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

共 4109 条记录，以下是3721-3730 订阅

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Automated segmentation of the left and right ventricles in 4D cardiac SPAMM images 1

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5th international conference on medical image computing and computer-assisted intervention

作者： Montillo, A Metaxas, D Axel, L Univ Penn Philadelphia PA 19104 USA Rutgers State Univ Dept Biomed Engn Piscataway NJ 08854 USA NYU New York NY 10016 USA

ISBN: (数字)9783540457862

ISBN: (纸本)3540442243

In this paper we describe a completely automated volume-based method for the segmentation of the left and fight ventricles in 4D tagged MR (SPAMM) images for quantitative cardiac analysis. We correct the background intensity variation in each volume caused by surface coils using a new scale-based fuzzy connectedness procedure. We apply 3D grayscale opening to the corrected data to create volumes containing only the blood filled regions. We threshold the volumes by minimizing region variance or by an adaptive statistical thresholding method. We isolate the ventricular blood filled regions using a novel approach based on spatial and temporal shape similarity. We use these regions to define the endocardium contours and use them to initialize an active contour that locates the epicardium through the gradient vector flow of an edgemap of a grayscale-closed image. Both quantitative and qualitative results on normal and diseased patients are presented.

关键词： image segmentation

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Development of 4-dimensional human model system for the patient after total hip arthroplasty 1

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5th international conference on medical image computing and computer-assisted intervention

作者： Otake, Y Hagio, K Suzuki, N Hattori, A Sugano, N Yonenobu, K Ochi, T Jikei Univ Sch Med Inst High Dimens Med Imaging Tokyo Japan Osaka Univ Grad Sch Med Dept Comp Integrated Orthopaed Suita Osaka 5650871 Japan Osaka Univ Grad Sch Med Dept Orthopaed Surg Suita Osaka 5650871 Japan Osaka Minami Natl Hosp Dept Orthopaed Surg Kawachi Nagano Osaka 5860008 Japan

ISBN: (数字)9783540457862

ISBN: (纸本)3540442243

In total hip arthroplasty(THA), complications such as dislocation, loosening, or wearing of the sliding surface are serious clinical problem, and the daily motion of patients has been limited to some extent. However, it is hard to recognize the situation of the components during movement and to predict complications. We have developed the 4-dimensional human model that can visualize the motion of the patient's skeleton and estimate the risk of complications using computer simulation. At first we constructed a 3-dimensional skeletal model of the patient's lower limb from CT data. Then we acquired motion capture data from an infrared position sensor (VICON512, VICON Motion Systems, UK), and drove the patient's skeletal model corresponding to the captured data. Thus we were able to predict the prognosis after the installation of the artificial hip joint, and we have examined the accuracy of the measurements in this system following an experiment using an open MRI.

关键词： medical computing

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Active watersheds: Combining 3D watershed segmentation and active contours to extract abdominal organs from MR images 1

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5th international conference on medical image computing and computer-assisted intervention

作者： Lapeer, RJ Tan, AC Aldridge, R Univ E Anglia Sch Informat Syst Norwich NR4 7TJ Norfolk England UCL Dept Med Phys & Bioengn London WC1E 6JA England

ISBN: (数字)9783540457862

ISBN: (纸本)3540442243

The three-dimensional segmentation of regions of interest in medical images, be it a 2D slice by slice based approach or directly across the 3D dataset, has numerous applications for the medical professional. These applications may involve something as simple as visualisation up to more critical tasks such as volume estimation, tissue quantification and classification, the detection of abnormalities and more. In this paper we describe a method which aims to combine two of the more popular segmentation techniques: the watershed segmentation and the active contour segmentation. Watershed segmentation provides unique boundaries for a particular image or series of images but does not easily allow for the discrete nature of the image and the image noise. Active contours or snakes do possess this generalisation or smoothing property but are difficult to initialise and usually require to be close to the boundary of interest to converge. We present a hybrid approach by segmenting a region of interest (ROI) using a 3D marker-based watershed algorithm. The resulting ROI's boundaries are then converted into a contour, using a contour following algorithm which is explained during the course of the paper. Once the contours are determined, different parameter settings of internal/external forces allow the expert user to adapt the initial segmentation. The approach thus yields a fast initial segmentation from the watershed algorithm and allows fine-tuning using active contours. Results of the technique are illustrated on 3D colon, kidney and liver segmentations from MRI datasets.

