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Dive into the research topics where Christoph Poliwoda is active.

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Featured researches published by Christoph Poliwoda.


eurographics conference on graphics hardware | 1994

VIRIM: a massively parallel processor for real-time volume visualization in medicine

Thomas Günther; Christoph Poliwoda; Christof Reinhart; Jürgen Hesser; Reinhard Männer; Hans-Peter Meinzer; Hans Jürgen Baur

Architecture and applications of a massively parallel processor are described. Volumes of 256×256×128 voxels can be visualized at a frame rate of 10 Hz using volume oriented visualization algorithms. A prototype of the scalable and modular system is currently set up. 3D rotation around an arbilrary rotation axis, perspective, zooming, and arbilrary gray value mapping are provided in real-time. Multiuser access over high-speed networks is possible. A volume oriented visualization algorithm is used that is tailored to the requirements in medicine [5]. With this algorithm, small structures of a size down to the pixel resolution, and structures without defined surfaces can be visualized as well as semitransparent objects. One application of the system is therapy planning in heart surgery.


medical image computing and computer assisted intervention | 1999

Reconstruction of 3D Catheter Paths from 2D X-Ray Projections

Hans-Joachim Bender; Reinhard Männer; Christoph Poliwoda; Stefan Roth; M. Walz

The diagnosis and therapy of intensive care patients requires the usage of several catheters inside the patients chest. The information about the position and path of the catheters inside the patients body is important for the doctor, but is nowadays not part of the clinical routine. One possible source of this information are CT or NMR scans, which lead to an organizational overhead and additional stress for the intensive care patient. To minimize the overhead we implemented an algorithm to extract the 3D path of catheters in the body of the patient from two or more standard X-ray images. The approach is based on only few assumptions, runs completely in three dimensions, and uses the X- ray images only as a guideline for the path reconstruction process. It shows an inherently robust behaviour against misleading structures in the X-ray images, like loops and intersections. The algorithm has been tested with a selection of test images, including images from the clinical routine.


eurographics | 1995

Virim: A massively parallel processor for real-time volume visualization in medicine

Thomas Günther; Christoph Poliwoda; Christof Reinhart; Jürgen Hesser; Reinhard Männer; Hans-Peter Meinzer; Hans Jürgen Baur

Abstract Architecture and applications of a massively parallel system currently developed are described, which allows real-time visualization using volume oriented visualization algorithms. Volumes of 256 × 256 × 128 voxels can be visualized with a frame rate of 10 Hz. The system is scalable and modular, and will allow a multi-user access over high-speed networks. 3D-rotation around arbitrary rotation axis, perspective, zooming and arbitrary grey value mapping are provided in real-time. A volume oriented algorithm is used that is tailored to the requirements in medicine [H.-P. Meinzer et al., IEEE Comp. Graph. Appl. , 34 (Nov. 1991)]. With this algorithm, small structures without defined surfaces, e.g. , tumours, can be visualized as well as semi-transparent objects. One planned application of the system is heart surgery.


eurographics conference on graphics hardware | 1996

Evaluation of a real-time direct volume rendering system

M. De Boer; Jürgen Hesser; Alexander Gröpl; Thomas Günther; Christoph Poliwoda; Christof Reinhart; Reinhard Männer

VIRIM, a real-time direct volume rendering system is evaluated for medical applications. Experiences concerning the hardware architecture are discussed. The issues are the flexibility of VIRIM, the restriction to two gradient components only, the duplication of the volume data sets on different modules, the size of the volume data set, the gray-value segmentation tool, and the support of algorithmic improvements like space-leaping, early ray-termination and others. It turned out that flexibility is the main benefit and absolutely necessary for VIRIM. Given this flexibility the application areas of real-time rendering systems increase dramatically: Most of the user requirements focus now not on visualization but on general volume data processing. The most serious bottleneck of VIRIM is the limited volume memory that is integrated on the first prototype. The most frequently used tool of VIRIM is gray-value segmentation. It is highly useful if original, i.e. unsegmented data have to be dealt with, and if pre-segmented data have to be investigated. All other benefits and architectural shortcomings are not critical for the application areas of VIRIM, i.e. operation simulation and control in head surgery.


Bildverarbeitung für die Medizin | 2003

Multiresolution Data Handling for Visualization of Very Large Data Sets

Norbert Strobel; Christian Gosch; Jürgen Hesser; Christoph Poliwoda

We discuss some features of an experimental system for visualization of large (medical) volume data sets. Input voxel data sets are subdivided into blocks first. Then each block is decomposed into a multiresolution data representation by applying a reversible 3D integer Haar wavelet transform (S-transform). The resulting transform coefficients are encoded using a Golomb-Rice algorithm. For volume visualization, we selectively load and decompress blocks to a proper resolution. Then they are rendered into a common view. From our experiments, we learned that large volume data sets should preferably be stored using a multiresolution data representation. Depending on the size of the volume data set and the rendering mode, we also found that a block-based data representation can provide some advantages, but it may not always be the best choice.


Studies in health technology and informatics | 1996

Interactive operation planning and control with VIRIM.

Gröpl Tg; Jürgen Hesser; Kröll J; Reinhard Männer; Christoph Poliwoda; Christof Reinhart; Hassfeld S; Jäger W; Quien N; Simon J; Wirth J


Archive | 1996

Planning and Controlling Minimal Invasive Operations by Real-Time Direct Volume Rendering

Alexander Gröpl; Thomas Günther; Jürgen Hesser; Reinhard Männer; H. Messer; Christoph Poliwoda; Christof Reinhart; Willi Jäger; Johannes Wirth; Stefan Haßfeld


Archive | 1994

Real-Time Volume Visualization of CT and NMR Images

Jürgen Hesser; Christoph Poliwoda; Thomas Günther; Christof Reinhart; Reinhard Männer; Hans-Peter Meinzer


publisher | None

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Archive | 2016

Apparatus and method for examining components comprising laid fiber composite fabrics or woven fiber composite fabrics

Thomas Günter; Christoph Poliwoda; Christof Reinhart; Tobias Dierig

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Hans-Peter Meinzer

German Cancer Research Center

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Hans Jürgen Baur

German Cancer Research Center

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M. De Boer

University of Mannheim

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