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CPR - curved planar reformation

CPR - curved planar reformation

引用

IEEE Conference on Visualization

作者： A. Kanitsar D. Fleischmann R. Wegenkittl P. Felkel E. Groller Institute of Computer Graphics and Algorithms University of Technology Vienna Austria Department of Radiology University of Technology Vienna Austria VRVis Research Center Vienna Austria

Visualization of tubular structures such as blood vessels is an important topic in medical imaging. One way to display tubular structures for diagnostic purposes is to generate longitudinal cross-sections in order to show their lumen, wall, and surrounding tissue in a curved plane. This process is called curved planar reformation (CPR). We present three different methods to generate CPR images. A tube-phantom was scanned with computed tomography (CT) to illustrate the properties of the different CPR methods. Furthermore we introduce enhancements to these methods: thick-CPR, rotating-CPR and multi-path-CPR.

关键词： Biomedical imaging Computed tomography Data visualization Magnetic resonance imaging Blood vessels Image generation computer graphics Radiology computer displays Chromium

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Moment curves

Moment curves

引用

Pacific (formerly Asia-Pacific APVIS) Visualization Symposium

作者： Daniel Patel Martin Haidacher Jean-Paul Balabanian Eduard M. Groller Christian Michelsen Research Bergen Norway Institute of Computer Graphics and Algorithms University of Technology Vienna Austria Department of Informatics University of Bergen Bergen Norway

We define a transfer function based on the first and second statistical moments. We consider the evolution of the mean and variance with respect to a growing neighborhood around a voxel. This evolution defines a curve in 3D for which we identify important trends and project it back to 2D. The resulting 2D projection can be brushed for easy and robust classification of materials and material borders. The transfer function is applied to both CT and MR data.

关键词： Transfer functions Histograms Image processing computer graphics Noise robustness Informatics Computed tomography Image segmentation Volume measurement Material properties

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Reciprocal shading for mixed reality

Reciprocal shading for mixed reality

引用

作者： Knecht, Martin Traxler, Christoph Mattausch, Oliver Wimmer, Michael Vienna University of Technology Institute of Computer Graphics and Algorithms Favoritenstrasse 9-11 A-1040 Vienna Austria VRVis Zentrum für Virtual Reality Visualisierung Forschungs-GmbH Donau-City-Strasse 1 A-1220 Vienna Austria University of Zurich Department of Informatics Binzmuehlestrasse 14 CH-8050 Zurich Switzerland

In this paper we present a novel plausible rendering method for mixed reality systems, which is useful for many real-life application scenarios, like architecture, product visualization or edutainment. To allow virtual objects to seamlessly blend into the real environment, the real lighting conditions and the mutual illumination effects between real and virtual objects must be considered, while maintaining interactive frame rates. The most important such effects are indirect illumination and shadows cast between real and virtual objects. Our approach combines Instant Radiosity and Differential Rendering. In contrast to some previous solutions, we only need to render the scene once in order to find the mutual effects of virtual and real scenes. In addition, we avoid artifacts like double shadows or inconsistent color bleeding which appear in previous work. The dynamic real illumination is derived from the image stream of a fish-eye lens camera. The scene gets illuminated by virtual point lights, which use imperfect shadow maps to calculate visibility. A sufficiently fast scene reconstruction is done at run-time with Microsofts Kinect sensor. Thus, a time-consuming manual pre-modeling step of the real scene is not necessary. Our results show that the presented method highly improves the illusion in mixed-reality applications and significantly diminishes the artificial look of virtual objects superimposed onto real scenes. © 2012 Elsevier Ltd.

关键词： Mixed reality

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Sampling step importance in hierarchical semantic segmentation of microscopic images

Sampling step importance in hierarchical semantic segmentati...

