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Article Dans Une Revue Physics in Medicine and Biology Année : 2004

Exact reconstruction in 2D dynamic CT: compensation of time-dependent affine deformations.

Résumé

This work is dedicated to the reduction of reconstruction artefacts due to motion occurring during the acquisition of computerized tomographic projections. This problem has to be solved when imaging moving organs such as the lungs or the heart. The proposed method belongs to the class of motion compensation algorithms, where the model of motion is included in the reconstruction formula. We address two fundamental questions. First what conditions on the deformation are required for the reconstruction of the object from projections acquired sequentially during the deformation, and second how do we reconstruct the object from those projections. Here we answer these questions in the particular case of 2D general time-dependent affine deformations, assuming the motion parameters are known. We treat the problem of admissibility conditions on the deformation in the parallel-beam and fan-beam cases. Then we propose exact reconstruction methods based on rebinning or sequential FBP formulae for each of these geometries and present reconstructed images obtained with the fan-beam algorithm on simulated data.
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Dates et versions

hal-00308419 , version 1 (30-07-2008)

Identifiants

  • HAL Id : hal-00308419 , version 1
  • PUBMED : 15250070

Citer

Sébastien Roux, Laurent Desbat, Anne Koenig, Pierre Grangeat. Exact reconstruction in 2D dynamic CT: compensation of time-dependent affine deformations.. Physics in Medicine and Biology, 2004, 49 (11), pp.2169-82. ⟨hal-00308419⟩
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