关键词： Magnetic resonance imaging

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Preface 5th

引用

5th international conference on medical image computing and computer-assisted intervention, MICCAI 2002

作者： Dohi, Takeyoshi Kikinis, Ron Department of Mechano-informatics Graduate School of Information Science and Technology University of Tokyo 7-3-1 Hongo Bunkyo-kuTokyo113-8656 Japan Department of Radiology Brigham andWomen’s Hospital 75 Francis St. BostonMA02115 United States

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3D-visualization and registration for neurovascular compression syndrome analysis 1

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5th international conference on medical image computing and computer-assisted intervention

作者： Hastreiter, P Naraghi, R Tomandl, B Bauer, M Fahlbusch, R Neuroctr Dept Neurosurg D-91054 Erlangen Germany Div Neuroradiol D-91054 Erlangen Germany Univ Erlangen Nurnberg Comp Graph Grp D-8520 Erlangen Germany

ISBN: (数字)9783540457862

ISBN: (纸本)3540442243

Neurovascular compression syndromes are caused by a pathological contact between vessels and the root entry or exit zone of cranial nerves. Associated with a number of neurological diseases such as trigeminal neuralgia, hemifacial spasm or vertigo, there is also strong evidence for a direct relation with essential arterial hypertension. To treat the related conditions, operative microvascular decompression has proven to be very effective. So far, as a drawback for the examination, 2D representations of tomographic volumes served as exclusive source of information. Aiming at an improved spatial understanding, we introduce a noninvasive and fast approach providing clear delineation and interactive 3D visualization of all relevant structures. It is based on strongly T2 weighted MR volumes with sufficiently high resolution. Due to the size of the nerves and vessels at the brainstem, an explicit segmentation is extremely difficult. Therefore, we propose to segment only coarse structures with a sequence of filtering and volume growing. Consecutively, implicit segmentation with pre-defined transfer functions is applied to delineate the tiny target structures included in the area of cerebrospinal fluid. Additionally, we suggest registration with MR angiography to differentiate between vessels and nerves on one side and between arteries and veins on the other side. Overall, our approach contributes significantly to an optimized 3D analysis of vascular compression syndromes. The high value for the planning of surgery is demonstrated with several clinical examples.

关键词： visualization registration neurovascular compression

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Evaluation of image quality in medical volume visualization: The state of the art 5th

引用

5th international conference on medical image computing and computer-assisted intervention, MICCAI 2002

作者： Pommert, Andreas Höhne, Karl Heinz University Hospital Hamburg-Eppendorf Hamburg20251 Germany

ISBN: (纸本)3540442251

For applications of volume visualization in medicine, it is important to assure that the 3D images show the true anatomical situation, or at least to know about their limitations. In this paper, various methods for evaluation of image quality are reviewed. They are classified based on the fundamental terms of intelligibility and fidelity, and discussed with respect to the question what clues they provide on how to choose parameters, or improve imaging and visualization procedures. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Visualization

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Atlas-based segmentation and tracking of 3D cardiac MR images using non-rigid registration 1

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5th international conference on medical image computing and computer-assisted intervention

作者： Lorenzo-Valdés, M Sanchez-Ortiz, GI Mohiaddin, R Rueckert, D Univ London Imperial Coll Sci Technol & Med Dept Comp Visual Informat Proc Grp London SW7 2BZ England Royal Brompton & Harefield NHS Trust London England

