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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3761-3770 订阅

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A novel image similarity measure for registration of 3-D MR images and X-ray projection images 5th

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

作者： Rohlfing, Torsten Maurer, Calvin R. Image Guidance Laboratories Department of Neurosurgery Stanford University 300 Pasteur Drive MC 5327 StanfordCA94305-5327 United States

ISBN: (纸本)3540442251

Most existing methods for registration of three-dimensional tomographic images to two-dimensional projection images use simulated projection images and either intensity-based or feature-based image similarity measures. This paper suggests a novel class of similarity measures based on probabilities. We compute intensity distributions along simulated rays through the 3-D image rather than ray sums. Using a finite state machine, we eliminate background voxels from the 3-D image while preserving voxels from air filled cavities and other low-intensity regions that are part of the imaged object (e.g., bone in MRI). The resulting tissue distributions along all rays are compared to the corresponding pixel intensities of the real projection image by means of a probabilistic extension of histogram-based similarity measures such as (normalized) mutual information. Because our method does not compute ray sums, its application, unlike DRR-based methods, is not limited to X-ray CT images. In the present paper, we show the ability of our similarity measure to successfully identify the correct position of an MR image with respect to a set of orthogonal DRRs computed from a co-registered CT image. In an initial evaluation, we demonstrate that the capture range of our similarity measure is approximately 40mm with an accuracy of approximately 4 mm. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Magnetic resonance imaging

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Validation of image segmentation and expert quality with an expectation-maximization algorithm 1

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

作者： Warfield, Simon K. Zou, Kelly H. Wells, William M. Computational Radiology Laboratory and Surgical Planning Laboratory Harvard Medical School and Brigham and Women’s Hospital 75 Francis St. BostonMA02115 United States

ISBN: (数字)9783540457862

ISBN: (纸本)9783540457862

Characterizing the performance of image segmentation approaches has been a persistent challenge. Performance analysis is important since segmentation algorithms often have limited accuracy and precision. Interactive drawing of the desired segmentation by domain experts has often been the only acceptable approach, and yet suffers from intra-expert and inter-expert variability. Automated algorithms have been sought in order to remove the variability introduced by experts, but no single methodology for the assessment and validation of such algorithms has yet been widely adopted. The accuracy of segmentations of medical images has been difficult to quantify in the absence of a "ground truth" segmentation for clinical data. Although physical or digital phantoms can help, they have so far been unable to reproduce the full range of imaging and anatomical characteristics observed in clinical data. An attractive alternative is comparison to a collection of segmentations by experts, but the most appropriate way to compare segmentations has been unclear. We present here an Expectation-Maximization algorithm for computing a probabilistic estimate of the "ground truth" segmentation from a group of expert segmentations, and a simultaneous measure of the quality of each expert. This approach readily enables the assessment of an automated image segmentation algorithm, and direct comparison of expert and algorithm performance. © Springer-Verlag Berlin Heidelberg 2002.

关键词： image segmentation

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Transrectal prostate biopsy inside closed mri scanner with remote actuation, under real-time image guidance 1

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

作者： Fichtinger, Gabor Krieger, Axel Susil, Robert C. Tanacs, Attila Whitcomb, Louis L. Atalar, Ergin Engineering Research Center Johns Hopkins University BaltimoreMD United States Department of Radiology Johns Hopkins University BaltimoreMD United States Dept. of Biomedical Engineering Johns Hopkins University BaltimoreMD United States Department of Mechanical Engineering Johns Hopkins Univ BaltimoreMD United States

ISBN: (数字)9783540457862

ISBN: (纸本)9783540457862

We present the proof-of-concept prototype of a prostate biopsy robot to be used inside a conventional high-field MRI scanner. A three degree-offreedom (DOF) mechanical device translates and rotates inside the rectum and enters a needle into the body, and steers the needle to a target point pre-selected by the user. The device is guided by real-time images from the scanner. Networked computers process the medical images and enable the clinician to control the motion of the mechanical device that is operated remotely from outside the imager. The system is also applicable to localized prostate therapy and also demonstrates potential in other intra-cavitary procedures. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Needles

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Preoperative analysis of optimal imaging orientation in fluoroscopy for voxel-based 2-D/3-D registration 5th

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

作者： Nakajima, Yoshikazu Tamura, Yuichi Sato, Yoshinobu Tashiro, Takahito Sugano, Nobuhiko Yonenobu, Kazuo Yoshikawa, Hideki Ochi, Takahiro Tamura, Shinichi Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine SuitaOsaka565-0871 Japan Division of Computer Integrated Orthopaedic Surgery Osaka University Graduate School of Medicine SuitaOsaka565-0871 Japan Department of Orthopaedic Surgery Osaka University Graduate School of Medicine SuitaOsaka565-0871 Japan Osaka Minami National Hospital KawachinaganoOsaka586-8521 Japan

