept of Orthopaedic Surgery Surgical Clinic Tiefenauspital Bern Switzerland Dept of Orthopaedic Surgery St. Maartenskliniek P.O. 9011 Nijmegen6500GM Netherlands Dept of Anatomy and Embryology University of Nijmegen Nijmegen Netherlands

ISBN: (纸本)3540411895

Femoral graft placement is an important factor in the success of ACL-reconstruction. Besides improving the accuracy of femoral tunnel placement, computer assisted Surgery (CAS) can be used to determine the anatomic location. This requires a 3D femoral template with the position of the anatomical ACL-center, based on endoscopical measurable landmarks. This study describes the development and application of this method. The template is generated through statistical shape analysis of the ACL-insertion, with respect to the anteromedial- (AMB) and posterolateral bundle (PLB). The data is mapped onto a cylinder and related to the intercondylar notch surface and the cartilage border on the lateral notch wall (n=33). The template was programmed in a computer-assisted system for ACL-replacement and validated. The program allows real-time tracking of the femur and interactive digitization under endoscopic control. In a wizard-like fashion the surgeon is guided through steps of acquiring the landmarks for the template alignment. The AMB- and PLB-center are accurate positioned within 1-3 mm of the anatomic insertion-centers in individual knees. © Springer-Verlag Berlin Heidelberg 2000.

关键词： medical computing

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A deformable vessel model with single point initialization for segmentation, quantification and visualization of blood vessels in 3D MRA 3rd

A deformable vessel model with single point initialization f...

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

作者： Hemandez-Hoyos, Marcela Anwander, Alfred Orkisz, Maciej Roux, Jean-Pierre Douek, Philippe Magnin, Isabelle E. affiliated to INSERM Lyon France CREATIS INSA 50220 av. Albert Einstein Villeurbanne cedex69621 France

ISBN: (纸本)3540411895

We deal with image segmentation applied to three-dimensional (3D) analysis of of vascular morphology in magnetic resonance angiography (MRA) images. The main goal of our work is to develop a fast and reliable method for stenosis quantification. The first step towards this purpose is the extraction of the vessel axis by an expansible skeleton method. Vessel boundaries are then detected in the planes locally orthogonal to the centerline using an improved active contour. Finally, area measurements based on the resulting contours allow the calculation of stenosis parameters. The expansible nature of the skeleton associated with a single point initialization of the active contour allows overcoming some limitations of traditional deformable models. As a result, the algorithm performs well even for severe stenosis and significant vessel curvatures. Experimental results are presented in 3D phantom images as well as in real images of patients. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Blood vessels

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Fixation-based surgery: A new technique for distal radius osteotomy 3rd

Fixation-based surgery: A new technique for distal radius os...

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

作者： Croitoru, H. Ellis, R.E. Small, C.F. Pichora, D.R. Computing and Information Science Mechanical Engineering Surgery Queen’s University at Kingston Canada

ISBN: (纸本)3540411895

Fixation-based surgery is a new technique for achieving difficult corrections in some orthopedic procedures. The method is premised on using a fixation device, such as a fracture-fixation plate, during the alignment and distration phases of an open-wedge osteotomy. The basic idea is similar to assembly of manufactured components: pilot holes are drilled in the bone fragments, the fixation plate is attached to one fragment and, when the fragment is moved, the alignment has been achieved when the pilot holes in one fragment line up with predetermined through holes in the fixation plate. The method has been specifically developed to address osteotomy of the distal radius to correct a malunited fracture. The method has been validated in laboratory studies. Clinical trials suggest that the method is no slower than the conventional technique, there is almost no intraoperative X-ray exposure, and that exceptionally large corrections can easily be achieved. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Surgery

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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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