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"title": "Advanced Curved Planar Reformation: Flattening of Vascular Structures",
"date": "2003-05",
"abstract": "Traditional volume visualization techniques may provide incomplete clinical information needed for many\napplications in medical visualization. Especially in the area of vascular visualization important features\nsuch as the patent lumen of a diseased vessel segment may not be visible. Curved Planar Reformation (CPR)\nhas proven to be an acceptable practical solution. Existing CPR techniques, however, still have diagnostically\nrelevant limitations. In this paper we introduce two advanced methods for efficient vessel visualization,\nbased on the concept of CPR. Both methods benefit from relaxation of spatial coherence in favor of improved\nfeature perception. We present a new technique to visualize the interior of a vessel in a single image. A\nvessel is re-sampled along a spiral around the vessel central axis. The helical spiral depicts the vessel\nvolume. Furthermore, a method to display an entire vascular tree without mutually occluding vessels is\npresented. Minimal rotations around the branching points of a vessel tree eliminate occlusions. For each viewing\n direction the entire vessel structure is visible.",
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"title": "Nonlinear Virtual Colon Unfolding",
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"title": "CT angiography: Multi-path curved planar reformation of the peripheral arterial tree",
"date": "2003",
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"title": "Advanced Curved Planar Reformation: Flattering of Vascular Structures",
"date": "2003",
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"booktitle": "Proceedings of IEEE Visualization",
"editor": "G. Turk, J. van Wijk, K. Moorhead",
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"title": "CPR - Curved Planar Reformation",
"date": "2002-03",
"abstract": "Visualization of tubular structures such as blood vessels is an\nimportant topic in medical imaging. One way to display tubular\nstructures for diagnostic purposes is to generate longitudinal\ncross-sections in order to show their lumen, wall, and surrounding\ntissue in a curved plane. This process is called Curved Planar\nReformation (CPR). We present three different methods to generate\nCPR images. A tube-phantom was scanned with Computed Tomography (CT)\nto illustrate the properties of the different CPR methods. Furthermore\nwe introduce enhancements to these methods: thick-CPR, rotating-CPR\n \t\t and multi-path-CPR.",
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"title": "Christmas Tree Case Study: Computed Tomography as a Tool for Mastering Complex Real World Objects with Applications in Computer Graphics",
"date": "2002-03",
"abstract": "We report on using computed tomography (CT) as a model acquisition\ntool for complex objects in computer graphics. Unlike other modeling\nand scanning techniques the complexity of the object is irrelevant in\nCT, which naturally enables to model objects with, for example,\nconcavities, holes, twists or fine surface details. Once the data is\nscanned, one can apply post-processing techniques aimed at its further\nenhancement, modification or presentation. For demonstration purposes\nwe chose to scan a Christmas tree which exhibits high complexity which\nis difficult or even impossible to handle with other\ntechniques. However, care has to be taken to achieve good scanning\nresults with CT. Further, we illustrate the post-processing by means\nof data segmentation and photorealistic as well as non-photorealistic\n\t\t surface and volume rendering techniques.",
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"title": "Projected Slabs: Approximation of Perspective projection and Error Analysis",
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"title": "Endo View: A Phantom Study of a Tracked Virtual Bronchoscopy",
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"booktitle": "IEEE Visualization 2002",
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"id": "Vilanova-2001-VCU",
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"title": "Virtual Colon Unfolding",
"date": "2001-04",
"abstract": "The majority of virtual endoscopy techniques tries to simulate a\nreal endoscopy. A real endoscopy does not always give the optimal\ninformation due to the physical limitations it is subject to. In\nthis paper, we deal with the unfolding of the surface of the colon\nas a possible visualization technique for diagnosis and polyp\ndetection. A new two-step technique is presented which deals with\nthe problems of double appearance of polyps and nonuniform\nsampling that other colon unfolding techniques suffer from. In the\nfirst step, a distance map from a central path induces nonlinear\nrays for unambiguous parameterization of the surface. The second\nstep compensates for locally varying distortions of the unfolded\nsurface. A technique similar to magnification fields in\ninformation visualization is hereby applied. The technique\n produces a single view of a complete virtually dissected colon.",
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"title": "Peripheral Vessel Investigation For Routine Clinical Use",
"date": "2001-03",
"abstract": "This paper is about computed tomography angiography based vessel exploration.\nLarge image sequences of the lower extremities are investigated in a clinical\nenvironment. Two different approaches for peripheral vessel diagnosis dealing\nwith stenosis and calcification detection are introduced. The paper presents an\nautomated vessel-tracking tool for curved planar reformation. A user interactive\n segmentation tool for bone removal is proposed.",