ISBN: (纸本)3540442251

We have developed a system for the 3-D localization of anatomical structures without the need for surgical exposure by using multiple-view fluoroscopy images. In this paper, we describe the system and evaluate its application to the estimation of optimal imaging orientations in fluoroscopy. For positional measurement, a voxel-based 2-D/3-D registration technique was employed. Since the measurement condition depends on the object shape, spatial distribution of X-ray absorption, and overlap of organs or structures (which differs at each imaging position), determining the optimal combination of fluoroscopy orientations is significant. We propose a system for preoperative determination of the optimal imaging orentation by using the accuracy estimation of stereo localization from single-plane localization results. In an experiment, the computation time needed was 10 hours, which was about 14 times shorter than the time required for a full search of imaging orientation combinations. © Springer-Verlag Berlin Heidelberg 2002.

关键词： X ray absorption

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Statistical 2D and 3D shape analysis using Non-Euclidean metrics

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

作者： Larsen, Rasmus Hilger, Klaus Baggesen Wrobel, Mark C. Informatics and Mathematical Modelling Technical University of Denmark Richard Petersens Plads Building 321 Kgs. LyngbyDK-2800 Denmark

ISBN: (纸本)3540442251

The contribution of this paper is the adaptation of data driven methods for non-Euclidean metric decomposition of tangent space shape coordinates. This basic idea is to take extend principal components analysis to take into account the noise variance at different landmarks and at different shapes. We show examples where these non-Euclidean metric methods allow for easier interpretation by decomposition into biologically meaningful modes of variation. The extensions to PCA are based on adaptation of maximum autocorrelation factors and the minimum noise fraction transform to shape decomposition. A common basis of the methods applied is the assessment of the annotation noise variance at individual landmarks. These assessments are based on local models or repeated annotations by independent operators. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Principal component analysis

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

作者： Masumoto, Jun Sato, Yoshinobu Hori, Masatoshi Murakami, Takamichi Johkoh, Takeshi Nakamura, Hironobu Tamura, Shinichi Division of Interdisciplinary Image Analysis SuitaOsaka565–0871 Japan Department of Radiology Osaka University Graduate School of Medicine SuitaOsaka565–0871 Japan

ISBN: (纸本)3540442251

A new similarity measure for volume registration is proposed, which uses using the assumption that the joint distribution of a target tissue is known. This similarity measure is designed so that it can deal with the tissue slide that occurs at boundaries between the target tissue and other tissues. Pre-segmentation of the target tissue is unnecessary. We intend to apply the proposed measure to registering volumes acquired at different time-phases in dynamic CT scans of the liver using contrast materials. In order to derive the similarity measure, we first formulate the ideal case where the joint distributions of all the tissues are known, after which we derive the measure for a realistic case where only the joint distribution of the target tissue is *** applied the proposed measure experimentally to eight dynamic CT data sets of the liver. After describing a practical method for estimating the joint distribution of the liver from real CT data, we show that the problem of tissue slide is effectively dealt with using the proposed measure. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Tissue

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Navigation of high intensity focused ultrasound applicator with an integrated three-dimensional ultrasound imaging system 5th

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

作者： Sakuma, Ichiro Takai, Yuichi Kobayashi, Etsuko Inada, Hiroshi Fujimoto, Katsuhiko Asano, Tekehide Graduate School of Frontier Sciences The University of Tokyo 7-3-1 Hongo Bunkyok-kuTokyo113-8656 Japan Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyok-kuTokyo113-8656 Japan Toshiba Medical Systems Company 1385 Ogami OhtawaraTochigi324-8550 Japan 2nd Department of Surgery Chiba University School of Medicine 1-8-1 Inohana Chuo-ku Chiba CityChiba260-8670 Japan

ISBN: (纸本)3540442251

A three-dimensional ultrasound imaging system was integrated in a HIFU applicator. This makes it easy to register the focal position of the HIFU applicator in the obtained three-dimensional volume data by three-dimensional ultrasound imaging system. The applicator was mounted on a mechanical manipulator with three degrees of freedom. The HIFU probe was positioned according to the volume data of the tissue around the target obtained by the ultrasound imaging system. A phantom study was conducted to evaluate the accuracy of navigation. Navigation errors were within 3 mm. It could also detect the monitor the change in acoustic properties of tissue due to HIFU application. The system uses history of HIFU application during therapy can be recorded in the system to assist appropriate manipulation of the probe by surgeons. The developed system is a simple, a cost-effective, and compact device for minimally invasive liver surgery. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Tissue

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Integrated approach for matching statistical shape models with intra-operative 2D and 3D data 5th

