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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Liang, JM McInerney, T Terzopoulos, D Turku Ctr Comp Sci Turku 20520 Finland Univ Toronto Dept Comp Sci Toronto ON M5S 3H5 Canada Ryerson Polytech Univ Dept Math Phys & Comp Sci Toronto ON M5B 2K3 Canada

ISBN: (纸本)354066503X

Snakes have become a standard image analysis technique with several variants now in common use. We have developed a software package called "United Snakes". It unifies the most important snake variants, including finite difference, B-spline, and Hermite polynomial snakes, within the framework of a general finite element formulation with a choice of shape functions. Furthermore, we have incorporated into united snakes a recently proposed snake-like technique known as "livewire", via a method for imposing hard constraints on snakes. Here, we demonstrate that the combination of techniques in united snakes yields generality, accuracy, ease of use, and robustness in several medical image analysis applications, including the segmentation of neuronal dendrites in EM images, dynamic chest image analysis, and the quantification of growth plates.

关键词： image analysis

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Automatic reconstruction of 3D geometry using projections and a geometric prior model 2nd

Automatic reconstruction of 3D geometry using projections an...

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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Lötjönen, J Magnin, IE Reinhardt, L Nenonen, J Katila, T Helsinki Univ Technol Biomed Engn Lab FIN-02015 Helsinki Finland Inst Natl Sci Appl 502 Creatis F-69621 Villeurbanne France Univ Helsinki Cent Hosp Biomag Lab FIN-00029 Helsinki Finland

ISBN: (纸本)354066503X

A method has been developed to reconstruct 3D surfaces from two orthogonal X-ray projections. A 3D geometrical prior model, composed of triangulated surfaces, is deformed according to contours segmented from projection images. the contours are segmented by a new method based on free-form deformation. First, virtual X-ray images of the prior model are constructed by simulating real X-ray imaging, thereafter, the contours segmented from the virtual projections are elastically matched with patient data. Next, the produced 2D vectors are back-projected onto the surface of the prior model and the prior model is deformed using the back-projected vectors with shape-based interpolation. the accuracy of the method is validated by it data set, containing 20 cases. the method is applied to reconstruct thorax and lung surfaces. the average matching error is about 1.2 voxels, corresponding to 5 mm.

关键词： image reconstruction

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Level-set surface segmentation and fast cortical range image tracking for computing intrasurgical deformations 2nd

Level-set surface segmentation and fast cortical range image...

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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Audette, MA Siddiqi, K Peters, TM McGill Univ Montreal Neurol Inst Montreal PQ Canada McGill Univ McGill Ctr Intelligent Machines Montreal PQ Canada John P Robarts Res Inst London ON N6A 5K8 Canada

ISBN: (纸本)354066503X

We propose a method for estimating intrasurgical brain shift for image-guided surgery. this method consists of five stages: the identification of relevant anatomical surfaces within the MRI/CT volume, range-sensing of the skin and cortex in the OR, rigid registration of the skin range image with its MRI/CT homologue, non-rigid motion tracking over time of cortical range images, and lastly, interpolation of this surface displacement information over the whole brain volume via a realistically valued finite element model of the head. this papers focuses on the anatomical surface identification and cortical range surface tracking problems. the surface identification scheme implements a recent algorithm which imbeds 3D surface segmentation as the level-set of a 4D moving front. A by-product of this stage is a Euclidean distance and closest point map which is later exploited to speed up the rigid and non-rigid surface registration. the range-sensor uses both laser-based triangulation and defocusing techniques to produce a 2D range profile, and is linearly swept across the skin or cortical surface to produce a 3D range image. the surface registration technique is of the iterative closest point type, where each iteration benefits from looking up, rather than searching for, explicit closest point pairs. these explicit point, pairs in turn are used in conjunction with a closed-form SVD-based rigid transformation computation and with fast recursive splines to make each rigid and non-rigid registration iteration essentially instantaneous. Our method is validated with a novel deformable brain-shaped phantom, made. of Polyvinyl Alcohol Cryogel.

关键词： Magnetic resonance imaging

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3D functional database of subcortical structures for surgical guidance in image guided stereotactic neurosurgery 2nd

3D functional database of subcortical structures for surgica...

