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检索条件"任意字段=8th International Conference on Medical Image Computing and Computer-Assisted Intervention"

共 2692 条记录，以下是2521-2530 订阅

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Interactive intra-operative 3D ultrasound reconstruction and visualization 5th

引用

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

作者： Gobbi, David G. Peters, Terry M. Imaging Research Laboratories John P. Robarts Research Institute University of Western Ontario LondonONN6A 5K8 Canada Department of Medical Biophysics University of Western Ontario LondonONN6A 5C1 Canada

ISBN: (纸本)3540442251

the most attractive feature of 2D B-mode ultrasound for intra-operative use is that it is both a real time and a highly interactive modality. Most 3D freehand reconstruction methods, however, are not fully interactive because they do not allow the display of any part of the 3D ultrasound image until all data collection and reconstruction is finished. We describe a technique whereby the 3D reconstruction occurs in real-time as the data is acquired, and where the operator can view the progress of the reconstruction on three orthogonal slice views through the ultrasound volume. Capture of the ultrasound data can be immediately followed by a straightforward, interactive nonlinear registration of a pre-operative MRI volume to match the intra-operative *** demonstrate the our system on a deformable, multi-modal PVA-cryogel phantom and during a clinical surgery. © Springer-Verlag Berlin Heidelberg 2002.

关键词： image reconstruction

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A combined statistical and biomechanical model for estimation of intra-operative prostate deformation 5th

引用

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

作者： Mohamed, Ashraf Davatzikos, Christos Taylor, Russell CISST NSF Engineering Research Center Department of Computer Science Johns Hopkins University United States Center for Biomedical Image Computing Department of Radiology Johns Hopkins University School of Medicine United States

ISBN: (纸本)3540442251

An approach for estimating the deformation of the prostate caused by transrectal ultrasound (TRUS) probe insertion is presented. this work is particularly useful during brachytherapy procedures, in which planning for radioactive seed insertion is performed on preoperative scans, and significant deformation of the prostate can occur during the procedure. the approach makes use of a patient specific biomechanical model to run simulations for TRUS probe insertion, extract the main modes of the deformation of the prostate, and use this information to establish a deformable registration between 2 orthogonal cross-sectional ultrasound images and the preoperative prostate. In the work presented here, the approach is tested on an anatomy-realistic biomechanical phantom for the prostate and results are reported for 5 test simulations. More than 73% of maximum deformation of the prostate was recovered, with the estimation error mostly attributed to the relatively small number of biomechanical simulations used for training. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Deformation

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An image overlay system with enhanced reality for percutaneous therapy performed inside CT scanner 5th

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

作者： Masamune, Ken Fichtinger, Gabor Deguet, Anton Matsuka, Daisuke Taylor, Russell College of Sciences and Engineering Tokyo Denki University Ishizaka Hatoyama Hiki Saitama350-0394 Japan Center for Computer Integrated Surgical Systems and Technology Johns Hopkins University MD21218 United States

ISBN: (纸本)3540442251

We describe a simple, safe, and inexpensive image overlay system to assist surgical interventions inside a conventional CT scanner. the overlay system is mounted non-invasively on the gantry of the CT scanner and it consists of a seven degrees-of-freedom passive mounting arm, a flat LCD display, and a light brown acrylic plate as a half mirror. In a pre-operative calibration process, the display, half-mirror, and imaging plane of the scanner are spatially registered by imaging a triangular calibration object. Following the calibration, the patient is brought into the scanner, an image is acquired and sent to the overlay display via DICOM transfer. Looking at the patient through the half-mirror, the CT image appears to be floating inside the patient in correct size and position. this vision enables the physician to see both the surface and the inside of the patient at the same time, which can be utilized in guiding a surgical intervention. the complete system fits into a carry-on suitcase (except the mounting adapter), it is easy to calibrate, mounts non-invasively on the scanner, without utilizing vendor-specific features of he scanner. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Mountings

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2D guide wire tracking during endovascular interventions 5th

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

作者： Baert, S. Niessen, W.J. Image Sciences Institute University Medical Center Utrecht P.O.Box 85500 UtrechtGA3508 Netherlands

ISBN: (纸本)3540442251

A method to extract and track the position of a guide wire during endovascular interventions under X-ray fluoroscopy is presented and evaluated. the method can be used to improve guide wire visualization in the low quality fluoroscopic images and to estimate the position of the guide wire in world coordinates. 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 a spline to a feature image in which line-like structures are enhanced. In the optimization step, the influence of the scale at which the feature is calculated is investigated. Also, the feature image is calculated both on the original image and on a preprocessed image in which coherent structures are enhanced. Finally, the influence of explicit endpoint detection is studied. the method is evaluated on 267 frames from 10 sequences. Using the automatic method, the guide wire could be tracked in 96% of the frames, with a greater accuracy than three observers. Endpoint detection improved the accuracy of the tip assessment, which was better than 1.3 mm. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Template matching

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

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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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Multi-modal image registration by minimising kullback-leibler distance 5th

