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

共 4110 条记录，以下是4011-4020 订阅

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An experimental image guided surgery simulator for hemicricolaryngectomy and reconstruction by tracheal autotransplantation 1st

引用

1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Schutyser, Filip Van Cleynenbreugel, Johan Poorten, Vincent Vander Delaere, Pierre Marchal, Guy Suetens, Paul K. U. Leuven Belgium Departement of Oto-Rhino Laryngology Head and Neck Surgery University Hospitals of Leuven Herestraat 49 LeuvenB-3000 Belgium

ISBN: (纸本)3540651365

In this paper we describe the current state of our surgical planning environment for a conservation method for unilateral glottic cancer with significant subglottic extension. The latter consists of a hemicricolaryngectomy and subsequent reconstruction of the laryngeal defect with a transferable patch of revascularized cervical trachea. In order to restore the three crucial functions of the larynx: airway patency, speech and swallowing, such a tracheal patch has to meet a typical surgical constraint (so-called paramedian position at glottic level). As such constraints are difficult to realise intraoperatively, we designed an image-based surgery simulator for the application. The planning environment visualizes medical image volumes (3D surfaces of the anatomy of interest together with multiplanar reslices) and takes specific surgical constraints into account. The guidance of the surgeon through the planning is menu-driven. To partly test our hypothesis that postoperative morphological results can be optimized by 3D planning, a cadaver study was set up. We report on both the planning environment and on the results of this study. © Springer-Verlag Berlin Heidelberg 1998.

关键词： medical imaging

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Model tags: Direct 3D tracking of heart wall motion from tagged MR images 1st

引用

1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Young, Alistair A. Department of Anatomy with Radiology University of Auckland Private Bag 92019 Auckland New Zealand

ISBN: (纸本)3540651365

A method is presented for the reconstruction of 3D heart wall motion directly from tagged magnetic resonance (MR) images, without prior identification of ventricular boundaries or tag stripe locations. Model tags were created as material surfaces which defined the location of the magnetic tags within the model. image-derived forces acted on the model tags, while the model could also be manipulated by a small number of user-controlled guide points. The method was applied to simulated images in which the true motion was specified, as well as to clinical images of a normal volunteer. The RMS errors in displacement and strain calculated from the simulated images were similar to those obtained using previous stripe tracking and model fitting methods. A significant improvement in analysis time was obtained for the normal volunteer, making the method more clinically viable. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Magnetic resonance

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A novel approach for the registration of 2D portal and 3D CT images for treatment setup verification in radiotherapy 1st

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1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Bansal, Ravi Staib, Lawrence H. Chen, Zhe Rangarajan, Anand Knisely, Jonathan Nath, Ravinder Duncan, James S. Departments of Electrical Engineering and Diagnostic Radiology Yale University New HavenCT06520-8042 United States Department of Therapeutic Radiology Yale University New HavenCT06520-8042 United States

ISBN: (纸本)3540651365

In this paper we present a framework to simultaneously segment portal images and register them to 3D treatment planning CT data sets for the purpose of radiotherapy setup verification. Due to the low resolution and low contrast of the portal image, taken with a high energy treatment photon beam, registration to the 3D CT data is a difficult problem. However, if some structure can be segmented in the portal image, it can be used to help registration, and if there is an estimate of the registration parameters, it can help improve the segmention of the portal image. The minimax entropy algorithm proposed in this paper evaluates appropriate entropies in order to segment the portal image and to find the registration parameters iteratively. The proposed algorithm can be used, in general, for registering a high resolution image to a low resolution image. Finally, we show the proposed algorithm’s relation to the mutual information [19] metric proposed in the literature for multi-modality image registration. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Radiotherapy

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A comparison of similarity measures for use in 2D-3D medical image registration 1st

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1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Penney, Graeme P. Weese, Jürgen Little, John A. Desmedt, Paul Hill, Derek L. G. Hawkes, David J. Division of Radiological Sciences UMDS Guy’s and St Thomas’ Hospitals LondonSEI 9RT United Kingdom Philips Research Hamburg Rontgenstraße 24-26 Hamburg22335 Germany EasyVision Advanced Development Philips Medical Systems Veenpluis 4-6 P. O. Box 10.000 Best5680 DA Netherlands

