Lyncean Technologies (United States)

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Depuis leur invention dans les annees 60, les lasers et leurs applications ont connu de spectaculaires developpements scientifiques et industriels. En effet, grâce aux proprietes spectrales et spatiales uniques des lasers, l’etude de l’interaction matiere-rayonnement a permis de sonder plus precisement et intimement la matiere sous toutes ses formes. De nouvelles applications telles que la granulometrie laser ont ainsi vu le jour des les annees 70 et n’ont cesse de se developper depuis lors.

Abstract X-ray phase and dark-field contrast have recently been the source of much attention in the field of X-ray imaging, as they both contribute new imaging signals based on physical principles that differ from conventional X-ray imaging. With a so-called Talbot grating interferometer, both phase-contrast and dark-field images are obtained simultaneously with the conventional attenuation-based X-ray image, providing three complementary image modalities that are intrinsically registered. Whereas the physical contrast mechanisms behind attenuation and phase contrast are well understood, a formalism to describe the dark-field signal is still in progress. In this article, we report on correlative experimental results obtained with a grating interferometer and with small-angle X-ray scattering. Furthermore, we use a proposed model to quantitatively describe the results, which could be of great importance for future clinical and biomedical applications of grating-based X-ray imaging.