Quantitative grating-based x-ray dark-field computed tomography

Grating-based x-ray dark-field computed tomography is a functional method that utilizes the scattering contrast mechanism to explore the inaccessible spatially resolved internal structure of the sample. In this letter, we show that the second moment of the scattering angle distribution can be expres...

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Bibliographic Details
Published in:Applied physics letters 2009-08, Vol.95 (9), p.094105-094105-3
Main Authors: Wang, Zhen-Tian, Kang, Ke-Jun, Huang, Zhi-Feng, Chen, Zhi-Qiang
Format: Article
Language:English
Subjects:
ALGORITHMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPUTERIZED SIMULATION
COMPUTERIZED TOMOGRAPHY
MICROSCOPY
X-RAY DIFFRACTION
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Summary:Grating-based x-ray dark-field computed tomography is a functional method that utilizes the scattering contrast mechanism to explore the inaccessible spatially resolved internal structure of the sample. In this letter, we show that the second moment of the scattering angle distribution can be expressed as the minus logarithm of the visibility degradation of the oscillation curve in grating-based imaging. According to the conclusion of Khelashvili [ Phys. Med. Biol. 51 , 221 ( 2006 ) ], the minus logarithm of the visibility ratio fulfills the line integral condition; consequently the scattering information can be reconstructed quantitatively by conventional computed tomography algorithms. Results from a computer simulation and from an actual experiment both validate our deduction.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3213557