ISBN: (纸本)3540651365

A comparison of six similarity measures for use in intensity based 2D-3D image registration is presented. The accuracy of the similarity measures are compared to a "gold-standard" registration which has been accurately calculated using fiducial markers. The similarity measures are used to register a CT scan to a fluoroscopy image of a spine phantom. The registration is carried out within a region of interest in the fluoroscopy image which is user defined to contain a single vertebra. Many of the problems involved in this type of registration are caused by features which were not modelled by a phantom image alone. More realistic "gold standard" data sets were simulated using the phantom image with clinical image features overlaid. Results show that the introduction of soft tissue structures and interventional instruments into the phantom image can have a large effect on the performance of some similarity measures previously applied to 2D-3D image registration. Two measures were able to register accurately and robustly even when soft tissue structures and interventional instruments were present as differences between the images. These measures are called pattern intensity and gradient difference. © Springer-Verlag Berlin Heidelberg 1998.

关键词： computerized tomography

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Non-linear cerebral registration with sulcal constraints 1st

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1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Collins, D. Louis Le Goualher, Georges Evans, Alan C. McConnell Brain Imaging Centre Montréal Neurological Institute McGill University Montréal Canada

ISBN: (纸本)3540651365

In earlier work [1], we demonstrated that cortical registration could be improved on simulated data by using blurred, geometric, image-based features (Lvv) or explicitly extracted and blurred sulcal traces on simulated data. Here, the technique is modified to incorporate sulcal ribbons in conjunction with a chamfer distance objective function to improve registration in real MRI data as well. Experiments with 10 simulated data sets demonstrate a 56% reduction in residual sulcal registration error (from 3. 4 to 1. 5mm, on average) when compared to automatic linear registration and an 28% improvement over our previously published non-linear technique (from 2. 1 to 1. 5mm). The simulation results axe confirmed by experiments with real MRI data from young normal subjects, where sulcal misregistration is reduced by 20% (from 5. 0mm to 4. 0mm) and 11% (from 4. 5 to 4. 0mm) over the standard linear and nonlinear registration methods, respectively. © Springer-Verlag Berlin Heidelberg 1998.

关键词： image enhancement

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Automatically finding optimal working projections for the endovascular coiling of intracranical aneurysms 1st

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1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Wilson, Dale Noble, J. Alison Royston, Duncan Byrne, James Dept of Engineering Science University of Oxford OxfordOX1 3PJ United Kingdom Dept of Neuroradiology Radcliffe Infirmary OxfordOX2 6HE United Kingdom

ISBN: (纸本)3540651365

The endovascular coil embolisation of intracranial saccular aneurysms requires a set of specific X-ray images with which to view the aneurysm during coiling. These two-dimensional images, known as working projections should be optimal for measuring the aneurysm sac diameter, inserting the first coil, and checking coil overhang into the surrounding vessels. At present the gantry angle that produces these images is found by the radiologist by trial and error. In this paper we present a method for automatically finding the angles that will produce the desired X-ray projections. Our method consists of four steps: (1) segmenting the vasculature from three-dimensional angiographic data;(2) locating the aneurysm neck;(3) labelling the aneurysm sac;and (4) determining the optimal angle for viewing the aneurysm during coiling. We discuss details of the algorithm steps and present the results of the algorithm applied to one synthetic and two pathological examples. © Springer-Verlag Berlin Heidelberg 1998.

