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检索条件"任意字段=8th International Conference on Medical Image Computing and Computer-Assisted Intervention"

共 2694 条记录，以下是2611-2620 订阅

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Automatic construction of 3D statistical deformation models using non-rigid registration 4th

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

作者： Rueckert, D. Frangi, A.F. Schnabel, J.A. Visual Information Processing Department of Computing Imperial College London United Kingdom Grupo de Tecnologia de las Comunicaciones Departamento de Ingenieria Electronica y Comunicaciones Universidad de Zaragoza Spain Utrecht Netherlands Computational Imaging Science Group Guy’s Hospital King’s College London United Kingdom

ISBN: (纸本)3540426973

In this paper we introduce the concept of statistical deformation models (SDM) which allow the construction of average models of the anatomy and their variability. SDMs are built by performing a statistical analysis of the deformations required to map anatomical features in one subject into the corresponding features in another subject. the concept of SDMs is similar to active shape models (ASM) which capture statistical information about shapes across a population but offers several new advantages over ASMs: Firstly, SDMs can be constructed directly from images such as MR or CT without the need for segmentation which is usually a prerequisite for the construction of active shape models. Instead a non-rigid registration algorithm is used to compute the deformations required to establish correspondences between the reference subject and the subjects in the population class under investigation. Secondly, SDMs allow the construction of an atlas of the average anatomy as well as its variability across a population of subjects. Finally, SDMs take the 3D nature of the underlying anatomy into account by analysing dense 3D deformation fields rather than only the 2D surface shape of anatomical structures. We demonstrate the applicability of this new framework to MR images of the brain and show results for the construction of anatomical models from 25 different subjects. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Deformation

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Preface

引用

Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2001年 2208卷

作者： Niessen, Wiro J. Viergever, Max A. University Medical Center Utrecht Image Sciences Institute Heidelberglaan 100 Utrecht Netherlands

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3-D reconstruction of macroscopic optical brain slice images 3rd

3-D reconstruction of macroscopic optical brain slice images

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

作者： Colchester, A Ourselin, S Zhu, YG Bardinet, E He, Y Roche, A Al-Sarraj, S Nailon, B Ironside, J Ayache, N Univ Kent KIMHS Canterbury CT2 7NZ Kent England INRIA Epidaure Project Sophia Antipolis France Inst Psychiat London SE5 8AF England Western Gen Hosp Natl Creutzfeldt Jakob Dis Surveillance Unit Edinburgh EH4 2XU Midlothian Scotland

ISBN: (纸本)3540411895

We present a method for reconstruction of macroscopic optical images of post-mortem brain slices to form a 3-D volume. this forms a key part of a series of procedures to allow postmortem findings to be accurately registered with MR images, and more generally provides a method for 3-D mapping of the distribution of pathological changes throughout the brain. In this preliminary work, four brains from a study of Creutzfeldt-Jakob disease were examined. After brain fixation, the pathologist cut coronal slices several nun thick through the brain. the anterior and posterior faces of each slice were photographed. We show that the 2-D co-registration of each such pair of images was most effectively obtained if the slice was placed in a jig before photographing. Fiducials. on the jig were detected automatically and point-based rigid registration computed. For co-registration between slices, i.e., across a single cut, an intensity-based method for 2-D non-rigid registration is used which provided satisfactory results. By propagating the 2-D registrations through the volume and using the known slice thickness, the 3-D volume was reconstructed.

关键词： registration magnetic resonance image-to-pathology correlation Creutzfeldt-Jakob disease

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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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three-dimensional measurement of the femur using clinical ultrasound: Developing a basis for image guided intramedullary nail fixation of the femur 3rd

Three-dimensional measurement of the femur using clinical ul...

