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STEPS - An application for simulation of transsphenoidal endonasal pituitary surgery

STEPS - An application for simulation of transsphenoidal end...

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IEEE visualization 2004 - proceedings, VIS 2004

作者： Neubauer, André Mroz, Lukas Wolfsberger, Stefan Wegenkittl, Rainer Forster, Marie-Thérèse Bühler, Katja VRVis Research Center Vienna Austria Department of Neurosurgery Medical University Vienna Austria Tiani Medgraph AG Brunn/Gebirge Austria

ISBN: (纸本)0780387880

Endonasal transsphenoidal pituitary surgery is a minimally invasive endoscopic procedure, applied to remove various kinds of pituitary tumors. To reduce the risk associated with this treatment, the surgeon must be skilled and well-prepared. Virtual endoscopy can be beneficial as a tool for training, preoperative planning and intraoperative support. This paper introduces STEPS, a virtual endoscopy system designed to aid surgeons in getting acquainted with the endoscopic view, the handling of instruments, the transsphenoidal approach and challenges associated with the procedure. STEPS also assists experienced surgeons in planning a real endoscopic intervention by getting familiar with the individual patient anatomy, identifying landmarks, planning the approach and deciding upon the ideal target position of the actual surgical activity. Besides interactive visualization using two different first-hit ray casting techniques, the application provides navigation and perception aids and the possibility to simulate the procedure, including haptic feedback and simulation of surgical instruments. ©2004 IEEE.

关键词： Flow visualization

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In-situ speech visualization in real-time interactive installation and performance 04

In-situ speech visualization in real-time interactive instal...

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proceedings NPAR 2004 - 3rd International symposium on Non-Photorealistic Animation and Rendering

作者： Levin, Golan Lieberman, Zachary Carnegie Mellon University College of Fine Arts CFA-300 5000 Forbes Avenue Pittsburgh PA 15213 United States Parsons School of Design Design Dept. 2 W. 13th Street New York City NY 10011 United States

ISBN: (纸本)9781581138870

Although we can sense someone's vocalizations with our ears, nose, and haptic sense, speech is invisible to us without the help of technical aids. In this paper, we present three interactive artworks which explore the question: "if we could see our speech, what might it look like?" The artworks we present are concerned with the aesthetic implications of making the human voice visible, and were created with a particular emphasis on interaction designs that support the perception of tight spatio-temporal relationships between sound, image, and the body. We coin the term in-situ speech visualization to describe a variety of augmented-reality techniques by which graphic representations of speech can be made to appear coincident with their apparent point of origination.

关键词： Interactive computer graphics

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Non-invasive interactive visualization of dynamic architectural environments 03

Non-invasive interactive visualization of dynamic architectu...

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acm siggraph 2003 symposium on Interactive 3D graphics

作者： Niederauer, Christopher Houston, Mike Agrawala, Maneesh Humphreys, Greg Univ. of California Santa Barbara Santa Barbara CA United States Stanford University Stanford CA United States University of Virginia Charlottesville VA United States

ISBN: (纸本)9781581136456

We present a system for interactively producing exploded views of 3D architectural environments such as multi-story buildings These exploded views allow viewers to simultaneously see the internal and external structures of such environments. To create an exploded view we analyze the geometry of the environment to locate individual stories. We then use clipping planes and multipass rendering to separately render each story of the environment in exploded form. Our system operates at the graphics driver level and therefore can be applied to existing OpenGL applications, such as first-person multi-player video games, without modification. The resulting visualization allows users to understand the global structure of architectural environments and to observe the actions of dynamic characters and objects interacting within such environments.

关键词： Interactive computer graphics

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Sort-first, distributed memory parallel visualization and rendering 03

Sort-first, distributed memory parallel visualization and re...