引用

International Conference on System Theory, Control, and Computing (ICSTCC)

作者： Cristian Smochina Vasile Manta Walter Kropatsch Department of Computer Science and Engineering Gheorghe Asachi Technical University of Iasi Romania Pattern Recognition and Image Processing Group Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

The objective of semantic segmentation in microscopic images is to extract the cellular, nuclear or tissue components. This problem is challenging due to the large variations of these components features (size, shape, orientation or texture). In this paper we improve the technique presented in [17] used to identify the epithelial nuclei (crypt) against interstitial nuclei in microscopic images taken from colon tissues. In the proposed enhanced approach, the crypt inner boundary is detected using the closing morphological pyramid instead of morphological hierarchy. The outer crypt border is determined by the epithelial nuclei, overlapped by the maximal isoline of the inner boundary. The use of sampling in building the pyramid offers computational efficiency, reduces the amount of used memory, increase the robustness and preserve the quality results. An analysis of the two approaches is performed considering the number of pixels processed to create each level. Also the relation between the levels of the hierarchical structures is established.

关键词： Cryptography Image segmentation Image reconstruction Image resolution Microscopy Buildings Shape

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Volume visualization based on statistical transfer-function spaces

Volume visualization based on statistical transfer-function ...

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Pacific (formerly Asia-Pacific APVIS) Visualization Symposium

作者： Martin Haidacher Daniel Patel Stefan Bruckner Armin Kanitsar M. Eduard Gröller Institute of Computer Graphics and Algorithms University of Technology Vienna Austria Christian Michelsen Research Bergen Norway AGFA-Gevaert N. V. Austria

ISBN: (纸本)9781424466856

It is a difficult task to design transfer functions for noisy data. In traditional transfer-function spaces, data values of different materials overlap. In this paper we introduce a novel statistical transfer-function space which in the presence of noise, separates different materials in volume data sets. Our method adaptively estimates statistical properties, i.e. the mean value and the standard deviation, of the data values in the neighborhood of each sample point. These properties are used to define a transfer-function space which enables the distinction of different materials. Additionally, we present a novel approach for interacting with our new transfer-function space which enables the design of transfer functions based on statistical properties. Furthermore, we demonstrate that statistical information can be applied to enhance visual appearance in the rendering process. We compare the new method with 1D, 2D, and LH transfer functions to demonstrate its usefulness.

关键词： Transfer functions Space technology computer graphics Data visualization Noise measurement White noise Medical services Algorithm design and analysis Rendering (computer graphics) Statistics

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Using Optimized Virtual Network Embedding for Network Dimensioning

Using Optimized Virtual Network Embedding for Network Dimens...

引用

International Conference and Workshops on Networked Systems (NetSys)

作者： Johannes Inführ David Stezenbach Matthias Hartmann Kurt Tutschku Günther R. Raidl Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Chair of Future Communication University of Vienna Austria Chair of Communication Networks University of Wuerzburg Germany

Virtual Network Embedding will be one of the key concepts of the Future Internet. For an ISP it is important to know how many additional Virtual Networks (VNs) of a specific application (e.g. web, streaming, P2P, and VoIP) are mappable into the current resource substrate with a certain probability. In this work we calculate this probability with our embedding algorithm which enables us to consider side effects based on remapping of VNs (e.g. due to reduced link delay). Our results show that minimal extra resources can significantly increase embedding probability of additional VNs.

关键词： Substrates Delays Routing Bandwidth Peer-to-peer computing Educational institutions Optimization

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HeartPad: Real-time visual guidance for cardiac ultrasound

HeartPad: Real-time visual guidance for cardiac ultrasound

引用

Workshop at SIGGRAPH Asia 2012, WASA 2012

作者： Ford, Steven T. Viola, Ivan Bruckner, Stefan Torp, Hans Kiss, Gabriel Norwegian University of Science and Technology MI Lab. Department of Circulation and Medical Imaging Trondheim Norway Høgskolen I Nord-Trøndelag Norway University of Bergen Norway Christian Michelsen Research Norway Institute of Computer Graphics and Algorithms Vienna University of Technology Austria St. Olavs Hospital Trondheim Norway

ISBN: (纸本)9781450318358

Medical ultrasound is a challenging modality when it comes to image interpretation. The goal we address in this work is to assist the ultrasound examiner and partially alleviate the burden of interpretation. We propose to address this goal with visualization that provides clear cues on the orientation and the correspondence between anatomy and the data being imaged. Our system analyzes the stream of 3D ultrasound data and in real-time identifies distinct features that are basis for a dynamically deformed mesh model of the heart. The heart mesh is composited with the original ultrasound data to create the data-to-anatomy correspondence. The visualization is broadcasted over the internet allowing, among other opportunities, a direct visualization on the patient on a tablet computer. The examiner interacts with the transducer and with the visualization parameters on the tablet. Our system has been characterized by domain specialist as useful in medical training and for navigating occasional ultrasound users. © 2012 ACM.

