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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3751-3760 订阅

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The effect of visual and haptic feedback on manual and teleoperated needle insertion 1

引用

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

作者： Gerovichev, Oleg Marayong, Panadda Okamura, Allison M. Department of Biomedical Engineering Johns Hopkins University BaltimoreMD United States Department of Mechanical Engineering Johns Hopkins University BaltimoreMD United States Engineering Research Center for Computer-Integrated Surgical Systems and Technology Johns Hopkins University BaltimoreMD United States

ISBN: (数字)9783540457862

ISBN: (纸本)9783540457862

In this paper, we present a study that evaluates the effect of visual and haptic feedbacks and their relevance to human performance in a needle insertion task. A virtual needle insertion simulator with a four-layer tissue model (skin, fat, muscle, and bone) and haptic feedback is used for perceptual experiments. The task was to detect the puncture of a particular layer using haptic and visual cues provided by the simulation. The results show that the addition of force feedback reduces error in detection of transitions between tissue layers by at least 55%. The addition of real-time visual feedback (image overlay) improved user performance by at least 87% in scenarios without force feedback. Presentation of both force and visual feedback improved performance by at least 43% in comparison to scenarios without feedback. These results suggest that real-time image overlay provides greater improvement in performance than force feedback. © Springer-Verlag Berlin Heidelberg 2002.

关键词： image enhancement

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A comparison of 2D-3D intensity-based registration and feature-based registration for neurointerventions 5th

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

作者： McLaughlin, Robert A. Hipwell, John Hawkes, David J. Alison Noble, J. Byrne, James V. Cox, Tim Medical Vision Laboratory Dept. Engineering Science University of Oxford Oxford United Kingdom CISG Division of Radiological Sciences Guy’s Hospital King’s College London London United Kingdom Department of Radiology Radcliffe Infirmary Oxford United Kingdom National Hospital for Neurology and Neurosurgery Queen Square London United Kingdom

ISBN: (纸本)3540442251

Registration of 2D-3D data can improve visualisation during minimally-invasive neurointerventions. Using four clinical data sets, we quantitatively compared two approaches: an intensity-based algorithm and a feature-based algorithm. The intensity-based approach was found to be more accurate, with an average registration accuracy of 1.4mm, compared to the feature-based algorithm with an average accuracy of 2.3mm. The intensity-based algorithm was also found to be more reliable. Reliability of the feature-based algorithm was found to be more sensitive to the complexity of the vasculature structure. © Springer-Verlag Berlin Heidelberg 2002.

关键词： medical imaging

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A prostate brachytherapy training rehearsal system -simulation of deformable needle insertion 1

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

作者： Kimura Nishitai, Asako Camp, Jon Robb, Richard Davis, Brian Graduate School of Engineering Science Osaka University 1-3 Machikaneyama-cho Toyonaka560-8531 Japan Biomedical Imaging Resource Mayo Foundation RochesterMN55902 United States Radiation Oncology Mayo Foundation RochesterMN55902 United States

ISBN: (数字)9783540457862

ISBN: (纸本)9783540457862

Prostate cancer is the most common cancer diagnosed in men in the United States. Prostate brachytherapy - an advanced radiotherapy cancer treatment in which radioactive seeds are placed directly in and around the prostate tissues - is complicated by tissue forces that tend to deflect the treatment needles from their intended positions. medical simulation has proven useful as a technique to enhance surgeons' training and procedure rehearsal. Therefore we are developing a brachytherapy simulation system that includes visual display and haptic feedback, with which a user can see and feel the procedure of the therapy. In this paper, we describe a deformable needle insertion simulation that is a part of our brachytherapy simulation system. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Radiotherapy

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"Gold standard 2D/3D" registration of X-ray to CT and MR images 5th

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

作者： Tomaevič, Dejan Likar, Boštjan Pernuš, Franjo University of Ljubljana Traška 25 Ljubljana1000 Slovenia

ISBN: (纸本)3540442251

Validation of registration techniques needed for image-guided surgery is an important problem, which received little attention in the literature. In this paper we address the challenging problem of generation of a reliable gold standard for evaluating the accuracy of surgical 2D/3D registrations. We have devised a cadaveric lumbar spine phantom with fiducial markers and established highly accurate correspondence between 3D CT and MR images and 18 2D X-ray images. The expected target registration errors are in the order of 0.2 mm for CT to X-ray registration and in the order of 0.3 mm for MR to X-ray registration. As such, the gold standard images, which are available on request from the authors, are useful for testing 2D/3D registration methods in image guided surgery. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Magnetic resonance imaging