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

作者： Young, Dominic I. Staniforth, M. Hu, Richard W. McCaig Centre for Joint Injuries and Arthritis Research University of Calgary 2500 University Drive N.W CalgaryABT2N 1N4 Canada Calgary FootHills Hospital Department of Orthopaedic Surgery 1403 29 Street N.W CalgaryABT2N 2T9 Canada

ISBN: (纸本)3540411895

Purpose: Quantify the precision and accuracy in coordinate measurements of anatomic landmarks of the femur using spatially tracked ultrasound (US) images. Establish the limits on coordinate measurement errors required for accurate determination of bone fragment alignment during intramedullary (IM) nail fixation of femoral shaft fractures. Relevance: A surgical guidance system based on a three-dimensional (3D) representation of femoral anatomy from US images would eliminate the hazard of radiation exposure and potentially increase the accuracy of IM nailing procedures. Summary: Fiducial spheres (dia. 6.3mm) were embedded in a plastic femur to mark anatomic landmarks. the femur was suspended in a water tank and could be rotated about its long axis. An US probe was mounted to a track above the femur. images were collected at 5mm increments along the anterior, posterior, lateral and medial aspects. After the US experiment, fiducial centroid locations (x,y,z–coordinates) were measured in a coordinate measuring machine (CCM). Reconstructed fiducial positions from US images were compared to the CMM data to assess precision and accuracy. A numerical model relating errors in landmark coordinate measurements to rigid body alignment was implemented. the mean precision (std-dev.) in fiducial coordinate measurements was 1.69mm. Mean and maximum errors in fiducial positions were 17.65mm and 58.01mm, respectively. At the observed level of accuracy in coordinate measurements, the model predicted rigid body rotation errors of 3.4 (SD = 2.4)° and translation errors of 4.7 (SD = 3.2)mm. A proof-of-concept has been demonstrated in the use of clinical US to obtain a quantitative description of femoral anatomy in a 3D framework. the model of error limits provided a basis for assessing the capability of a tracked US system in the context of a clinical criterion for rotational alignment (anteversion angle). Accuracy requirements for landmark coordinate measurements were at the limits of th

关键词： Errors

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image analysis of nailfold capillary patterns from video sequences 2nd

Image analysis of nailfold capillary patterns from video seq...

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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Allen, PD Taylor, CJ Herrick, AL Moore, T Univ Manchester Wolfson Image Anal Unit Manchester M13 9PT Lancs England Univ Manchester Hope Hosp Ctr Rheumat Dis Salford M6 8HD Lancs England

ISBN: (纸本)354066503X

Video capillaroscopy is a widely used technique to assess the condition of the blood capillaries in the nailfold of patient's suffering from reduced peripheral circulation (Raynaud's phenomenon). this approach is complicated by the fact that gaps in the flow of blood can render capillaries incomplete in any single video frame. this paper describes a computer based system in which sequences of video frames are registered and combined to provide a composite image for analysis. We show that the images can be registered to an accuracy of approximately 2 mum, and that temporally variable features can be enhanced significantly by subtracting one standard deviation from the mean value for each pixel position in the video sequence.

关键词： image analysis

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A modified fuzzy c-means algorithm for MRI bias field estimation and adaptive segmentation 2nd

A modified fuzzy c-means algorithm for MRI bias field estima...

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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Ahmed, MN Yamany, SM Mohamed, NA Farag, AA Univ Louisville EE Dept Comp Vis & Image Proc Lab Louisville KY 40292 USA

ISBN: (纸本)354066503X

In this paper, we present a novel algorithm for adaptive fuzzy segmentation of MRI data and estimation of intensity inhomogeneities using fuzzy logic. MRI intensity inhomogeneities can be attributed to imperfections in the RF coils or some problems associated with the acquisition sequences. the result is a slowly-varying shading artifact over the image that call produce errors with conventional intensity-based classification. Our algorithm is formulated by modifying the objective function of the standard fuzzy c-means (FCM) algorithm to compensate for such inhomogeneities and to allow the labeling of a pixel (voxel) to be influenced by the labels in its immediate neighborhood. the neighborhood effect acts as a regularizer and biases the solution towards piecewise-homogeneous labeling. Such a regularization is useful in segmenting scans corrupted by salt and popper noise. Experimental results oil both synthetic images and NIR data are given to demonstrate the effectiveness and efficiency of the proposed algorithm.

