Regensburg 2013 – scientific programme

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MI: Fachverband Mikrosonden

MI 6: X-ray Imaging, Holography and Tomography

MI 6.3: Talk

Wednesday, March 13, 2013, 10:00–10:15, H5

Advanced image processing algorithms for coherent X-ray nanoCT — •Benedikt Daurer, Björn Enders, Andreas Fehringer, Marco Stockmar, Martin Dierolf, Irene Zanette, Franz Pfeiffer, and Pierre Thibault — Departement of Physics (E17), Technische Universität München, Germany

A recently developed coherent diffractive imaging technique named ptychography [1] provides the possibility to reconstruct tomographic volumes of nano-structured samples using hard X-ray beams [2].

Today's algorithms used for ptychography retrieve the accumulated complex-valued index of refraction behind an object for all tomographic angles individually. The total acquisition time for a full tomographic scan using ptychography is typically between 6 and 24 hours and thus the different projections are individually shifted due to limited mechanical accuracy and thermal drifts. This requires the use of advanced alignment procedures without fiducial markers [3], which is particularly challenging in the case of local tomography or limited-angle tomography. We will present a quantitative analysis of the different algorithms available and will describe newly developed strategies.

[1] Rodenburg, J. et al. (2007). Hard-X-Ray Lensless Imaging of Extended Objects. Physical Review Letters, 98(3), 034801.

[2] Dierolf, M. et al. (2010). Ptychographic X-ray computed tomography at the nanoscale. Nature, 467(7314), 436-439.

[3] Guizar-Sicairos, M. et al. (2011). Phase tomography from x-ray coherent diffractive imaging projections. Optics Express, 19(22), 21345.