Mainz 2014 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 2: Biomedical Imaging I

ST 2.1: Talk

Tuesday, March 25, 2014, 14:00–14:15, RW 2

Optimization of x-ray speckle tracking phase contrast imaging — •Marie-Christine Zdora, Irene Zanette, and Franz Pfeiffer — Department of Physics (E17), Technische Universität München, 85748 Garching, Germany

X-ray phase contrast imaging using speckle tracking is an emerging technique, which combines the advantages of high sensitivity, easy setup and relatively low temporal coherence requirements.
In x-ray speckle tracking a random diffuser with micrometer-sized structures, e.g. a piece of sandpaper or a filter membrane, is placed in the beam. The scattering of x-rays off the structures in the diffuser and the following interference of the scattered rays lead to the formation of a so-called "speckle pattern" in the detector plane. When a sample is introduced into the beam, either upstream or downstream the diffuser, the speckle pattern is distorted by the sample and the phase information can be obtained from the displacement vector of the speckles in the observation plane.
So far, most studies on this topic are of experimental character and parameters (e.g. pore size, x-ray energy, propagation distance etc.) are determined empirically. We present numerical simulations and preliminary experimental results for this technique. Variation of different parameters is performed to optimize speckle contrast and image sensitivity.