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3D ultrasound system using a magneto-optic hybrid tracker for augmented reality visualization in laparoscopic liver surgery 5th

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

作者： Nakamoto, Masahiko Sato, Yoshinobu Miyamoto, Masaki Nakamjima, Yoshikazu Konishi, Kozo Shimada, Mitsuo Hashizume, Makoto Tamura, Shinichi Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine Japan Department of Disaster and Emergency Medicine Graduate School of Medical Science Kyushu University Japan Department of Surgery II Graduate School of Medical Science Kyushu University Japan

ISBN: (纸本)3540442251

A three-dimensional ultrasound (3D-US) system suitable for laparoscopic surgery that uses a novel magneto-optic hybrid tracker configuration. Our aim is to integrate 3D-US into a laparoscopic AR system. A 5D miniature magnetic tracker is combined with a 6D optical tracker outside the body to perform 6D tracking of a flexible US probe tip in the abdominal cavity. 6D tracking parameters at the tip are obtained by combining the 5D parameters at the tip inside the body, the 6D parameters at the US probe handle outside the body, and the restriction of the tip motion relative to the handle. The system was evaluated in comparison with a conventional 3D ultrasound system. Although the accuracy of the proposed system was somewhat inferior to that of the conventional one, both the accuracy and sweet spot area were found to be acceptable for clinical use. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Augmented reality

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Combinative multi-scale level set framework for echocardiographic image segmentation 1

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

作者： Lin, Ning Yu, Weichuan Duncan, James S. Department of Electrical Engineering Yale University PO Box 208042 New HavenCT06520-8042 United States Department of Diagnostic Radiology Yale University PO Box 208042 New HavenCT06520-8042 United States

ISBN: (数字)9783540457862

ISBN: (纸本)9783540457862

In the automatic segmentation of echocardiographic images, a priori shape knowledge is used to compensate poor features in ultrasound images. The shape knowledge is often learned via off-line training process, which requires tedious human effort and is unavoidably expertise-dependent. More importantly, a learned shape template can only be used to segment a specific class of images with similar boundary shapes. In this paper, we present a multi-scale level set framework for echo image segmentation. We extract echo image boundaries automatically at a very coarse scale. These boundaries are then not only used as boundary initials at finer scales, but also as an external constraint to guide contour evolutions. This constraint functions similar to a traditional shape prior. Experimental results validate this combinative framework. © Springer-Verlag Berlin Heidelberg 2002.

关键词： image segmentation

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Technical developments for MR-Guided microwave thermocoagulation therapy of liver tumors 5th

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

作者： Morikawa, Shigehiro Inubushi, Toshiro Kurumi, Yoshimasa Naka, Shigeyuki Sato, Koichiro Tani, Tohru Hata, Nobuhiko Seshan, Viswanathan Haque, Hasnine A. Molecular Neuroscience Research Center Shiga University of Medical Science Seta Tukinowa-cho OhtsuShiga520-2192 Japan 1st Dept of Surgery Shiga University of Medical Science Seta Tukinowa-cho OhtsuShiga520-2192 Japan Department of Neurosurgery Shiga University of Medical Science Seta Tukinowa-cho OhtsuShiga520-2192 Japan Graduate School of Information Science and Technology The University of Tokyo Hongo 7-3-1 Bunkyo-kuTokyo113-8656 Japan GE-Yokogawa Medical Systems 4-7-127 Asahigaoka HinoTokyo191-8503 Japan

ISBN: (纸本)3540442251

We have started clinical studies of MR-guided thermocoagulation therapy of liver tumors. Through this therapy for two years, we have developed new instruments, such as a filter to reduce noise in MRI from the microwave coagulator, a new MR-compatible electrode for easy detection of the tip position and an MR-compatible endoscopic system for trans-diaphragmatic approach to liver tumors just below the diaphragm. Concerning software, a program was modified for the real-time display of MR temperature map with a scale bar. A navigation software, 3D Slicer was customized to add real-time image navigation capability. The re-sliced images in the two perpendicular planes complemented the limitations of real-time MR image, which is taken in 2-3 seconds. These technical developments play important roles for more accurate, safer and easier treatment. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Magnetic resonance imaging

