3D-Terahertz Tomography using a more realistic beam propagation model applied to different image reconstruction methods

Jean-Paul Guillet (1) , B. Recur (2) , I. Manek-Honninger (1) , J. C. Delagnes (1) , W. Benharbone (1) , P. Desbarats (2) , J. P. Domenger (2) , L. Canioni (1) , P. Mounaix (1)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 LaBRI - Laboratoire Bordelais de Recherche en Informatique

In this paper, a model of the beam propagation is developed according to the physical properties of THz waves used in THz computed tomography (CT) scan imaging. This model is first included in an acquisition simulator to observe and estimate the impact of the Gaussian beam intensity profile on the projection sets. Second, the model is introduced in several inversion methods as a convolution filter to perform efficient tomographic reconstructions of simulated and real acquired objects. Results obtained with three reconstruction methods (BFP, SART and OSEM) are compared to the techniques proposed in this paper. We will demonstrate an increase of the overall quality and accuracy of the 3D reconstructions.

Mots clés: X-ray imaging; Convolution; Computed tomography; Computational modeling; Image reconstruction

Domaines: Physique [physics]

Jean-Paul Guillet, B. Recur, I. Manek-Honninger, J. C. Delagnes, W. Benharbone, et al.. 3D-Terahertz Tomography using a more realistic beam propagation model applied to different image reconstruction methods. 2012 37th International Conference on Infrared, Millimeter, and Terahertz Waves, Sep 2012, Wollongong, NSW, Australia. pp.1-2, ⟨10.1109/IRMMW-THz.2012.6380206⟩. ⟨hal-01555431⟩