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7th international conference on medical image computing and computer-assisted intervention, MICCAI 2004

作者： Kemper, Corey A. Talos, Ion-Florin Golby, Alexandra Black, Peter M. Kikinis, Ron Grimson, W. Eric L. Warfield, Simon K. Massachusetts Institute of Technology CambridgeMA02139 United States Departments of Neurosurgery and Radiology Brigham and Women’s Hospital Harvard Medical School BostonMA02115 United States

ISBN: (纸本)3540229779

In order to combine preoperative data with intraoperative scans for image-guided neurosurgery visualization, accurate registration is necessary. It has been determined previously that a suitable way to model the non-rigid deformations due to brain shift is via a biomechanical model that treats the brain as a homogeneous, isotropic, linear elastic solid. This work extends that model-based non-rigid registration algorithm to take into account the underlying white matter structure, derived from diffusion tensor MRI, to more accurately model the brain. Experiments performed on retrospective surgical cases were used to evaluate the results of the registration algorithm in comparison to the earlier model. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Tensors

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Needle insertion in CT scanner with image overlay -cadaver studies

Needle insertion in CT scanner with image overlay -cadaver s...

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medical image computing and computer-assisted intervention, MICCAI 2004 - 7th international conference, Proceedings

作者： Fichtinger, Gabor Deguet, Anton Masamune, Ken Balogh, Emese Fischer, Gregory Mathieu, Herve Taylor, Russell H. Fayad, Laura M. Zinreich, S. James Johns Hopkins University Baltimore MD United States Tokyo Denki University Japan

An image overlay system is presented to assist needle placement in conventional CT scanners. The device consists of a flat LCD display and a half mirror and is mounted on the gantry. Looking at the patient through the mirror, the CT image appears to be floating inside the patient with correct size and position, thereby providing the physician with two-dimensional "X-ray vision" to guide needle placement procedures. The physician inserts the needle following the optimal path identified in the CT image that is rendered on the LCD and thereby reflected in the mirror. The system promises to increase needle placement accuracy and also to reduce X-ray dose, patient discomfort, and procedure time by eliminating faulty insertion attempts. We report cadaver experiments in several clinical applications with a clinically applicable device. © Springer-Verlag Berlin Heidelberg 2004.

关键词： computerized tomography

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Construction of 3D dynamic statistical deformable models for complex topological shapes

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medical image computing and computer-assisted intervention, MICCAI 2004 - 7th international conference, Proceedings

作者： Horkaew, Paramate Yang, Guang-Zhong Royal Society/Wolfson Foundation MIC Laboratory Department of Computing Imperial College of Science Technology and Medicine London SW7 2BZ United Kingdom

ISBN: (纸本)3540229760

This paper describes the construction of 3D dynamic statistical deformable models for complex topological shapes. It significantly extents the existing framework in that surfaces with higher genus can be effectively modeled. Criteria based on surface conformality and minimum description length is used to simultaneously identify the intrinsic global correspondence of the training data. The proposed method requires neither surface partitioning nor artificial grids on the parameterization manifold. The strength of the method is demonstrated by building a statistical model of the complex anatomical structure of the left side of human heart that includes the left ventricle, left atrium, aortic outflow tract, and pulmonary veins. The analysis of variance and leave-one-out-cross-validation indicate that the derived model not only captures physiologically plausible modes of variation but also is robust and concise, thus greatly enhancing its potential clinical value. © Springer-Verlag Berlin Heidelberg 2004.

关键词： medical imaging

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Augmenting intraoperative 3D ultrasound with preoperative models for navigation in liver surgery

Augmenting intraoperative 3D ultrasound with preoperative mo...