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"note": "Proceedings of IEEE Visualization 2001, October 2001, San Diego, USA, pp. 91-98
",
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"title": "Virtual Colon Flattening",
"date": "2000-12",
"abstract": "We present a new method to visualize virtual endoscopic\nviews. We\npropose to flatten the organ by the direct projection of the\nsurface onto a set of cylinders. Two sampling strategies are\npresented and the introduced distortions are studied. A\nnon-photorealistic technique is presented to enhance the\nperception of the images. Finally, an approximate but real-time\nendoscopic fly-through is possible by using the data obtained by\n the projection technique.",
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"title": "Mastering Interactive Surface Rendering for Java-Based\nDiagnostic Applications",
"date": "2000-04",
"abstract": "The display of iso-surfaces in medical data sets is an\nimportant visualization\ntechnique used by radiologists for the diagnosis of volumetric density\ndata sets. The demands put by radiologists on such a display\ntechnique are interactivity, multiple stacked transparent surfaces and\ncutting planes that allow an interactive clipping of the\nsurfaces. This paper presents a Java based, platform independent\nimplementation of a very fast surface rendering algorithm which\ncombines the advantages of explicit surface representation, splatting,\nand\nshear-warp projection to fulfill all these requirements. The algorithm\nis\nimplemented within the context of J-Vision, an application for viewing\nand\ndiagnosing medical images which is currently in use at various\nhospitals.\n",
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"title": "Mastering Interactive Virtual Bronchioscopy on a Low--End PC",
"date": "2000-03",
"abstract": "Virtual endoscopy presents the cross-sectional acquired 3D-data of\na computer tomograph as an endoluminal view. The common approach\nfor the visualization of a virtual endoscopy is surface rendering,\nyielding images close to a real endoscopy. If external structures\nare of interest, volume rendering techniques have to be used.\nThese methods do not display the exact shape of the inner lumen\nvery well. For certain applications, e.g. operation planning of a\ntrans-bronchial biopsy, both, the shape of the inner lumen as well\nas outer structures like blood vessels and the tumor have to be\ndelineated. In this paper a method is described, that allows a\nquick and easy hybrid visualization using overlays of different\nvisualization methods like different surfaces or volume renderings\nwith different transfer functions in real time on a low-end PC. To\nachieve real time frame rates, image based rendering techniques\n have been used.",
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"title": "Visualization of Analytically Defined Dynamical Systems",
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"note": "In H. Hagen, G.M. Nielson, F. Post (eds.), Proceedings Dagstuhl'97, Scientific Visualization, IEEE Computer Society, 2000, pp. 71-82",
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"title": "Mastering Interactive Surface Rendering for Java-Based Diagnostic Applications",
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"note": "IEEE Visualization 2000 Proceedings, 2000, pp. 437-440",
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"title": "Visualization of Dynamical Systems.",
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"abstract": null,
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399
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"note": "F.Post, D. Silver (eds.) Journal Future Generation Computer Systems, Elsevier, Vol. 15(1), February 1999, pp.75-86.",
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"url": "https://www.cg.tuwien.ac.at/research/publications/1999/Groeller-1999-Vis/",
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{
"id": "Groeller-1998-VDS",
"type_id": "techreport",
"tu_id": null,
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"title": "Visualization of Dynamical Systems",
"date": "1998-02",
"abstract": "The visualization of analytically defined dynamical systems is\nimportant for a thorough understanding of the underlying system\nbehavior. An introduction to analytically defined dynamical\nsystems is given. Various visualization techniques for dynamical\nsystems are discussed. Several current research directions\nconcerning the visualization of dynamical systems are treated in\nmore detail. These are: texture based techniques, visualization\nof high-dimensional dynamical systems, advanced streamsurface\nrepresentations, local analysis - Poincare' sections,\n visualizing econometric models.",
"authors_et_al": false,
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"number": "TR-186-2-98-07",
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{
"id": "Groeller-1998-VAD",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Visualization of Analytically Defined Dynamical\nSystems",
"date": "1998-02",
"abstract": "The visualization of analytically defined dynamical systems is\nimportant for a thorough understanding of the underlying system\nbehavior. An overview of theoretical concepts concerning\nanalytically defined dynamical systems is given. Various\nvisualization techniques for dynamical systems are discussed.\nThree current research directions concerning the visualization of\ndynamical systems are treated in more detail. These are: texture\nbased techniques, visualization of high-dimensional dynamical\n systems, and advanced streamsurface representations. ",
"authors_et_al": false,
"substitute": null,
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"number": "TR-186-2-98-06",
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},
{
