Analysis of Cone-Beam Artifacts in off-Centered Circular CT for Four Reconstruction Methods

Cone-beam (CB) acquisition is increasingly used for truly three-dimensional X-ray computerized tomography (CT). However, tomographic reconstruction from data collected along a circular trajectory with the popular Feldkamp algorithm is known to produce the so-called CB artifacts. These artifacts resu...

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Main Authors: S. Valton, F. Peyrin, D. Sappey-Marinier
Format: Article
Language:English
Published: Wiley 2006-01-01
Series:International Journal of Biomedical Imaging
Online Access:http://dx.doi.org/10.1155/IJBI/2006/80421
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author S. Valton
F. Peyrin
D. Sappey-Marinier
author_facet S. Valton
F. Peyrin
D. Sappey-Marinier
author_sort S. Valton
collection DOAJ
description Cone-beam (CB) acquisition is increasingly used for truly three-dimensional X-ray computerized tomography (CT). However, tomographic reconstruction from data collected along a circular trajectory with the popular Feldkamp algorithm is known to produce the so-called CB artifacts. These artifacts result from the incompleteness of the source trajectory and the resulting missing data in the Radon space increasing with the distance to the plane containing the source orbit. In the context of the development of integrated PET/CT microscanners, we introduced a novel off-centered circular CT cone-beam geometry. We proposed a generalized Feldkamp formula (α-FDK) adapted to this geometry, but reconstructions suffer from increased CB artifacts. In this paper, we evaluate and compare four different reconstruction methods for correcting CB artifacts in off-centered geometry. We consider the α-FDK algorithm, the shift-variant FBP method derived from the T-FDK, an FBP method based on the Grangeat formula, and an iterative algebraic method (SART). The results show that the low contrast artifacts can be efficiently corrected by the shift-variant method and the SART method to achieve good quality images at the expense of increased computation time, but the geometrical deformations are still not compensated for by these techniques.
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institution Kabale University
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spelling doaj-art-c6ce427fac544731b565151d5d3a16bb2025-02-03T01:12:28ZengWileyInternational Journal of Biomedical Imaging1687-41881687-41962006-01-01200610.1155/IJBI/2006/8042180421Analysis of Cone-Beam Artifacts in off-Centered Circular CT for Four Reconstruction MethodsS. Valton0F. Peyrin1D. Sappey-Marinier2CREATIS, UMR CNRS 5515, Villeurbanne 69621, FranceCREATIS, UMR CNRS 5515, Villeurbanne 69621, FranceCREATIS, UMR CNRS 5515, Villeurbanne 69621, FranceCone-beam (CB) acquisition is increasingly used for truly three-dimensional X-ray computerized tomography (CT). However, tomographic reconstruction from data collected along a circular trajectory with the popular Feldkamp algorithm is known to produce the so-called CB artifacts. These artifacts result from the incompleteness of the source trajectory and the resulting missing data in the Radon space increasing with the distance to the plane containing the source orbit. In the context of the development of integrated PET/CT microscanners, we introduced a novel off-centered circular CT cone-beam geometry. We proposed a generalized Feldkamp formula (α-FDK) adapted to this geometry, but reconstructions suffer from increased CB artifacts. In this paper, we evaluate and compare four different reconstruction methods for correcting CB artifacts in off-centered geometry. We consider the α-FDK algorithm, the shift-variant FBP method derived from the T-FDK, an FBP method based on the Grangeat formula, and an iterative algebraic method (SART). The results show that the low contrast artifacts can be efficiently corrected by the shift-variant method and the SART method to achieve good quality images at the expense of increased computation time, but the geometrical deformations are still not compensated for by these techniques.http://dx.doi.org/10.1155/IJBI/2006/80421
spellingShingle S. Valton
F. Peyrin
D. Sappey-Marinier
Analysis of Cone-Beam Artifacts in off-Centered Circular CT for Four Reconstruction Methods
International Journal of Biomedical Imaging
title Analysis of Cone-Beam Artifacts in off-Centered Circular CT for Four Reconstruction Methods
title_full Analysis of Cone-Beam Artifacts in off-Centered Circular CT for Four Reconstruction Methods
title_fullStr Analysis of Cone-Beam Artifacts in off-Centered Circular CT for Four Reconstruction Methods
title_full_unstemmed Analysis of Cone-Beam Artifacts in off-Centered Circular CT for Four Reconstruction Methods
title_short Analysis of Cone-Beam Artifacts in off-Centered Circular CT for Four Reconstruction Methods
title_sort analysis of cone beam artifacts in off centered circular ct for four reconstruction methods
url http://dx.doi.org/10.1155/IJBI/2006/80421
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AT fpeyrin analysisofconebeamartifactsinoffcenteredcircularctforfourreconstructionmethods
AT dsappeymarinier analysisofconebeamartifactsinoffcenteredcircularctforfourreconstructionmethods