D²VR: High Quality Volume Rendering of Projection-based Volumetric Data

Peter Rautek, Balázs Csebfalvi, Sören Grimm, Stefan Bruckner, Meister Eduard Gröller
D²VR: High Quality Volume Rendering of Projection-based Volumetric Data
In Proceedings of Eurographics / IEEE VGTC Symposium on Visualization, pages 211-218. May 2006.
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Abstract

Volume rendering techniques are conventionally classified as either direct or 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 CT scanners usually provide data as a set of samples on a rectilinear grid, which is computed from the measured projections by discrete tomographic reconstruction. Therefore the rectilinear grid can already be considered as an intermediate volume representation. In this paper we introduce direct direct volume rendering (D²VR). D²VR does not require a rectilinear grid, 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 a lossy resampling step from the classical volume rendering pipeline. 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.

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@inproceedings{RAUTEK06,
  title =      "D²VR: High Quality Volume Rendering of Projection-based
               Volumetric Data",
  author =     "Peter Rautek and Bal{\'a}zs Csebfalvi and S{\"o}ren
               Grimm and Stefan Bruckner and Meister Eduard Gr{\"o}ller",
  year =       "2006",
  abstract =   "Volume rendering techniques are conventionally classified as
               either direct or 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 CT
               scanners usually provide data as a set of samples on a
               rectilinear grid, which is computed from the measured
               projections by discrete tomographic reconstruction.
               Therefore the rectilinear grid can already be considered as
               an intermediate volume representation. In this paper we
               introduce direct direct volume rendering (D²VR). D²VR
               does not require a rectilinear grid, 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 a lossy resampling step from the
               classical volume rendering pipeline. 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.",
  pages =      "211--218",
  month =      may,
  number =     "In Proceedings of EuroVis",
  booktitle =  "Proceedings of Eurographics / IEEE VGTC Symposium on
               Visualization",
  publisher =  "IEEE CS",
  keywords =   "Volume Rendering, Filtered Back-Projection, Reconstruction",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/2006/RAUTEK06/",
}