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3D respiratory motion compensation by template propagation 5th

引用

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

作者： Rösch, Peter Netsch, Thomas Quist, Marcel Weese, Jürgen Philips Research Laboratories Sector Technical Systems Röntgenstraße 24 HamburgD-22335 Germany MIMIT Advanced Development Philips Medical Systems Nederland B.V Veenpluis 4–6 DA BestNL-5680 Netherlands

ISBN: (纸本)3540442251

A new approach for the automatic estimation of dense 3D deformation fields is proposed. In the first step, template propagation (an advanced block matching strategy) produces not only a large set of point correspondences, but also a quantitative measure of the "registration quality" for each point pair. Subsequently, the deformation field is obtained by a method based on Wendland radial base functions. This method has been adapted to incorporate "registration quality" into regularization, where Morozov’s discrepancy principle has been applied to give intuitive meaning to the regularization parameter. The main advantage of the presented algorithm is the ability to perform an elastic registration in the presence of large deformations with minimum user interaction. Applying the method, complicated respiratory motion patterns in 3D MR images of the thorax have been successfully determined. The complete procedure takes less than one hour on a standard PC for MR image pairs (256×256×75 voxels) showing a 40 mm displacement of the diaphragm. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Motion compensation

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Discriminative analysis for image-based studies 1

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

作者： Golland, Polina Fischl, Bruce Spiridon, Mona Kanwisher, Nancy Buckner, Randy L. Shenton, Martha E. Kikinis, Ron Dale, Anders Grimson, W. Eric L. Artificial Intelligence Laboratory Massachusetts Institute of Technology CambridgeMA United States Athinoula A. Martinos Center for Biomedical Imaging Massachusetts General Hospital Harvard Medical School BostonMA United States Department of Brain and Cognitive Sciences Massachusetts Institute of Technology CambridgeMA United States Departments of Psychology Anatomy and Neurobiology and Radiology Washington University and Howard Hughes Medical Institute St. LouisMO United States Laboratory of Neuroscience Clinical Neuroscience Division Department of Psychiatry VAMC-Brockton Harvard Medical School BrocktonMA United States Surgical Planning Laboratory Brigham and Women’s Hospital Harvard Medical School BostonMA United States

ISBN: (数字)9783540457862

ISBN: (纸本)9783540457862

In this paper, we present a methodology for performing statistical analysis for image-based studies of differences between populations and describe our experience applying the technique in several different population comparison experiments. Unlike traditional analysis tools, we consider all features simultaneously, thus accounting for potential correlations between the features. The result of the analysis is a classifier function that can be used for labeling new examples and a map over the original features indicating the degree to which each feature participates in estimating the label for any given example. Our experiments include shape analysis of subcortical structures in schizophrenia, cortical thinning in healthy aging and Alzheimer’s disease and comparisons of fMRI activations in response to different visual stimuli. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Population statistics

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Specification method of surface measurement for surgical navigation: Ridgeline based organ registration 5th

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

作者： Furushiro, Naomichi Saito, Tomoharu Masutani, Yoshitaka Sakuma, Ichiro Department of Precision Engineering Graduate School of Engineering The University of Tokyo Hongo 7 3 1 BunkyoTokyo1138656 Japan Institute of Environmental Studies Graduate School of Frontier Sciences The University of Tokyo Hongo 7 3 1 BunkyoTokyo1130033 Japan Department of Radiology University of Tokyo Hongo 7 3 1 BunkyoTokyo1130033 Japan

ISBN: (纸本)3540442251

Surgical navigation for abdominal organs has difficulties, such as dynamic deformation, compared with other organs (i.e. brain, bone). Organ deformations prevent surgical navigators from performing accurate navigation based on preoperative information. We are studying on a method for deforming preoperative organ models so that the models are matched to intraoperative shapes. The method is based on the ICP (iterative closest point) algorithm and modal representation of shape deformation. In this paper, we describe preliminary experiments for rigid parameter estimation in the entire registration process, by using range data and surface model reconstructed from X-ray CT of a liver phantom. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Iterative methods

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