关键词： Visualization

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Computed tomography angiography: a case study of peripheral vessel investigation 01

Computed tomography angiography: a case study of peripheral ...

引用

IEEE Conference on Visualization

作者： A. Kanitsar D. Fleischmann R. Wegenkittl D. Sandner P. Felkel E. Groller Institute of Computer Graphics and Algorithms University of Technology Vienna Austria TIANI Medgraph Austria VRVis Center Vienna Austria Department of Radiology University of Technology Vienna Austria

ISBN: (纸本)0780372018

This paper deals with vessel exploration based on computed tomography angiography. Large image sequences of the lower extremities are investigated in a clinical environment. Two different approaches for peripheral vessel diagnosis dealing with stenosis and calcification detection are introduced. The paper presents an automated vessel-tracking tool for curved planar reformation. An interactive segmentation tool for bone removal is proposed.

关键词： Computed tomography Angiography computer aided software engineering Extremities Visualization Diseases computer graphics Radiology Image segmentation Bones

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Virtual dissection of the colon based on helical CT data-can it be done?

Virtual dissection of the colon based on helical CT data-can...

引用

International Symposium on Image and Signal Processing and Analysis

作者： E. Sorantin E. Balogh A. Vilanova i Bartroli K. Palagyi L.G. Nyul Department of Radiology University of Graz Graz Austria Department of Informatics University of Szeged Szeged Hungary Institute of Computer Graphics and Algorithms University of Technology Vienna Vienna Austria

ISBN: (纸本)9539676940

Colorectal cancer is the third most commonly diagnosed cancer; and colonic polyps are known precursors of that particular cancer. Virtual dissection refers to a display technique for polyp detection based on helical CT data, where the colon is dissected and flattened as on the pathologist's table. The approach and image processing as well as the early experience are described in this paper.

关键词： Colonography Colon Computed tomography Cancer Colonic polyps Informatics Image reconstruction Humans Hospitals Image processing

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FiberScout: An Interactive Tool for Exploring and Analyzing Fiber Reinforced Polymers

FiberScout: An Interactive Tool for Exploring and Analyzing ...

引用

Pacific (formerly Asia-Pacific APVIS) Visualization Symposium

作者： Johannes Weissenböck Artem Amirkhanov Weimin Li Andreas Reh Alexander Amirkhanov Eduard Gröller Johann Kastner Christoph Heinzl University of Applied Sciences Upper Austria Ufa State Aviation Technical University Ufa Russia Vienna University of Technology Institute of Computer Graphics and Algorithms Vienna Austria

Advanced composites such as fiber reinforced polymers are promising candidate materials for future components as they allow integrating the continuously rising demands of industry regarding cost-effectiveness, function-orientation, integration and weight. The most important structures of fiber reinforced polymers are the individual fibers, as their characteristics (stiffness, strength, ductility, durability, etc.) to a large extent determine the properties of the final component. The main contribution of this paper is the introduction of a new system for interactive exploration and visual analysis of fiber properties in X-ray computed tomography data of fiber reinforced polymers. The presented tool uses parallel coordinates to define and configure initial fiber classes. Using a scatter plot matrix linked to the parallel coordinates the initial classification may be refined. This allows to analyze hidden relationships between individual fiber properties. 2D and 3D views depict the resulting fiber classifications. By using polar plots an intuitive rendering of the fiber orientation distribution is provided. In addition, two modules of higher abstraction are proposed: The Blob visualization creates a hull around fibers with similar characteristics. The fiber metadata visualization allows to calculate overlays for 2D and 3D views containing regional information of particular material characteristics. The proposed system has been evaluated by two groups of domain experts. Applying the presented concepts the user feedback shows that the domain experts are now able to efficiently perform tasks as classification of fibers, visualization of fiber lengths and orientations, and visualization of fiber regions. The insights gained can be forwarded to the design office as well as to material development and simulation, in order to speed up the development of novel composite components.

关键词： Data visualization Three-dimensional displays Visualization Image color analysis Plastics Pipelines

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