2021 IEEE International Conference on Image Processing

19-22 September 2021 • Anchorage, Alaska, USA

Imaging Without Borders

2021 IEEE International Conference on Image Processing

19-22 September 2021 • Anchorage, Alaska, USA

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Paper Detail

Paper IDSS-CIMM.9
Paper Title REDUCING STAIR ARTIFACTS IN CT RECONSTRUCTION
Authors Markus Wedekind, Technische Universität Braunschweig, Germany; Eric Oertel, GOM GmbH, Germany; Susana Castillo, Marcus Magnor, Technische Universität Braunschweig, Germany
SessionSS-CIMM: Special Session: Computational Imaging for Materials and Microscopy
LocationArea B
Session Time:Monday, 20 September, 13:30 - 15:00
Presentation Time:Monday, 20 September, 13:30 - 15:00
Presentation Poster
Topic Special Sessions: Computational Imaging for Materials and Microscopy
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Abstract Computed Tomography is increasingly employed for nondestructive evaluation, with the aim of reconstructing a surface mesh of a scanned object from radiographic projections. State-of-the-art algorithms first reconstruct a voxel grid and then extracted a surface mesh using existing meshing algorithms, often leading to stair-like aliasing artifacts along the grid axes, due to the grid's orientation-dependent resolution. We circumvent such artifacts in filtered backprojection reconstructions by optimizing the mesh's vertex positions using information taken directly from the projections, rather than from a voxel grid. We show that our approach reduces stair artifacts both visibly and measurably, at relatively little additional computational cost. Our method can be tied into existing mesh extraction algorithms and removes stair artifacts almost entirely.