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7th international conference on medical image computing and computer-assisted intervention, MICCAI 2004

作者： Lange, Thomas Eulenstein, Sebastian Hünerbein, Michael Lamecker, Hans Schlag, Peter-Michael Department of Surgery and Surgical Oncology Charité - Universitary Medicine Berlin Germany Zuse Institute Berlin Germany

ISBN: (纸本)3540229779

Organ deformation between preoperative image data and the patient in the OR is the main obstacle for using surgical navigation systems in liver surgery. Our approach is to provide accurate navigation via intraoperative 3D ultrasound. These ultrasound data are augmented with preoperative anatomical models and planning data as an important additional orientation aid for the surgeon. We present an overview of the whole ultrasound navigation system as well as an approach for fast intraoperative non-rigid registration of the preoperative models to the ultrasound volume. The registration method is based on the vessel center lines and consists of a combination of the Iterative Closest Point algorithm and multilevel B-Splines. Quantitative results for three different patients are presented. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Navigation systems

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Cardiac motion extraction using 3D surface matching in Multislice Computed Tomography

Cardiac motion extraction using 3D surface matching in Multi...

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medical image computing and computer-assisted intervention, MICCAI 2004 - 7th international conference, Proceedings

作者： Simon, Antoine Garreau, Mireille Boulmier, Dominique Coatrieux, Jean-Louis Breton, Herve Le LTSI INSERM U642 Campus de Beaulieu 35042 Rennes France Centre Cardio-Pneumologique CHU Pontchaillou 35033 Rennes France

A new generation of Multislice Computed Tomography (MSCT) scanners, which allows a complete heart coverage and offers new perspectives for cardiac kinetic evaluation, is becoming widely available. A new method has been developed for the left ventricle motion analysis from dynamic MSCT images. It is based on a 3D surface matching process applied to left cavity volumes. It provides 3D velocity fields which can express contraction or expansion movements. First results obtained on real data show that MSCT imaging could be of great clinical interest for cardiac applications. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Feature extraction

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Velocity based segmentation in phase contrast MRI images

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medical image computing and computer-assisted intervention, MICCAI 2004 - 7th international conference, Proceedings

作者： Solem, Jan Erik Persson, Markus Heyden, Anders School of Technology and Society Malmö University Sweden

ISBN: (纸本)3540229760

Phase contrast MRI is a relatively new technique that extends standard MRI by obtaining flow information for tissue in the human body. The output data is a velocity vector field in a three-dimensional (3D) volume. This paper presents a method for 3D segmentation of blood vessels and determining the surface of the inner wall using this vector field. The proposed method uses a variational formulation and the segmentation is performed using the level set method. The purpose of this paper is to show that it is possible to perform segmentation using only velocity data which would indicate that velocity is a strong cue in these types of segmentation problems. This is shown in experiments. A novel vector field discontinuity detector is introduced and used in the variational formulation. The performance of this measure is tested with satisfactory results. © Springer-Verlag Berlin Heidelberg 2004.

关键词： image segmentation

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Fast non-linear elastic registration in 2D medical image

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medical image computing and computer-assisted intervention, MICCAI 2004 - 7th international conference, Proceedings

作者： Long, Zhi-Ying Yao, Li Peng, Dan-Ling School of Psychology Beijing Normal University Beijing 100088 China Department of Electronics Beijing Normal University Beijing 100088 China

ISBN: (纸本)3540229760

Non-linear image registration can match two images' local areas exactly. Linear elastic model that obeys the Navier-stokes equilibrium equations is especially fit for image registration with small deformation. Bro-Nielesen derived a linear elastic convolution filter from the eigenfunctions of the Navier-stokes differential operator. Based on the elastic filter, the elastic partial differential equation (PDE) is easy to be solved although the filter is mainly used in viscous PDE of fluid model at first. Gaussian filter used in the 'demon'-based registration method of Thrion could be regarded as an approximation to the elastic filter. Because of the complexity of the elastic filter and the poor performance of the gaussian filter, we propose a new simple filter, two-sided exponential filter, to approach the elastic filter. The results of experiments also show the new filter improves the algorithm's convergence speed and the precision greatly and its performance is superior to the other two filters. © Springer-Verlag Berlin Heidelberg 2004.

