Titre

Study of OSEM with different subsets in grating-based X-ray differential phase-contrast imaging.

Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Zhang, K.
Auteure/Auteur
Hong, Y.
Auteure/Auteur
Zhu, P.
Auteure/Auteur
Yuan, Q.
Auteure/Auteur
Huang, W.
Auteure/Auteur
Wang, Z.
Auteure/Auteur
Chu, S.
Auteure/Auteur
McDonald, S.A.
Auteure/Auteur
Marone, F.
Auteure/Auteur
Stampanoni, M.
Auteure/Auteur
Wu, Z.
Auteure/Auteur
Liens vers les unités
ISSN
1618-2650
Statut éditorial
Publié
Date de publication
2011
Volume
401
Numéro
3
Première page
837
Dernière page/numéro d’article
844
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Résumé
Impressive developments in X-ray imaging are associated with X-ray phase contrast computed tomography based on grating interferometry, a technique that provides increased contrast compared with conventional absorption-based imaging. A new "single-step" method capable of separating phase information from other contributions has been recently proposed. This approach not only simplifies data-acquisition procedures, but, compared with the existing phase step approach, significantly reduces the dose delivered to a sample. However, the image reconstruction procedure is more demanding than for traditional methods and new algorithms have to be developed to take advantage of the "single-step" method. In the work discussed in this paper, a fast iterative image reconstruction method named OSEM (ordered subsets expectation maximization) was applied to experimental data to evaluate its performance and range of applicability. The OSEM algorithm with different subsets was also characterized by comparison of reconstruction image quality and convergence speed. Computer simulations and experimental results confirm the reliability of this new algorithm for phase-contrast computed tomography applications. Compared with the traditional filtered back projection algorithm, in particular in the presence of a noisy acquisition, it furnishes better images at a higher spatial resolution and with lower noise. We emphasize that the method is highly compatible with future X-ray phase contrast imaging clinical applications.
PID Serval
serval:BIB_E603423D2682
DOI
PMID
WOS
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Date de création
2011-10-10T07:25:05.691Z
Date de création dans IRIS
2025-05-21T07:01:12Z