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2nd international conference on medical image computing and computer-assisted intervention (MICCAI 99)

作者： Finnis, KW Starreveld, YP Parrent, AG Sadikot, AF Peters, TM Univ Western Ontario John P Robarts Res Inst London ON N6A 5K8 Canada London Hlth Sci Ctr London ON Canada McGill Univ Montreal Neurol Inst Montreal PQ Canada

ISBN: (纸本)354066503X

Current techniques for deep brain stereotactic neurosurgery require identification of targets by preoperative imaging localization. Many critical structures targeted in this way (the thalamic nuclei) are functionally distinct but not discernable on magnetic resonance images. these structures are also surrounded by critical brain areas which must not be damaged by the surgical procedure. these factors make accurate localization of lesion targets crucial. Digitized anatomical atlases derived from histochemically stained brain specimens registered to patient MRI datasets aid in delineating targets but accuracy of registration within-homogeneous anatomy remains questionable. To address this problem, we have designed a searchable and expandable database of functional organization for the sensorimotor thalamus, internal capsule, and internal pallidum from a population of patients (n=40). Data were obtained through microcellular recording, microstimulation, and macrostimulation mapping performed during stereotactic thalamotomies and pallidotomies. After registration of the database into standard stereotactic space, clustering of like physiological responses was noted in the internal capsule and sensorimotor thalamus and an articulated joint-based organization was observed in the internal pallidum. Furthermore, a clear delineation of the kinesthetic-paresthetic functional border was observed within the thalamus. When registered to a patient MR,I within our image guided visualization platform, the database provides a visual representation of deep brain functional organization facilitating physiological exploration and preoperative planning.

关键词： Magnetic resonance imaging

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Can MRI replace a second look operation in cholesteatoma surgery?

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ACTA OTO-LARYNGOLOGICA 1999年第5期119卷 555-561页

作者： Vanden Abeele, D Coen, E Parizel, PM Van de Heyning, P Univ Antwerp Dept Otorhinolaryngol Head & Neck Surg B-2020 Antwerp Belgium Univ Antwerp Dept Radiol B-2020 Antwerp Belgium

the purpose of this rarer is to investigate whether;a magnetic resonance imaging (MRI) examination of the petrous bonrs could replace the conventional second look surgical procedure when a canal wall up tympanoplasty procedure has been performed during the first look surgery. Eighteen patients were examined with MRI prior to a second look surgical procedure. MRI was performed on a 1.5 T superconducting system. T2 weighted images before contrast and T1 weighted images after contrast (gadopentate: dimeglumine) were obtained. Imaging results a ere compared with surgical findings. the poor radiosurgical correlation (50%! and 61% after re-evaluation) suggests that, at the present time, MRI is not a valid alternative to a second look surgical intervention in thr case of cholesteatoma treated by canal wall up tympanoplasty. In our study. MRI was not capable of differentiating small pearls of residual cholestratoma from surrounding scar tissue.

关键词： cholesteatoma magnetic resonance imaging middle ear pathology second look intervention

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AcouStick: A tracked a-mode ultrasonography system for registration in image-guided surgery 2nd

AcouStick: A tracked a-mode ultrasonography system for regis...

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2nd international conference on medical image computing and computer-assisted intervention, MICCAI 1999

作者： Maurer, Calvin R. Gaston, Ronald P. Hill, Derek L. G. Gleeson, Michael J. Taylor, M. Graeme Fenlon, Michael R. Edwards, Philip J. Hawkes, David J. Departments of Neurological Surgery and Biomedical Engineering University of Rochester 601 Elmwood Avenue Box 670 RochesterNY14642 United States Division of Radiological Sciences and Medical Engineering King’s College London 5th Floor Thomas Guy House Guy’s Hospital LondonSE1 9RT United Kingdom Department of Surgery King’s College London Guy’s Hospital London United Kingdom Department of Prosthetic Dentistry King’s College London Guy’s Hospital London United Kingdom

ISBN: (纸本)354066503X

In this paper, we describe a system for noninvasively determining bone surface points using an optically tracked A-mode ultrasound transducer. We develop and validate a calibration method;acquire cranial surface points for a skull phantom, three volunteers, and one patient;and register these points to surfaces extracted from CT images of the phantom and patient. Our results suggest that the bone surface point localization error of this system is less than 0.5 mm. the target registration error (TRE) of the cranial surface-based registration for the skull phantom was computed by using as a reference gold standard the point-based registration obtained with eight bone-implanted markers. the mean TRE for a 150-surface-point registration is 1.0 mm, and ranges between 1.0 and 1.7 mm for six 25-surface-point registrations. Our preliminary results suggest that accurate, noninvasive, image-tophysical registration of head images may be possible using an A-mode ultrasound-based system. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Phantoms

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the perception of transparency in medical images 2nd

The perception of transparency in medical images

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2nd international conference on medical image computing and computer-assisted intervention, MICCAI 1999

