Regensburg 2016 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 3: X-ray Imaging, Holography, Ptychography and Tomography

MI 3.7: Vortrag

Mittwoch, 9. März 2016, 12:15–12:30, H5

Phase-Contrast Tomography with Anisotropic X-Ray Sources — •Malte Vassholz and Tim Salditt — Institute for X-Ray Physics, University of Göttingen, Göttingen, Germany

Nanoscale x-ray tomography is an important method for analysing hard and soft matter. However, high-resolution tomography requires high brilliance x-ray probes with small source sizes in both lateral dimensions and is therefore carried out at synchrotrons. The minimum focal spot size at laboratory x-ray sources is highly limited by insufficient photon flux, whereas anisotropic one-dimensional focusing provides significantly more flux. The central challenge is to get isotropic resolution from anisotropic x-ray probes. Towards the goal of nanoscale resolution at laboratory x-ray sources we have designed a new tomographical data-acquisition scheme with two-dimensional angular sampling and advanced reconstruction methods based on the three-dimensional Radon transform, compatible with anisotropic x-ray probes. Furthermore, we have tested the applicability of propagation-based phase contrast with the novel tomography setup.