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

作者： Fleute, M. Lavallée, S. Desbat, L. PRAXIM 4 Av. Obiou La Tronche38 700 France TIMC Laboratory University Joseph Fourier Grenoble France

ISBN: (纸本)3540442251

This paper presents an approach to the problem of intraoperative reconstruction of 3D anatomical surfaces. The method is based on the integration of intra-operatively available shape and image data of different dimensionality such as 3D scattered point data, 2.5D ultra sound data, X-ray images etc. by matching them to a statistical shape model, thus providing the surgeon with a complete surface representation of the object of interest. Previous papers of the authors describe the matching of either 3D or 2D data to a statistical model and clinical applications. The here presented work combines former published ideas with a new approach for the complex task of shape analysis required for the computation of the statistical model, thus providing a generic approach for intra-operative surface reconstruction based on statistical models. The method for shape extraction/analysis is based on a generic model of the object and is used to segment training shapes and to establish point to point correspondence simultaneously in a set of CT images. Reconstruction experiments are performed on a statistical model of lumbar vertebrae. Results are provided for 3D/3D, 2D/3D and hybrid matching with simulated data and for 3D/2D matching for a cadaveric spine. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Surface reconstruction

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3D analysis of the alignment of the lower extremity in high tibial osteotomy 5th

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

作者： Kawakami, Hideo Sugano, Nobuhiko Nagaoka, Takashi Hagio, Keisuke Yonenobu, Kazuo Yoshikawa, Hideki Ochi, Takahiro Hattori, Asaki Suzuki, Naoki Department of Computer Integrated Orthopaedics Osaka Univ. Graduate School of Medicine 2-2 Yamadaoka Suita-shi Osaka565-0871 Japan Department of Orthopaedic Surgery Osaka Univ. Graduate School of Medicine 2-2 Yamadaoka Suita-shi Osaka565-0871 Japan Department of Orthopaedic Surgery Osaka-Minami National Hospital 2-1 Kidohigashimachi Kawachinagano-shiOsaka586-0008 Japan Institute for High Dimensional Medical Imaging Jikei Univ.School of Medicine 4-11-1 Izumi Honcho Komae-shiTokyo Japan Graduate School of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku-kuTokyo Japan

ISBN: (纸本)3540442251

The alignment of the lower extremities after high tibial osteotomy (HTO) varies widely on the radiographs. It is difficult to assess the rotation change on the radiographs. We developed computer software to calculate the alignment of the lower extremities and to simulate HTO. The purpose of this study is to compare and evaluate the variance in the femoro-tibial angle (FTA) and hip-knee-ankle angle (HKA) in relation to rotational shift of the lower extremity on radiographs and to clarify how the rotational shift affects the FTA and HKA by using three-dimensional (3D) CT simulation software for HTO. The mean absolute rotation angle of the lower extremity position on radiographs was 7.8 degrees, ranging from an external rotation of 8 degrees to an internal rotation of 14 degrees. Within the same range of rotation, the mean change in the FTA was 3.7 degrees, the mean change in the HKA was 1.5 degrees. © Springer-Verlag Berlin Heidelberg 2002.

关键词： computer software

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A method for detecting undisplayed regions in virtual colonoscopy and its application to quantitative evaluation of fly-through methods 5th

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

作者： Hayashi, Yuichiro Mori, Kensaku Hasegawa, Jun-Ichi Suenaga, Yasuhito Toriwaki, Jun-Ichiro Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku NagoyaAichi464-8603 Japan Image Guidance Laboratories Dept. of Neurosurgery Stanford University 300 Pasteur Drive StanfordCA94305-5327 United States School of Computer and Cognitive Sciences Chukyo University 101 Tokodachi Kaizu-cho ToyotaAichi470-0393 Japan

ISBN: (纸本)3540442251

This paper shows a method for detecting regions that the system did not display during the fly-through of a virtual endoscope system (VES) and quantitative evaluation of undisplayed regions in virtual colonoscopy. When we use the VES as a diagnostic tool, especially as a tool for detecting colon polyps, a user often performs automated fly-through based on automatically generated paths. In the case of automated fly-through in the colon, there are some blind areas at the backs of folds. The aim of this study is to detect undisplayed regions during flythrough and to perform quantitative evaluation. After the fly-through, the system shows undisplayed regions and notifies the user of the existence of unobserved regions together with the rate of undisplayed regions. We evaluate various kinds of automated fly-through paths generated from medial axes of the colon and flattened views of the colon from the viewpoint of the rate of undisplayed regions. The experiment results show that about 30% of colon regions are classified as undisplayed regions by the conventional automated fly-through along the medial axis and that the flattened view results in very few undisplayed regions. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Endoscopy

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