Region-of-Interest CT Reconstruction using One-Endpoint Hilbert Inversion in Optimized Directions - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2021

Region-of-Interest CT Reconstruction using One-Endpoint Hilbert Inversion in Optimized Directions

Résumé

In computed tomography, scanning the entire object is some- times impossible, causing truncated projection data. Reconstruction is however still possible: using differentiated backprojection, the Hilbert transform of the object can be calculated and inverted along line segments in the field-of-view. When two endpoints of the line segment are outside the object extent, a stable analytic reconstruction formula exists. When only one endpoint is outside the object extent, every pixel can be reconstructed, but no inversion formula is known yet. Uniqueness of the inverse Hilbert transform is nevertheless guaranteed along such segments, and a numerical inverse can be used. Most pixels of the field-of-view accept more than one “one-endpoint line segment” and one can choose the direction; we propose here to select the optimal direction based on an empirical criterion. Image quality improvement is assessed against a reconstruction that uses a single direction for every pixel.
Fichier non déposé

Dates et versions

hal-03706300 , version 1 (27-06-2022)

Identifiants

  • HAL Id : hal-03706300 , version 1

Citer

Aurélien Coussat, Simon Rit, Michel Defrise, Jean Michel Létang. Region-of-Interest CT Reconstruction using One-Endpoint Hilbert Inversion in Optimized Directions. 16th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Jul 2021, Leuven, Belgium. , pp.427-430, Proceedings of the 16th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D). ⟨hal-03706300⟩
11 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More