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

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Modeling surgical procedures for multimodal image-guided neurosurgery 4th

引用

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

作者： Jannin, P. Raimbault, M. Morandi, X. Gibaud, B. Laboratoire IDM Umversite de Rennes 12 avenue du Pr Leon Bernard CS 34317 RENNES Cedex35043 France Department of Neurosurgery Hopital Umversitarre de Rennes Rue H. Le Gmlloux RENNES Cedex 935033 France

ISBN: (纸本)3540426973

We present a model of surgical procedures that facilitates the management of multimodal information (i.e. anatomical and functional) in the context of multimodal image-guided craniotomies. We suggest that a surgical procedure be considered as a script consisting of a set of successive steps. Each step comprises a list of image entities extracted from multimodal images and relevant for the performance of this surgical step, and an action describing the purpose of the step. Each image entity has a role that may be different from step to step. this model is described by a UML class diagram and a textual description. We also present the results of a preliminary validation of the model performed on 15 clinical cases. the validation has shown the relevance of our model on the clinical cases studied and has confirmed the main assumptions we made to define the model. Even though further semantic validation is required, some benefits of this approach can be outlined: it improves management of multimodal information by describing when and why images are essential in the performance of the surgical act (e.g. place and role of images in the surgical script) and adapts visualization and interaction modes in neuronavigation. Our model should enhance preparation and guidance of surgery and lead to the development of simulation and even teaching tools. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Neurosurgery

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A generic framework for non-rigid registration based on non-uniform multi-level free-form deformations 4th

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

作者： Schnabel, Julia A. Rueckert, Daniel Quist, Marcel Blackall, Jane M. Castellano-Smith, Andy D. Hartkens, thomas Penney, Graeme P. Hall, Walter A. Liu, Haiying Truwit, Charles L. Gerritsen, Frans A. Hill, Derek L. G. Hawkes, David J. Computational Imaging Science Group Radiological Sciences and Medical Engineering Guy’s Hospital King’s College London United Kingdom Visual Information Processing Dept Computing Imperial College of Science Technology and Medicine London United Kingdom EasyVision Advanced Development Philips Medical Systems Best Netherlands Dept. Neurosurgery University of Minnesota MinneapolisMN United States Dept. Radiology University of Minnesota MinneapolisMN United States

ISBN: (纸本)3540426973

this work presents a framework for non-rigid registration which extends and generalizes a previously developed technique by Rueckert et al. [1]. We combine multi-resolution optimization with free-form deformations (FFDs) based on multi-level B-splines to simulate a non-uniform control point distribution. We have applied this to a number of different medical registration tasks to demonstrate its wide applicability, including interventional MRI brain tissue deformation compensation, breathing motion compensation in liver MRI, intramodality inter-modality registration of pre-operative brain MRI to CT electrode implant data, and inter-subject registration of brain MRI. Our results demonstrate that the new algorithm can successfully register images with an improved performance, while achieving a significant reduction in run-time. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Magnetic resonance imaging

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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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Guide wire tracking during endovascular interventions 3rd

Guide wire tracking during endovascular interventions

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

作者： Baert, SAM Niessen, WJ Meijering, EHW Frangi, AF Viergever, MA Univ Utrecht Med Ctr Image Sci Inst NL-3508 GA Utrecht Netherlands

ISBN: (纸本)3540411895

A method is presented to extract and track the position of a guide wire during endovascular interventions under X-ray fluoroscopy. the method can be used to improve guide wire visualization in the low quality fluoroscopy images. A two-step procedure is utilized to track the guide wire in subsequent frames. First a rough estimate of the displacement is obtained using a template matching procedure. Subsequently, the position of the guide wire is determined by fitting the guide wire to a feature image in which line-like structures are enhanced. In this optimization step the influence of the scale at which the feature is calculated and the additional value of using directional information is investigated. the method is applied both on the original and subtraction images. Using the proper parameter settings, the guide wire could successfully be tracked based on the original images, in 141 out of 146 frames from 5 image sequences.

关键词： guide wire tracking medical image processing interventional radiology

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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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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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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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Facial expression recognition of person without language ability based on the optical flow histogram

Facial expression recognition of person without language abi...

引用

international conference on Signal Processing Proceedings (ICSP)

作者： Y. Dai Y. Shibata K. Hashimoto T. Ishii A. Osuo K. Katamachi K. Nokuchi N. Kakizaki D. Cai Faculty of software and information science Iwate University Iwate Japan

A method to extract the facial actions and recognize the expressions of a person without language is presented. In this proposed method, a difference image of two successive frames of an image sequence, and a corresponding I component image in YIQ image representation were combined to extract the facial action and detect the facial region. the optical flows of the corresponding image sequence, in which the facial actions appeared, were computed. Based on the optical flow projection histogram on X and Y coordinate axes in the mouth region and the eye region, the motion features of the facial expressions were extracted to compose the associate memory model of the facial expressions. By utilizing this model, the facial expressions were recognized.

关键词： Face recognition image motion analysis Histograms Data mining image sequences Optical computing medical services Skin image representation Face detection

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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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