关键词： medical imaging

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Multimodality imaging for epilepsy diagnosis and surgical focus localization: Three-dimensional image correlation and dual isotope SPECT 1st

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1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Brinkmann, Benjamin H. Robb, Richard A. O’Brien, Terence J. O’Connor, Michael K. Mullan, Brian P. Biomedical Imaging Resource Dept of Neurology and Dept of Nuclear Medicine Mayo Foundation RochesterMN55905 United States

ISBN: (纸本)3540651365

Peri-ictal SPECT is a potentially powerful tool to study changes in regional cerebral blood flow during a partial seizure and to localize the seizure focus for pre-surgical evaluation. Recently we have developed and validated a method for co-registering and normalizing 3D interictal SPECT images to 3D ictal SPECT images and deriving a difference image co-registered to the patient's 3D MRI. This method has been shown to significantly improve clinical outcomes in surgery patients. In order to improve the method's sensitivity and specificity a number of enhancements have been added to the basic technique, including using voxel-based registration to better alignictal and interictal images, dual isotope (Tc-99m and 1-123) SPECT for effective tissue discrimination, and a custom software interface written to facilitate the entire process. We report results that show significant improvement over the original method, and we discuss future work which should continue to improve the method as a clinical tool. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Isotopes

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Real-time registration of 3D cerebral vessels to x-ray angiograms 1st

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1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Kita, Yasuyo Wilson, Dale L. Noble, J. Alison Electrotechnical Laboratory Ibaraki305-8568 Japan University of Oxford OxfordOX1 3PJ United Kingdom

ISBN: (纸本)3540651365

A quick method to obtain the 3D transformation of a 3D freeform shape model from its 2D projection data is proposed. This method has been developed for the real-time registration of a 3D model of a cerebral vessel tree, obtained from pre-operative data (eg. MR Angiogram), to a X-ray image of the vessel (eg. Digital Subtraction Angiogram) taken during an operation. First, the skeleton of the vessel in a 2D image is automatically extracted in a model-based way using a 2D projection of a 3D model skeleton at the initial state (up to ±20 degree difference in rotation). Corresponding pairs of points on the 3D skeleton and points on the 2D skeleton are determined based on the 2D Euclidean distance between the projection of the model skeleton and the observed skeleton. In the process, an adaptive search region for each model point, which is determined according to the projected shape, effectively removes incorrect correspondences. Based on a good ratio of correct pairs, linearization of a rotation matrix can be used to rapidly calculate the 3D transformation of the model which produces the 2D observed projection. Experiments using real data show the practical usefulness of the method. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Augmented reality

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computer-aided planning of patellofemoral joint OA surgery: Developing physical models from patient MRI 1st

引用

1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Cohen, Zohara A. McCarthy, Denise M. Roglic, Hrvoje Henry, Jack H. Rodkey, William G. Steadman, J. Richard Mow, Van C. Ateshian, Gerard A. Department of Mechanical Engineering Columbia University 500 W 120th St New YorkNY10027 United States Orthopaedic Research Laboratory Department of Orthopaedic Surgery Columbia-Presbyterian Medical Center 630 West 168th St New YorkNY10032 United States Department of Radiology Columbia-Presbyterian Medical Center Milstein Hospital Building 3-248 New YorkNY10032 United States Steadman-Hawkin Sports Medicine Foundation 181 W. Meadow Drive Suite 1000 VailCO81657 United States

ISBN: (纸本)3540651365

Generally, the surgical procedures employed in the treatment of patellofemoral joint (PFJ) osteoarthritis (OA) aim, either explicitly or implicitly, to alter the biomechanics of the osteoarthritic joint (i. e., improve motion and load transmission characteristics). Because of the mechanical nature of some of these surgical objectives, they can be evaluated prior to and subsequent to surgery by using an appropriate patient-specific physical model of the patient's PFJ, derived from 3D MRI data. This study describes the process by which such patient-specific physical models can be created using standard clinical imaging modalities. © Springer-Verlag Berlin Heidelberg 1998.

关键词： medical imaging

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2D+T acoustic boundary detection in echocardiography 1st

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1st international conference on medical image computing and computer-assisted intervention, MICCAI 1998

作者： Mulet-Parada, Miguel Noble, J. Alison Department of Engineering Science University of Oxford OxfordOX1 3PJ United Kingdom

ISBN: (纸本)3540651365

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 echocar-diographic segmentation, where choosing a single global intensity-based edge threshold is problematic. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Echocardiography

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