关键词： medical imaging

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Temporal lobe epilepsy surgical outcome prediction

Temporal lobe epilepsy surgical outcome prediction

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medical image computing and computer-assisted intervention, MICCAI 2004 - 7th international conference, Proceedings

作者： Duchesne, Simon Bernasconi, Neda Bernasconi, Andrea Collins, D. Louis McGill Univ. Montréal H3A 2B4 Canada

We wished to study pre-operative T1-weighted MRI of intractable temporal lobe epilepsy (TLE) patients who had undergone selective amygdala- hippocarnpectomy as part of their surgical treatment. We performed a voxel-based morphometry study of gray and white matter (GM,WM) concentration changes by comparing TLE patients with positive and negative surgical outcome. GM concentration changes were primarily located in the left lateral temporal neocortical region, while more extensive changes were found in left lateral temporal and occipital WM. Using those areas to define a region of interest, we showed that mean GM and WM concentration for all voxels within that region can be used to predict surgical outcome with 97% accuracy. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Magnetic resonance imaging

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Validation of dynamic heart models obtained using non-linear registration for virtual reality training, planning, and guidance of minimally invasive cardiac surgeries

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medical image ANALYSIS 2004年第3期8卷 387-401页

作者： Wierzbicki, M Drangova, M Guiraudon, G Peters, T John P Robarts Res Inst Imaging Res Labs London ON N6A 5K8 Canada Univ Western Ontario Dept Med Biophys London ON N6A 5C1 Canada CSTAR London ON N6A 5A5 Canada

Current minimally invasive techniques for beating heart surgery are associated with three major limitations: the shortage of realistic and safe training methods, the process of selecting port locations for optimal target coverage from X-rays and angiograms, and the sole use of the endoscope for instrument navigation in a dynamic and confined 3D environment. To supplement the current surgery training, planning and guidance methods, we continue-to develop our Virtual Cardiac Surgery Planning environment (VCSP) - a virtual reality, patient-specific, thoracic cavity model derived from 3D pre-procedural images. In this work, we create and validate dynamic models of the heart and its components. A static model is first generated by segmenting one of the image frames in a given 4D data set. The dynamics of this model are then extracted from the remaining image frames using a non-linear, intensity-based registration algorithm with a choice of six different similarity metrics. The algorithm is validated on an artificial CT image set created using an excised porcine heart, on CT images of canine subjects, and on MR images of human volunteers. We found that with the appropriate choice of similarity metric, our algorithm extracts the motion of the epicardial surface in CT images, or of the myocardium, right atrium, right ventricle, aorta, left atrium, pulmonary arteries, vena, cava and epicardial surface in MR images, with a root mean square error in the I rum range. These results indicate that our method of modeling the motion of the heart is easily adaptable and sufficiently accurate to meet the requirements for reliable cardiac surgery training, planning, and guidance. (C) 2004 Elsevier B.V. All rights reserved.

关键词： deformable models non-linear image registration registration validation pre-interventional planning image-guided surgery

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Foveal algorithm for the detection of microcalcification clusters: A FROC analysis

Foveal algorithm for the detection of microcalcification clu...

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7th international conference on medical image computing and computer-assisted intervention, MICCAI 2004

作者： Linguraru, Marius George Brady, Michael English, Ruth Medical Vision Laboratory University of Oxford Ewert House Ewert Place Summertown OxfordOX2 7BZ United Kingdom EPIDAURE Research Project INRIA 2004 route des Lucioles B.P. 93 Sophia Antipolis Cedex06902 France Breast Care Unit The Churchill Hospital OxfordOX3 9DU United Kingdom

ISBN: (纸本)3540229779

Clusters of microcalcifications are often the earliest signs of breast cancer and their early detection is a primary consideration of screening programmes. We have previously presented a method to detect microcalcifications based on normalised images in standard mammogram form (SMF) using a foveal segmentation algorithm. In this paper, we discuss the selection and computation of parameters, which is a key issue in automatic detection methods. Deriving the parameters of our algorithm from image characteristics makes the method robust and essentially removes its dependence on parameters. We carry out a FROC analysis to study the behaviour of the algorithm on images prior to normalisation, as well as the contribution of the stages employed by our method. We report results from two different image databases. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Parameter estimation

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