Simulations of x-ray speckle-based dark-field and phase-contrast imaging with a polychromatic beam

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Abstract
Following the first experimental demonstration of x-ray speckle-based multimodal imaging using a polychromatic beam [I. Zanette et al., Phys. Rev. Lett. 112(25), 253903 (2014)], we present a simulation study on the effects of a polychromatic x-ray spectrum on the performance of this technique. We observe that the contrast of the near-field speckles is only mildly influenced by the bandwidth of the energy spectrum. Moreover, using a homogeneous object with simple geometry, we characterize the beam hardening artifacts in the reconstructed transmission and refraction angle images, and we describe how the beam hardening also affects the dark-field signal provided by speckle tracking. This study is particularly important for further implementations and developments of coherent speckle-based techniques at laboratory x-ray sources.
Funding Information
  • European Research Council (FP7, StG 240142 & 279753)
  • Deutsche Forschungsgemeinschaft (Cluster of Excellence Munich-Centre for Advanced Photonics (MAP), Gottfried Wilhelm Leibniz program)

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