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IEEE symposium on Parallel and Large-Data visualization and graphics

作者： Bethel, EW Humphreys, G Paul, B Brederson, JD R3vis Corp Novato CA 94948 USA

ISBN: (纸本)078038122X

While commodity computing and graphics hardware has increased in capacity and dropped in cost, it is still quite difficult to make effective use of such systems for general-purpose parallel visualization and graphics. We describe the results of a recent project that provides a software infrastructure suitable for general-purpose use by parallel visualization and graphics applications. Our work combines and extends two technologies: Chromium, a stream-oriented framework that implements the OpenGL programming interface;and OpenRM Scene Graph, a pipelined-parallel scene graph interface for graphics data management, Using this combination we implement a sort-first, distributed memory, parallel volume rendering application. We describe the performance characteristics in terms of bandwidth requirements and highlight key algorithmic considerations needed to implement the sort-first system. We characterize system performance using a distributed memory parallel volume rendering application, and present performance gains realized by using scene specific knowledge to accelerate rendering by reducing network traffic. The contribution of this work is an exploration of general-purpose, sort-first architecture performance characteristics as applied to distributed memory, commodity hardware, along with a description of the algorithmic support needed to realize parallel, sort-first implementations.

关键词： distributed memory visualization parallel visualization parallel scene graph

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High-quality two-level volume rendering of segmented data sets on consumer graphics hardware 03

High-quality two-level volume rendering of segmented data se...

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IEEE visualization 2003 Conference

作者： Hadwiger, M Berger, C Hauser, H VRVis Research Center Austria

ISBN: (纸本)0780381203

One of the most important goals in volume rendering is to be able to visually separate and selectively enable specific objects of interest contained in a single volumetric data set, which can be approached by using explicit segmentation information. We show how segmented data sets can be rendered interactively on current consumer graphics hardware with high image quality and pixel-resolution filtering of object boundaries. In order to enhance object perception, we employ different levels of object distinction. First, each object can be assigned an individual transfer function, multiple of which can be applied in a single rendering pass. Second, different rendering modes such as direct volume rendering, iso-surfacing, and non-photorealistic techniques can be selected for each object. A minimal number of rendering passes is achieved by processing sets of objects that share the same rendering mode in a single pass. Third, local compositing modes such as alpha blending and MIP can be selected for each object in addition to a single global mode, thus enabling high-quality two-level volume rendering on GPUs.

关键词： volume rendering segmentation non-photorealistic rendering consumer graphics hardware

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Interactive visualization of unstructured grids using hierarchical 3D textures

Interactive visualization of unstructured grids using hierar...

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7th symposium on Volume visualization and graphics

作者： Leven, J Corso, J Cohen, J Kumar, S Johns Hopkins Univ Baltimore MD 21218 USA

ISBN: (纸本)0780376412

We present a system for interactively rendering large, unstructured grids. Our approach is to voxelize the grid into a 3D voxel octree, and then to render the data using hierarchical, 3D texture mapping. This approach leverages the current 3D texture mapping PC hardware for the problem of unstructured grid rendering. We specialize the 3D texture octree to the task of rendering unstructured grids through a novel pad and stencil algorithm, which distinguishes between data and non-data voxels. Both the voxelization and rendering processes efficiently manage large, out-of-core datasets. The system manages cache usage in main memory and texture memory, as well as bandwidths among disk, main memory, and texture memory. It also manages rendering load to achieve interactivity at all times. It maximizes a quality metric for a desired level of interactivity. It has been applied to a number of large data and produces high quality images at interactive, user-selectable frame rates using standard PC hardware.

关键词： Mapping

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Interactive visualization of unstructured grids using hierarchical 3D textures

Interactive visualization of unstructured grids using hierar...

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IEEE symposium on Volume visualization and graphics

作者： J. Leven J. Corso J. Cohen S. Kumar Johns Hopkins University USA

We present a system for interactively rendering large, unstructured grids. Our approach is to voxelize the grid into a 3D voxel octree, and then to render the data using hierarchical, 3D texture mapping. This approach leverages the Current 3D texture mapping PC hardware for the problem of unstructured grid rendering. We specialize the 3D texture octree to the task of rendering unstructured grids through a novel pad and stencil algorithm, which distinguishes between data and non-data voxels. Both the voxelization and rendering processes efficiently manage large, out-of-core datasets. The system manages cache usage in main memory and texture memory, as well as bandwidths among disk, main memory, and texture memory. It also manages rendering load to achieve interactivity at all times. It maximizes a quality metric for a desired level of interactivity. It has been applied to a number of large data and produces high quality images at interactive, user-selectable frame rates using standard PC hardware.