"id": "Groeller-1998-TunVis",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "TunVis: Visualizing specific geologic features for\ntunnel planning and construction",
"date": "1998-02",
"abstract": "This paper describes a method and a system for visualizing a\nvirtual tunnel through an existing geologic formation and a\nmethod for the generation of a camera animation along the tunnel\naxis. The tunnel is built from geologic data coming from vertical\nsample drills from the mountain top along the selected tunnel axis.\nIts wire frame model is then edited by a geologist and image\ninformation of the rock appearance is textured onto the tunnel\nwall, resulting in a photorealistic representation of the expected\ngeologic rock formations. Finally a camera animation and video\noptions are defined to render a video sequence of the camera\n movement.",
"authors_et_al": false,
"substitute": null,
"main_image": null,
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"authors": [
412,
165,
166
],
"number": "TR-186-2-98-08",
"pages_from": "1",
"pages_to": "12",
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"keywords": [
"visualization",
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"tunnel planning"
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{
"id": "Wegenkittl-97-FOL",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Fast Oriented Line Integral Convolution for Vector\n Field Visualization via the Internet",
"date": "1997-03",
"abstract": "Oriented Line Integral Convolution (OLIC) illustrates\nflow fields by convolving a sparse texture with an anisotropic\nconvolution kernel. The kernel is aligned to the underlying flow of\nthe vector field. OLIC does not only show the direction of the flow\nbut also its orientation. This paper presents Fast Rendering of Oriented\nLine Integral Convolution (FROLIC), which is approximately two orders of\nmagnitude faster than OLIC. Costly convolution operations as done in\nOLIC are replaced in FROLIC by approximating a streamlet through a set\nof disks with varying intensity. The issue of overlapping streamlets\nis discussed. Two efficient animation techniques for animating FROLIC\nimages are described. FROLIC has been implemented as a Java applet.\nThis allows researchers from various disciplines (typically with\ninhomogenous hardware environments) to conveniently explore and\ninvestigate analytically defined 2D vector fields.",
"authors_et_al": false,
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"authors": [
165,
166
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"number": "TR-186-2-97-07",
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"keywords": [
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},
{
"id": "Wegenkittl-97-VBH",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Visualizing the Behavior of Higher Dimensional\n Dynamical Systems",
"date": "1997-03",
"abstract": "In recent years scientific visualization has been\ndriven by the need to visualize high-dimensional data sets within\nhigh-dimensional spaces.\nHowever most visualization methods are designed for showing some\nstatistical features of the data set. This paper deals with the\nvisualization of trajectories of high-dimensional dynamical systems\nwhich form a L^n_n data set of a smooth n-dimensional flow. Three\nmethods that are based on the idea of parallel coordinates are\npresented and discussed. Visualizations done with these new methods\nare shown and an interactive visualization tool for the exploration\nof high-dimensional dynamical systems is proposed.",
"authors_et_al": false,
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"authors": [
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"number": "TR-186-2-97-08",
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"keywords": [
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"multi-dimension visualization"
],
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},
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"id": "Wegenkittl-thesis",
"type_id": "phdthesis",
"tu_id": null,
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"title": "Visualization of Complex Dynamical Systems",
"date": "1997",
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165
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166
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{
"id": "Wegenkittl-1996-AFR",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Animating Flowfields: Rendering of Oriented Line Integral\n\t\tConvolution",
"date": "1996-12",
"abstract": "Line Integral Convolution (LIC) is a common approach\nfor the visualization of vector fields. It is well suited for visualizing\nthe direction of a flow field, but it gives no information about the\norientation of the underlying vectors. We introduce Oriented Line Integral\nConvolution (OLIC), where direction as well as orientation are encoded\nwithin the resulting image. This is achieved by using a low frequency\ninput texture and a ramp like (unisotropic) convolution kernel. This\nmethod can be animated, whereby the computation of so called pixel traces\nfastens the calculation process. In the result section various OLICs using\nsimple and real-world vector fields are shown.",
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166,
190
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{
"id": "Wegenkittl-1996-SDI",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Simulation of Differential Interferometry and\n Comparison with Experimental Results",
"date": "1996-11",
"abstract": "This paper presents the computational simulation of a\ndifferential interferometer in a Mach-Zehnder arrangement\nwith objects located outside the center of the\ninterferometer. The computer simulation corresponds very\nwell to an experimental setup. This is illustrated for\nseveral basic phase objects. The theoretical models of\nthese objects are discussed. The concept of an interactive\nvisualization system for the analysis of phase objects is\npresented and finallysome results allowing a comparison\n between experimental and simulated interferograms are shown.",
