Information
- Replaced by: RAUTEK06
- Publication Type: Technical Report
- Workgroup(s)/Project(s):
- Date: April 2005
- Number: TR-186-2-05-03
- Keywords: Volume Rendering, Filtered Back-Projection, Reconstruction
Abstract
Volume-rendering techniques are conventionally classified into two categories represented by direct and indirect methods. Indirect methods require to transform the initial volumetric model into an intermediate geometrical model in order to efficiently visualize it. In contrast, direct volume-rendering (DVR) methods can directly process the volumetric data. Modern 3D scanning technologies, like CT or MRI, usually provide data as a set of samples on rectilinear grid points, which are computed from the measured projections by discrete tomographic reconstruction. Therefore the set of these reconstructed samples can already be considered as an intermediate volume representation. In this paper we introduce a new paradigm for direct direct volume rendering (D²VR), which does not require a rectilinear grid at all, since it is based on an immediate processing of the measured projections. Arbitrary samples for ray casting are reconstructed from the projections by using the Filtered Back-Projection algorithm. Our method removes an unnecessary and lossy resampling step from the classical volume rendering pipeline. Thus, it provides much higher accuracy than traditional grid-based resampling techniques do. Furthermore we also present a novel high-quality gradient estimation scheme, which is also based on the Filtered Back-Projection algorithm. Finally we introduce a hierarchical space partitioning approach for projection-based volumetric data, which is used to accelerate D²VR.Additional Files and Images
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@techreport{TR-186-2-05-03, title = "D²VR: High Quality Volume Rendering of Projection-based Volumetric Data", author = "Bal\'{a}zs Cs\'{e}bfalvi and Peter Rautek and S\"{o}ren Grimm and Stefan Bruckner and Eduard Gr\"{o}ller", year = "2005", abstract = "Volume-rendering techniques are conventionally classified into two categories represented by direct and indirect methods. Indirect methods require to transform the initial volumetric model into an intermediate geometrical model in order to efficiently visualize it. In contrast, direct volume-rendering (DVR) methods can directly process the volumetric data. Modern 3D scanning technologies, like CT or MRI, usually provide data as a set of samples on rectilinear grid points, which are computed from the measured projections by discrete tomographic reconstruction. Therefore the set of these reconstructed samples can already be considered as an intermediate volume representation. In this paper we introduce a new paradigm for direct direct volume rendering (D²VR), which does not require a rectilinear grid at all, since it is based on an immediate processing of the measured projections. Arbitrary samples for ray casting are reconstructed from the projections by using the Filtered Back-Projection algorithm. Our method removes an unnecessary and lossy resampling step from the classical volume rendering pipeline. Thus, it provides much higher accuracy than traditional grid-based resampling techniques do. Furthermore we also present a novel high-quality gradient estimation scheme, which is also based on the Filtered Back-Projection algorithm. Finally we introduce a hierarchical space partitioning approach for projection-based volumetric data, which is used to accelerate D²VR.", month = apr, number = "TR-186-2-05-03", address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria", institution = "Institute of Computer Graphics and Algorithms, Vienna University of Technology ", note = "human contact: technical-report@cg.tuwien.ac.at", keywords = "Volume Rendering, Filtered Back-Projection, Reconstruction", URL = "https://www.cg.tuwien.ac.at/research/publications/2005/TR-186-2-05-03/", }