关键词： Hardware Data visualization Algorithm design and analysis Sampling methods Casting Large-scale systems Sorting Time factors Image quality Data structures

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Case study:: Parallel Lagrangian visualization applied to natural convective flows

Case study:: Parallel Lagrangian visualization applied to na...

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IEEE symposium on Parallel and Large-Data visualization and graphics

作者： de la Cruz, LM García, I Godoy, V Ramos, E Univ Nacl Autonoma Mexico Direcc Compp Invest DGSCA Mexico City 04510 DF Mexico

ISBN: (纸本)0780372239

This paper presents a visualization technique based on particle tracking. The technique consists in defining a set of points distributed on a closed surface and follow the surface deformations as the velocity field changes in time. Deformations of the surface contains information about dynamics of the flow;in particular, it is possible to identify zones where flow stretching and foldings occur. Because the points on the surface are independent each other, it is possible to calculate the trajectory of each point concurrently. Two parallel algorithms are studied;the first one for a shared memory Origin 2000 supercomputer and the second one for a distributed memory PC cluster. The technique is applied to a fluid moving by natural convection inside a cubic container.

关键词： Flow visualization particle traces pathlines shared and distributed memory

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Fast perception-based depth of field rendering 00

Fast perception-based depth of field rendering

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2000 acm symposium on Virtual Reality Software and Technology, VRST 2000

作者： Mulder, Jurriaan D. Van Liere, Robert Center for Mathematics and Computer Science Kruislaan 413 Amsterdam1098 SJ Netherlands

ISBN: (纸本)1581133162

Current algorithms to create depth of field (DOF) effects are either too costly to be applied in VII, systems, or they produce inaccurate results. In this paper, we present a new algorithm to create DOF effects. The algorithm is based on two techniques: one of high accuracy and one of high speed but less accurate. The latter is used to create DOF effects in the peripheral viewing area where accurate results are not necessary. The first is applied to the viewing volume focussed at by the viewer. Both techniques make extensive use of rendering hardware, for texturing as well as image processing. The algorithm presented in this paper is an improvement over other (fast) DOF algorithms in that it is faster and provides better quality DOF effects where it matters most. © acm 2000.

关键词： Virtual reality

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Dynamic view-dependent partitioning of structured grids with complex boundaries for object-order rendering techniques

Dynamic view-dependent partitioning of structured grids with...

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1999 IEEE symposium on Parallel visualization and graphics, PVGS 1999

作者： Burton, Lance C. Machiraju, Raghu Reese, Donna S. NSF Engineering Research Center for Computational Field Simulation Dept. of Computer Science Mississippi State University P.O. Box 9627 Mississippi StateMS39762 United States

ISBN: (纸本)1581132379

Object-order rendering techniques present an attractive approach to run-time visualization of structured grid data, particularly when combined with a parallel rendering paradigm such as image composition. The ability of this combination to exploit hardware exceeds that of parallel image order methods. However, certain configurations of grid boundaries prevent composition from being performed correctly. In particular, when the boundary between two partitions contains concave sections, the partitions may no longer be depth sorted correctly, a requirement for some visualization techniques such as direct volume rendering. This occurs because the concave boundary prevents even the simple ordering of two adjacent partitions. If the data may be repartitioned such that it can be depth sorted correctly, then an image composition approach is a viable option. To facilitate such an operation, we present an algorithm to analyze the geometric structure of a grid boundary and extract knowledge about how the boundary impacts depth sorting and therefore image composition. We then show through examples how this knowledge may be applied to create a set of partitions that may be properly depth sorted.

关键词： visualization

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