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首页> 外文期刊>IEEE transactions on visualization and computer graphics >The Sinogram Polygonizer for Reconstructing 3D Shapes
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The Sinogram Polygonizer for Reconstructing 3D Shapes

机译:用于重建3D形状的Sinogram多边形生成器

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摘要

This paper proposes a novel approach, the sinogram polygonizer, for directly reconstructing 3D shapes from sinograms (i.e., the primary output from X-ray computed tomography (CT) scanners consisting of projection image sequences of an object shown from different viewing angles). To obtain a polygon mesh approximating the surface of a scanned object, a grid-based isosurface polygonizer, such as Marching Cubes, has been conventionally applied to the CT volume reconstructed from a sinogram. In contrast, the proposed method treats CT values as a continuous function and directly extracts a triangle mesh based on tetrahedral mesh deformation. This deformation involves quadratic error metric minimization and optimal Delaunay triangulation for the generation of accurate, high-quality meshes. Thanks to the analytical gradient estimation of CT values, sharp features are well approximated, even though the generated mesh is very coarse. Moreover, this approach eliminates aliasing artifacts on triangle meshes.
机译:本文提出了一种新颖的方法,即正弦图多边形化器,用于直接从正弦图(即X射线计算机断层扫描(CT)扫描仪的主要输出,该图像由从不同视角显示的物体的投影图像序列组成)重建3D形状。为了获得近似于扫描对象表面的多边形网格,通常将基于网格的等值面多边形化器(例如Marching Cubes)应用于从正弦图重建的CT体积。相反,所提出的方法将CT值视为连续函数,并基于四面体网格变形直接提取三角形网格。这种变形涉及二次误差度量最小化和最佳Delaunay三角剖分,以生成精确的高质量网格。由于对CT值进行了分析性梯度估计,即使生成的网格非常粗糙,也可以很好地逼近清晰的特征。此外,这种方法消除了三角形网格上的混叠伪影。

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