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

Details

Serval ID
serval:BIB_E603423D2682
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Study of OSEM with different subsets in grating-based X-ray differential phase-contrast imaging.
Journal
Analytical and Bioanalytical Chemistry
Author(s)
Zhang K., Hong Y., Zhu P., Yuan Q., Huang W., Wang Z., Chu S., McDonald S.A., Marone F., Stampanoni M., Wu Z.
ISSN
1618-2650 (Electronic)
Publication state
Published
Issued date
2011
Volume
401
Number
3
Pages
837-844
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Abstract
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.
Pubmed
Web of science
Create date
10/10/2011 8:25
Last modification date
20/08/2019 16:09
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