Shape from projections via differentiable forward projector for computed tomography

Jakeoung Koo*, Anders Bjorholm Dahl, J. Andreas Bærentzen, Qiongyang Chen, Sara Bals, Vedrana Andersen Dahl

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In computed tomography, the reconstruction is typically obtained on a voxel grid. In this work, however, we propose a mesh-based reconstruction method. For tomographic problems, 3D meshes have mostly been studied to simulate data acquisition, but not for reconstruction, for which a 3D mesh means the inverse process of estimating shapes from projections. In this paper, we propose a differentiable forward model for 3D meshes that bridge the gap between the forward model for 3D surfaces and optimization. We view the forward projection as a rendering process, and make it differentiable by extending recent work in differentiable rendering. We use the proposed forward model to reconstruct 3D shapes directly from projections. Experimental results for single-object problems show that the proposed method outperforms traditional voxel-based methods on noisy simulated data. We also apply the proposed method on electron tomography images of nanoparticles to demonstrate the applicability of the method on real data.
Original languageEnglish
Article number113239
JournalULTRAMICROSCOPY
Volume224
Number of pages11
ISSN0304-3991
DOIs
Publication statusPublished - 2021

Keywords

  • Computed Tomography
  • Electron Tomography
  • Tomographic Reconstruction
  • Mesh Deformation

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