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Talbot-Lau X-ray Phase-Contrast Research at Johns Hopkins [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2014.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
23 pages : digital, PDF file
Additional Creators
Johns Hopkins University, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The Talbot-Lau (T-L) grating interferometer enables X-ray differential phase-contrast (DPC) imaging with low coherence conventional X-ray tubes, being thus attractive for medical and other applications. We studied several variations of the conventional T-L interferometer design. First, to extend the T-L method to high X-ray energy we developed a symmetric interferometer having gratings inclined at a glancing angle (GAI). This simple setup enables achieving high fringe contrast up to 80 kVp or more. The high GAI contrast in turn enabled demonstrating for the first time DPC-CT of soft tissues with clinically compatible X-ray dose and energy. Industrial and security applications of the GAI appear also possible. Further on, we studied high magnification T-L interferometry for electron density diagnostic in high energy density plasmas. High magnification refraction radiography with laser driven backlighters can help understand inertial confinement fusion experiments for instance. For plasma diagnostic using a single radiographic image we develop Moiré fringe deflectometry. We also extended the T-L method below 10 keV using membrane and free standing gratings. Lastly, we explored using grazing incidence micro-periodic mirrors instead of gratings in the T-L interferometers. These enable in principle achieving very small interferometer periods over a broad energy range, at the price of a narrow field of view in one dimension. The possibility of using these designs for DPC imaging of materials under extreme conditions will also be examined.
Report Numbers
E 1.99:doe/na--0001835-11
doe/na--0001835-11
Subject(s)
Note
Published through SciTech Connect.
05/12/2014.
"doe/na--0001835-11"
2014 APS/CNM/EMC Users Meeting , Argonne, IL (United States), 12-15 May 2014.
Dan Stutman; Maria Pia Valdivia; Michael Finkenthal.
Funding Information
NA0001835
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