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

作者： Chung, Albert C.S. Wells, William M. Norbash, Alexander Grimson, W. Eric L. Dept. of Computer Science Hong Kong University of Science and Technology Hong Kong Harvard Medical School Brigham and Women’s Hospital BostonMA United States MIT Artificial Intelligence Laboratory CambridgeMA United States

ISBN: (纸本)3540442251

In this paper, we propose a multi-modal image registration method based on the a priori knowledge of the expected joint intensity distribution estimated from aligned training images. the goal of the registration is to find the optimal transformation such that the discrepancy between the expected and the observed joint intensity distributions is minimised. the difference between distributions is measured using the Kullback-Leibler distance (KLD). Experimental results in 3D-3D registration show that the KLD based registration algorithm is less dependent on the size of the sampling region than the Maximum log-Likelihood based registration method. We have also shown that, if manual alignment is unavailable, the expected joint intensity distribution can be estimated based on the segmented and corresponding structures from a pair of novel images. the proposed method has been applied to 2D-3D registration problems between digital subtraction angiograms (DSAs) and magnetic resonance angiographic (MRA) image volumes. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Magnetic resonance

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Projection profile matching for intraoperative MRI registration embedded in MR imaging sequence

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

作者： Hata, Nobuhiko Tokuda, Junichi Morikawa, Shigeo Dohi, Takeyoshi Graduate School of Information Science and Technology The University of Tokyo Molecular Neuroscience Research Center Shiga University of Medical Science Japan

ISBN: (纸本)3540442251

Fast image registration for magnetic resonance image (MRI)-guided surgery using projection profile matching embedded in MR pulse sequence is proposed. the method can perform two-dimensional image registration by matching projection profiles acquired with zero-degree phase encoding. the matching process continuously measures displacement by optimizing cross correlation value from profiles acquired 64 times by a special pulse excitation and echo acquisition in one imaging cycle. A phantom experiment concluded that the method can perform the registration in 25ms with the accuracy of 0.50mm out of 100mm field of view. the paper also includes in-vivo experiment to registration MRI arm in motion. Unlike previously reported image registration by post-processing, the method is suitable in intraoperative setting where fast registration is in great need. © Springer-Verlag Berlin Heidelberg 2002.

关键词： image registration

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Finding a non-continuous tube by fuzzy inference for segmenting the MR Cholangiography image 5th

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

作者： Yasuba, Chihiro Kobashi, Syoji Kondo, Katsuya Hata, Yutaka Imawaki, Seturo Ishikawa, Makoto Graduate School of Engineering Himeji Institute of Technology Shosha Himeji2167 Japan Chairman of BISC Special Interest Group in Medical Imaging The University of California at Berkeley CA United States Ishikawa Hospital 784 Bessho Bessho-cho Himeji671-0221 Japan

ISBN: (纸本)3540442251

In medical images, the tube-formed tissues such as the blood vessels, the trachea, and the pancreatic duct are sometimes partially masked because of the constriction, stones in the vessels, the pancreatic cancer, etc. therefore, it is not easy to automatically segment the region of tubes (ROTs) from medical images for visualizing the structures by using conventional image segmentation methods, because inference of ROTs is difficult. In this paper, we propose a fuzzy rule-based augmented reality method for finding non-continuous ROTs. We can obtain the ROT without extracting it. the physicians’ procedure for finding the ROT can be eliminated by fuzzy inference techniques based on their knowledge. the employed knowledge is the intensity, the curve, and the radius of the ROTs. We apply the proposed method for finding the pancreatic duct from MR Cholangiography images. through experimental results, we show that this method can successfully find the pancreatic duct from any data sets and it can clearly visualize the 3D shape of the ROT in MIP images. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Augmented reality

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Simulation of intra-operative 3D coronary angiography for enhanced minimally invasive robotic cardiac intervention 5th

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

作者： Lehmann, G. Habets, D. Holdsworth, D.W. Peters, T. Drangova, M. The John P Robarts Research Institute The University of Western Ontario and the London Health Sciences Centre LondonON Canada

ISBN: (纸本)3540442251

A simulation environment has been developed to aid the development of three-dimensional (3D) angiographic imaging of the coronary arteries for use during minimally invasive robotic cardiac surgery. We have previously developed a dynamic model of the coronary arteries by non-linearly deforming a high-resolution 3D image of the coronaries of an excised human heart, based on motion information from cine bi-plane angiograms. the result was a sequence of volumetric images representing the motion of the coronary arteries throughout the cardiac cycle. To simulate different acquisition and gating strategies, we implemented an algorithm to forward project through the volume data sets. thus, radiographic projections corresponding to any view-angle, can be produced for any time-point throughout the cardiac cycle. Combining re-projections from selected time-points and view angles enables the evaluation of various gating strategies. this approach will allow us to determine the optimum image acquisition parameters to produce 3D coronary angiograms for planning and guidance of minimally invasive robotic cardiac surgery. © Springer-Verlag Berlin Heidelberg 2002

关键词： Heart

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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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