You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
19 March 2014Optimization of grating-based phase-contrast imaging setup
Phase contrast imaging (PCI) technology has emerged over the last decade as a novel imaging technique capable of
probing phase characteristics of an object as complimentary information to conventional absorption properties. In
this work, we identified and provided a rationale for optimization of key parameters that determine the performance
of a Talbot-Lau PCI system. The study used the Fresnel wave propagation theory and system geometry to predict
optimal grating alignment conditions necessary for producing maximum-phase contrast. The moiré fringe pattern
frequency and angular orientation produced in the X-ray detector plane were studied as functions of the gratings’
axial rotation. The effect of axial displacement between source-to-phase (L) and phase-to-absorption (d) gratings, on
system contrast, was discussed in detail. The L-d regions of highest contrast were identified, and the dependence of
contrast on the energy of the X-ray spectrum was also studied. The predictions made in this study were tested
experimentally and showed excellent agreement. The results indicated that the PCI system performance is highly
sensitive to alignment. The rationale and recommendations made should serve as guidance in design, development,
and optimization of Talbot-Lau PCI systems.
The alert did not successfully save. Please try again later.
Pavlo Baturin, Mark Shafer, "Optimization of grating-based phase-contrast imaging setup," Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 90334X (19 March 2014); https://doi.org/10.1117/12.2043108