作者： Kasrai, Reza Kingdom, Frederick A. A. Peters, Terry M. McConnell Brain Imaging Ctr Montreal Neurological Inst H3A 2B4 Canada McGill Vision Research Unit Royal Victoria Hospital MontrealH3A 1A1 Canada Imaging Research Labs Robarts Research Institute LondonN6A 5K8 Canada

ISBN: (纸本)354066503X

Many of the tasks performed by clinicians during surgical planning or diagnosis relyon the visualization of medical images. When information from multiple modalities is integrated, some images must be seen through others. In these cases, surfaces or volumetric images are rendered semi-opaque, or transparent. It is necessary, therefore, to understand the nature of transparencyp erception in human visual system. A set of experiments is presented which begins to look at the role of stereoscopy, spatial frequency, and multiple layers in the perception of transparent achromatic surfaces. An adjustment technique has been developed for the measurement of observer performance, and a physical and algebraic model for the perception of multiple transparent surfaces is described. the results show good agreement with the models developed. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Stereo image processing

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the application accuracy of the frameless implantable marker system and analysis of related affecting factors 1st

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1st international conference on medical image computing and computer-assisted intervention (MICCAI 98)

作者： Li, QH Zamorano, L Jiang, ZW Vinas, F Diaz, F Wayne State Univ Dept Neurol Surg Detroit MI 48201 USA

ISBN: (纸本)3540651365

the purpose of this study was to determine the application accuracy of a new frameless marker system for interactive intraoperative localization of intracranial lesions. the influenca of image quality, registration error, repeatability, and marker distribution on the application accuracy were analyzed and compared, A phantom was mounted with the standard Z-D ring and also implanted with frameless marker system, which randomly distributed on the surface. the phantom was scanned as routine with I mm and 2 mm sections. the pixel sizes were used 1.18 x 1.18 and 0.59 x 0.59. the two systems were tested under different image quality and registration. the target point was digitized and the coordinates were recorded and compared with reference points. the difference between two systems were tested with paired t-test. image data were loaded into a SUN Workstation and registered with NSPS.4.0 software. the coordinate of each fiducial marker was recorded into a file as the reference. the tip of each semi-invasive fiducial marker was digitized to achieve a frameless transformation matrix, and the special points on the Z-D ring were digitized to achieve a frame-based transformation matrix. the differences from the reference points were used as the deviation From "true point". the mean square root (RMS) was calculated to show the sum of vectors. the results of 2 mm section group showed that the registration error of frame-based system is 3.42 +/- 0.22 mm and the error of the frameless system is 1.01 +/- 0.63 mm(P<0.001). the RMS are 2.57 +/- 0.54 mm and 1.53 +/- 0.65 mm respectively (P < 0.001). the RMS of error registration (one point off 5 mm) are 5.01 +/- 0.26 mm and 2.23 +/- 0.13 mm respective (P=0.003). the results of 1mm section group showed that the RMS are 1.20 +/- 0.42 mm and 0.90 +/- 0.47 mm respectively (P=0.121). the higher the quality (the thinner scan thickness) of image it is, the better the application accuracy will be (P=0.001 and 0.032 respectively). these preli

关键词： image guided surgery application accuracy stereotactic surgery frameless and frame based systems

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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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medical image computing and computer-assisted intervention − MICCAI 2017 1

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丛书名： Lecture Notes in computer Science

1000年

作者： Maxime Descoteaux Lena Maier-Hein Alfred Franz Pierre Jannin D. Louis Collins Simon Duchesne

ISBN: (数字)9783319661858

ISBN: (纸本)9783319661841

the three-volume set LNCS 10433, 10434, and 10435 constitutes the refereed proceedings of the 20th international conference on medical image computing and computer-assisted intervention, MICCAI 2017, held inQuebec City, Canada, in September 2017.;the 255 revised full papers presented were carefully reviewed and selected from 800 submissions in a two-phase review process. the papers have been organized in the following topical sections: Part I: atlas and surface-based techniques; shape and patch-based techniques; registration techniques, functional imaging, connectivity, and brain parcellation; diffusion magnetic resonance imaging (dMRI) and tensor/fiber processing; and image segmentation and modelling. Part II: optical imaging; airway and vessel analysis; motion and cardiac analysis; tumor processing; planning and simulation for medical interventions; interventional imaging and navigation; and medical image computing. Part III: feature;extraction and classification techniques; and machine learning in medical image computing.

关键词： image Processing and computer Vision Artificial Intelligence Probability and Statistics in computer Science Pattern Recognition Health Informatics

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