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165,
166,
423
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"number": "TR-186-2-96-22",
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{
"id": "wegenkittl-1996-GTW",
"type_id": "techreport",
"tu_id": null,
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"title": "A Guided Tour to Wonderland: Visualizing the Slow-Fast\n Dynamics of an Analytical Dynamical System",
"date": "1996-04",
"abstract": "The analysis of complex dynamical systems produces large\namounts of data that have to be interpreted efficiently.\nVisualizing the phase space of such systems illustrates\ngeometrically the behavior of the underlying dynamics. This\nwork investigates the visualization of Wonderland, a four\ndimensional econometric model, which describes interactions\nbetween population growth, economic activity and\nenvironmental implications. Wonderland belongs to a class\nof interesting dynamical systems with a pronounced\nslow-fast dynamics, i.e., some variables are changing much\nfaster than others. Furthermore the behavior of the\nWonderland model is characterized by manifolds which are\nnot streamsurfaces, i.e., the flow does not stay within\nthese surfaces. This paper discusses the application and\nadaptation of various visualization techniques to\nanalytical dynamical systems with special properties as\n mentioned above.",
"authors_et_al": false,
"substitute": null,
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"authors": [
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190
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"number": "TR-186-2-96-11",
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"keywords": [
"vector field visualization",
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{
"id": "loeffelmann-1996-CVA",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Classifying the Visualization of Analytically Specified\n Dynamical Systems",
"date": "1996-04",
"abstract": "In this paper we suggest a classification of visualization\ntechniques for analytically specified dynamical systems\ninto four different approaches. We distinguish between local\nproperties, the topology of behavior, global properties, and\nclasses of dynamical systems with respect to various topics\nof visualization. By presenting advanced visualization\ntechniques that we applied during three recent projects, we\ndiscuss their embedding within the classification scheme The\ndynamical systems visualized are the ``Dynastic Cycle'',\nwhich is a model for rise and fall of dynasties in ancient\nChina, the ``Wonderland'' model, that simulates the\ninteractions of population growth, economic activities, and\nenvironmental pollution, and a model for mixed-mode\n oscillations, which occurs in chemistry. ",
"authors_et_al": false,
"substitute": null,
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"authors": [
399,
166,
165,
190
],
"number": "TR-186-2-96-15",
"pages_from": "1",
"pages_to": "14",
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"keywords": [
"visualization",
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{
"id": "Groeller-1995-GOW",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "The Geometry of Wonderland",
"date": "1995-12",
"abstract": "We analyze Wonderland - a model of demographic,economic\nand environmental interactions\n- by combining numerical simulations with basic ideas of\ngeometric singular perturbation theory. This theory dealing\nwith slow-fast dynamical systems helps us to gain new\ninsights into the system's behaviour. We give conditions\nfor the occurrence of rapid environmental changes in\nWonderland. Since the chosen approach is inherently geometric\n\t\twe also focus on the visualization of our results.",
"authors_et_al": false,
"substitute": null,
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"authors": [
166,
165,
417,
430,
431,
432
],
"number": "TR-186-2-95-17",
"pages_from": "1",
"pages_to": "21",
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"keywords": [
"dynamical system",
" visualization"
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{
"id": "Groeller-1994-IDN",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Interactive Design of Nonlinear Functions for\n Iterated Function Systems",
"date": "1994-08",
"abstract": "The basic requirement for the functions of an Iterated\nFunction System (IFS for short) is contractivity.\nNevertheless the majority of recent scientific investigations\nis concentrating on IFSs defined through a set of contractive\nlinear functions. Simpler handling of this kind of functions\nand a more predictable result is the main reason for this\napproach. In this work we use distorted grids (representing\nnonlinear functions) to specify an IFS with a higher degree\nof flexibility and a higher modelling capability. A program\nfor modeling these grids with so-called high-level operations\nis presented. Attention is directed to the interactivity of\ndesigning the IFS and rendering its limit set. Therefore a\nz-Buffer for displaying the result of a stochastic algorithm\nis included. Example images designed with the implemented\n\t\tsoftware system are presented.",
"authors_et_al": false,
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"authors": [
166,
165
],
"number": "TR-186-2-94-3",
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"nonlinear",
"interactive design",
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"url": "https://www.cg.tuwien.ac.at/research/publications/1994/Groeller-1994-IDN/",
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