Dresden 2017 – wissenschaftliches Programm

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KR: Fachgruppe Kristallographie

KR 2: X-Ray Imaging, Holography, Ptychography and Tomography (with MI)

KR 2.5: Vortrag

Mittwoch, 22. März 2017, 11:00–11:15, MER 02

X-Ray Phase-Contrast Tomography with Anisotropic Source Conditions — •Malte Vassholz, Leon Merten Lohse, and Tim Salditt — Institute for X-Ray Physics, University of Göttingen, Germany

Hard x-ray tomography offers a unique capability to nondestructively map out the three-dimensional structure of a body or material. A major challenge for high-resolution and/or phase-contrast tomography in the laboratory, is the lack of high-brilliance table-top x-ray sources. By suitable generalization of the tomographic measurement geometry and the reconstruction framework, one can significantly relax the brilliance/coherence condition in one of the two lateral source dimensions [1], opening up new opportunities towards nanoscale resolution with low-brilliance table-top x-ray sources. To this end, the framework of the two-dimensional Radon transform, which is the common basis for most analytical x-ray tomography applications, is replaced by the three-dimensional Radon transform. We show applications for absorption tomography as well as phase-contrast tomography for anisotropic source conditions with aspect ratios larger than two orders of magnitude in the lateral source dimensions.

[1] M. Vassholz, B. Koberstein-Schwarz, A. Ruhlandt, M. Krenkel, and T. Salditt, Phys. Rev. Lett. 116, 088101 (2016).