ISBN: (数字)9783540457862

ISBN: (纸本)3540442243

We propose a novel method for fully automated segmentation and tracking of the myocardium and left and right ventricles (LV and RV) using 4D MR images. The method uses non-rigid registration to elastically deform a cardiac atlas built automatically from 14 normal subjects. The registration yields robust performance and is particularly suitable for processing a sequence of 3D images in a cardiac cycle. Transformations are calculated to obtain the deformations between images in a sequence. The registration algorithm aligns the cardiac atlas to a subject specific atlas of the sequence generated with the transformations. The method relates images spatially and temporally and is suitable for measuring regional motion and deformation, as well as for labelling and tracking specific regions of the heart. In this work experiments for the registration, segmentation and tracking of a cardiac cycle are presented on nine MRI data sets. Validation against manual segmentations and computation of the correlation between manual and automatic tracking and segmentation on 141 3D volumes were calculated. Results show that the procedure can accurately track the left ventricle (r=0.99), myocardium (r=0.98) and right ventricle (r=0.96). Results for segmentation are also obtained for left ventricle (r=0.92), myocardium (r=0.82) and right ventricle (r=0.90).

关键词： Heart

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Shear-warp volume rendering algorithms using linear level octree for PC-based medical simulation 5th

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5th international conference on medical image computing and computer-assisted intervention, MICCAI 2002

作者： Wang, Zhenlan Chui, Chee-Kong Ang, Chuan-Heng Nowinski, Wieslaw L. Biomedical Imaging Lab Singapore School of Computing National University of Singapore Singapore

ISBN: (纸本)3540442251

We describe a new algorithm for 3D, and potentially higher, volume rendering. This algorithm takes advantage of the shear-warp factorization technique to reduce matrix computing and a hierarchical data structure for better utilization of spatial coherence. The algorithm represents an improvement over existing algorithms in terms of performance, with little compromise in image quality. The algorithm benefits 3D volume rendering as well as multi-modality volume rendering. Initial work on comparison and validation of algorithm are done. The results and analysis show that the algorithm is promising. Our preliminary work in using this method for medical simulation is also discussed. This method is particularly suitable for PC-based medical simulation where the computation load is high and the raw computing power is limited. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Volume rendering

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3D prostate surface detection from ultrasound images based on level set method 5th

引用

5th international conference on medical image computing and computer-assisted intervention, MICCAI 2002

作者： Fan, Shao Voon, Ling Keck Sing, Ng Wan School of Electrical and Electronic Engineering CIMIL ─ Computer Integrated Medical Intervention Laboratory Nanyang Technological University 50 Nanyang Avenue 639798 Singapore School of Mechanical and Production Engineering CIMIL ─ Computer Integrated Medical Intervention Laboratory Nanyang Technological University 50 Nanyang Avenue 639798 Singapore

ISBN: (纸本)3540442251

Accurate detection of prostate boundaries is required in many diagnostic and treatment procedures for prostate diseases. In this paper, a new approach based on level set method to perform 3D prostate surface detection from transrectal ultrasound (TRUS) images is presented. Contrary to many other deformable models, level set method offers several advantages such as minimal need for user input, flexible topology, and straightforward extension to 3D. However, it is subject to "boundary leaking" problem for ultrasound image segmentation due to the poor image quality. In this work, we first develop a fast discrimination method to extract the prostate region, then this region information, instead of the spatial image gradient, is incorporated into the level set method to remedy the "boundary leaking" problem. Various experimental results show the effectiveness of the proposed method. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Numerical methods

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computer-assisted correction of bone deformities using a 6-DOF parallel spatial mechanism 1

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5th international conference on medical image computing and computer-assisted intervention, MICCAI 2002

作者： Iyun, O. Borschneck, D.P. Ellis, E. School of Computing Surgery Queen’s University Canada Mechanical Engineering Surgery Queen’s University Kingston Canada Surgery Queen’s University Kingston Canada

ISBN: (数字)9783540457862

ISBN: (纸本)9783540457862

The Ilizarov method is used to correct bone deformities by using an adjustable frame to simultaneously perform alignment and distraction of an open-wedge osteotomy. We have adapted the idea of fixation-based surgery, which requires computer-assisted planning and guidance, to the Ilizarov method with the Taylor frame. This work incorporates the kinematics of the Taylor frame (a Stewart platform) into the planning and application phases of surgery. The method has been validated in laboratory studies. The study shows that the method requires almost no intraoperative X-ray exposure and that complex corrections can easily be achieved. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Bone

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