关键词： Salt and pepper noise

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Global shape from shading for an endoscope image 2nd

Global shape from shading for an endoscope image

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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Yeung, SY Tsui, HT Yim, A Chinese Univ Hong Kong Dept Elect Engn Shatin Hong Kong Peoples R China Prince Wales Hosp Dept Surg Shatin Hong Kong Peoples R China

ISBN: (纸本)354066503X

Okatani and Deguchi[13] proposed a local Shape from Shading (SFS) method for endoscope images by assuming the point light, which is close to the projection center, to be at the projection center. We extended and modified their method and devised a global SFS algorithm for the reconstruction of the complex shape of ail internal organ. Since the surface of an organ is not Lambertian in general, we obtained the bi-directional reflection distribution function (BRDF) curve by calibration using a robot arm to achieve accurate endoscope orientation and positioning. Inspired by the idea of Kimmel and Bruckstein[8], global SFS method is based on the identification of singular points oil the distance map, which each has the surface normal pointing towards the light source. Equal distance contours are propagated from each singular point using a level set method to get a local distance map of the surface. this is repeated for all singular points. After that, a set of local distance maps are selected to be merged together to construct a global distance map using a new scheme. the shape of the object can then be obtained from the global distance map. Simulated and real experiments were performed to verify the algorithm. Experimental result of global SFS from a single real endoscope image of a human lung is quite good.

关键词： shape from shading level set propagation endoscope image

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Level-set surface segmentation and fast cortical range image tracking for computing intrasurgical deformations 2nd

Level-set surface segmentation and fast cortical range image...

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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Audette, MA Siddiqi, K Peters, TM McGill Univ Montreal Neurol Inst Montreal PQ Canada McGill Univ McGill Ctr Intelligent Machines Montreal PQ Canada John P Robarts Res Inst London ON N6A 5K8 Canada

ISBN: (纸本)354066503X

We propose a method for estimating intrasurgical brain shift for image-guided surgery. this method consists of five stages: the identification of relevant anatomical surfaces within the MRI/CT volume, range-sensing of the skin and cortex in the OR, rigid registration of the skin range image with its MRI/CT homologue, non-rigid motion tracking over time of cortical range images, and lastly, interpolation of this surface displacement information over the whole brain volume via a realistically valued finite element model of the head. this papers focuses on the anatomical surface identification and cortical range surface tracking problems. the surface identification scheme implements a recent algorithm which imbeds 3D surface segmentation as the level-set of a 4D moving front. A by-product of this stage is a Euclidean distance and closest point map which is later exploited to speed up the rigid and non-rigid surface registration. the range-sensor uses both laser-based triangulation and defocusing techniques to produce a 2D range profile, and is linearly swept across the skin or cortical surface to produce a 3D range image. the surface registration technique is of the iterative closest point type, where each iteration benefits from looking up, rather than searching for, explicit closest point pairs. these explicit point, pairs in turn are used in conjunction with a closed-form SVD-based rigid transformation computation and with fast recursive splines to make each rigid and non-rigid registration iteration essentially instantaneous. Our method is validated with a novel deformable brain-shaped phantom, made. of Polyvinyl Alcohol Cryogel.

关键词： Magnetic resonance imaging

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3D functional database of subcortical structures for surgical guidance in image guided stereotactic neurosurgery 2nd

3D functional database of subcortical structures for surgica...

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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Finnis, KW Starreveld, YP Parrent, AG Sadikot, AF Peters, TM Univ Western Ontario John P Robarts Res Inst London ON N6A 5K8 Canada London Hlth Sci Ctr London ON Canada McGill Univ Montreal Neurol Inst Montreal PQ Canada

ISBN: (纸本)354066503X

Current techniques for deep brain stereotactic neurosurgery require identification of targets by preoperative imaging localization. Many critical structures targeted in this way (the thalamic nuclei) are functionally distinct but not discernable on magnetic resonance images. these structures are also surrounded by critical brain areas which must not be damaged by the surgical procedure. these factors make accurate localization of lesion targets crucial. Digitized anatomical atlases derived from histochemically stained brain specimens registered to patient MRI datasets aid in delineating targets but accuracy of registration within-homogeneous anatomy remains questionable. To address this problem, we have designed a searchable and expandable database of functional organization for the sensorimotor thalamus, internal capsule, and internal pallidum from a population of patients (n=40). Data were obtained through microcellular recording, microstimulation, and macrostimulation mapping performed during stereotactic thalamotomies and pallidotomies. After registration of the database into standard stereotactic space, clustering of like physiological responses was noted in the internal capsule and sensorimotor thalamus and an articulated joint-based organization was observed in the internal pallidum. Furthermore, a clear delineation of the kinesthetic-paresthetic functional border was observed within the thalamus. When registered to a patient MR,I within our image guided visualization platform, the database provides a visual representation of deep brain functional organization facilitating physiological exploration and preoperative planning.

关键词： Magnetic resonance imaging

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