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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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Orthosis design system for malformed ears based on spline approximation 5th

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

作者： Hanafusa, Akihiko Isomura, Tsuneshi Sekiguchi, Yukio Takahashi, Hajime Dohi, Takeyoshi Department of Rehabilitation Engineering Polytechnic University 4-1-1 Hashimotodai SagamiharaKanagawa229-1196 Japan Department of Plastic Surgery Tokyo Metropolitan Toshima Hospital 33-1 Sakaemachi Itabashi-kuTokyo173-0015 Japan Graduate School of Information Science and Technology The University of Tokyo 7-3-1 Hongou Bunkyou-kuTokyo113-8654 Japan

ISBN: (纸本)3540442251

Malformed ears of neonates can be effectively treated by employing an orthosis of suitable shape. Currently, we use orthoses made of nitinol shape memory alloy wire and have developed a computer-assisted design system to manufacture the orthosis. Using this method, extracted contours of the helix and auriculotemporal sulcus are approximated to spline, and orthosis shape can be designed by moving the control points of spline with reference to control points of the target auricular shape. The system also functions to evaluate the contact force between the orthosis and auricle. Using this system, orthoses were designed and manufactured for 16 patients with malformed ears. Treatment was more effective in cases where it was necessary to extend the helix. © Springer-Verlag Berlin Heidelberg 2002.

关键词： computer aided design

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Simulation of the exophthalmia reduction using a finite element model of the orbital soft tissues 5th

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

作者： Luboz, Vincent Pedrono, Annaig Swider, Pascal Boutault, Frank Payan, Yohan Laboratoire TIMC-GMCAO UMR CNRS 5525 La Tronche38706 France INSERM Biomécanique CHU Purpan BP 3103 Toulouse Cedex 331026 France CHU Purpan Service de Chirurgie Maxillo-faciale Toulouse Cedex 331026 France

ISBN: (纸本)3540442251

This paper proposes a computer-assisted system for the surgical treatment of exophthalmia. This treatment is classically characterized by a decompression of the orbit, by the mean of an orbital walls osteotomy. The planning of this osteotomy consists in defining the size and the location of the decompression hole. A biomechanical model of the orbital soft tissues and its interactions with the walls are provided here, in order to help surgeons in the definition of the osteotomy planning. The model is defined by a generic Finite Element poro-elastic mesh of the orbit. This generic model is automatically adapted to the morphologies of four patients, extracted from TDM exams. Four different FE models are then generated and used to simulate osteotomies in the maxillary or ethmoid sinuses regions. Heterogeneous results are observed, with different backwards movements of the ocular globe according to the size and/or the location of the hole. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Histology

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

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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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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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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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A motion adaptable needle placement instrument based on tumor specific ultrasonic image segmentation 1

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

作者： Hong, Jae-Sung Dohi, Takeyoshi Hasizume, Makoto Konishi, Kozo Hata, Nobuhiko Environmental Studies Graduate School of Frontier Sciences The University of Tokyo 7-3-1 Hongo Bunkyo-kuTokyo113-8654 Japan Mechano-informatics Graduate School of Information Science and Technology The University of Tokyo 7-3-1 Hongo Bunkyo-kuTokyo113-8654 Japan Disaster and Emergency Medical Graduate School of Medical Sciences Kyushu University Maidashi 3-1-1 Higashi-kuFukuoka812-8582 Japan

ISBN: (数字)9783540457862

ISBN: (纸本)9783540457862

This paper suggests an ultrasound guided needle insertion instrument which can track target motion in real-time. Under traditional ultrasound guided needle insertion therapies, surgeons have had much burden to find out the precise targeting position, particularly when the organ is moving due to the respiration or heartbeat. We developed a new needle insertion instrument which can track moving target based on visual servo control. In addition, this paper proposed a tumor specific active contour model which can conduct a fast and robust segmentation for tumor, and utilized Hough transform for needle recognition. In the experiment, the proposed system could track a moving phantom successfully at speed of 3 frames/sec processing. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Tumors

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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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