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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 15: Postersession KFM

KFM 15.23: Poster

Thursday, March 19, 2020, 16:00–18:30, P2/1OG

Phase contrast imaging with sealed-tube sources — •Paul Meyer, Jasper Frohn, and Tim Salditt — Georg August Universität, Göttingen, Germany

Phase contrast x-ray tomography enables three-dimensional reconstruction of objects which cannot be probed by conventional tomography since their absorption-contrast is too weak. This is particularly important for soft biological tissues. However, phase contrast by free propagation relies largely on the availability of synchrotron radiation which provides the required degree of coherence. More recently, progress in laboratory sources and instrumentation has resulted in the implementation of phase contrast imaging with laboratory µCT sources, not only concerning Talbot interferometry but also propagation based phase contrast (Bartels et al., Appl. Phys. Lett. 2013). Apart from advanced liquid jet anode sources and sources with sub-micron spot size, phase contrast has also been realized based on a micro rotating anode with source size s=70µm, given a sufficiently small detector point spread function σD and suitable geometry (Reichhard et al., Proc. SPIE 10391, 2017).

In this contribution, we investigate whether phase contrast effects can be exploited for radiography and tomography even with conventional sealed-tube sources, as used in diffraction experiments with typical anisotropic source sizes. As in the work above, small σD detectors are used to achieve small σeff. To this end, we present different combinations of source (anisotropic) sizes, anodes (Cu and Mo), geometry parameters, and detectors.

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