Performance and optimization of X-ray grating interferometry.
The monochromatic and polychromatic performance of a grating interferometer is theoretically analysed. The smallest detectable refraction angle is used as a metric for the efficiency in acquiring a differential phase-contrast image. Analytical formulae for the visibility and the smallest detectable refraction angle are derived for Talbot-type and Talbot-Lau-type interferometers, respectively, providing a framework for the optimization of the geometry. The polychromatic performance of a grating interferometer is investigated analytically by calculating the energy-dependent interference fringe visibility, the spectral acceptance and the polychromatic interference fringe visibility. The optimization of grating interferometry is a crucial step for the design of application-specific systems with maximum performance.
Swiss Light Source, Paul Scherrer Institut, , Villigen PSI, Switzerland.
T
T
Thuering
M
M
Stampanoni
D007368:Interferometry; D008962:Models, Theoretical; D057054:Molecular Imaging / Q000379:methods*; D014961:X-Ray Diffraction; D014965:X-Rays
X-ray grating interferometry; optimization; phase-contrast imaging; polychromatic performance