Quantitative phase imaging with polychromatic sources

X-ray phase contrast imaging with polychromatic sources and the concept of effective energy

Grating based quantitative polychromatic x-ray phase imaging is currently a very active area of research. It has already been shown that, in such systems, the retrieved differential phase depends upon the spectral properties of the source, gratings, detector and sample. In this paper, we show that the retrieved sample absorption also depends upon the spectral properties of the gratings. Further...

Grating pseudo-imaging with polychromatic and finite extension sources.

The pseudo-imaging process in a system consisting of two periodic gratings and illuminated by an incoherent polychromatic and finite extension source placed at a finite distance from the gratings is studied. An analytical expression of the irradiance distribution on a plane, also located at a finite distance from the gratings, has been obtained from previous results on monochromatic illuminatio...

Phase imaging using a polychromatic x-ray laboratory source.

We describe a quantitative phase imaging process using an x-ray laboratory-based source with an extremely broad bandwidth spectrum. The thickness of a homogeneous object can be retrieved by using separately spectrally weighted values for the attenuation coefficient and the decrement of the real part of the refractive index. This method is valid for a wide range of object types, including object...

Quantitative Phase Imaging

Quantitative phase imaging with partially coherent illumination.

In this Letter, we formulate a mathematical model for predicting experimental outcomes in quantitative phase imaging (QPI) when the illumination field is partially spatially coherent. We derive formulae that apply to QPI and discuss expected results for two classes of QPI experiments: common path and traditional interferometry, under varying degrees of spatial coherence. In particular, our resu...