Wuppertal 2015 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 1: Biomedical Imaging I

ST 1.4: Talk

Monday, March 9, 2015, 14:45–15:00, BZ.08.02 (HS 3)

Correlation of X-Ray Micro-CT with X-Ray Tensor Tomography — •Christoph Jud, Florian Schaff, Friedrich Prade, and Franz Pfeiffer — TU München, München, Deutschland

X-Ray Tensor Tomography (XTT) is a novel tomographic reconstruction technique that yields information about the orientation of subpixel sized structures. It is based on the dark-field signal, a contrast modality measured with a so called Talbot-Lau grating interferometer. Dark-field images are a measure for the small and ultrasmall angle scattering. With XTT, the scattering tensors can be reconstructed fully in three dimensions.

In order to verify XTT measurements, its correlation to state of the art micro-CT was investigated. Several well-known fibrous samples were used for the investigation. Since small-angle scattering mainly occurs orthogonal to fibres, the XTT data could be simplified to a vectorfield which indicates the fibre direction. A framework was implemented, allowing the direct comparison of both the XTT and the micro-CT datasets. Registration of the datasets was done using a commercial visualization software. A key part of the framewok was the extraction of structure directions out of micro-CT data. This was done with different algorithms including a commercial fibre tracking software. The correlation was then quantitatively investigated by measuring the intermediate angle between both vectorfields. A qualitative comparison was done by visualizing both vectorfields simultaneously. A correlation was found for different sample types and different structure orientations.