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

DOI: 10.1063/1.4931145

Authors: Marie-Christine Zdora (Diamond Light Source) , Pierre Thibault (University College London) , Franz Pfeiffer (Technische Universität München) , Irene Zanette (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Applied Physics , VOL 118 (11)

State: Published (Approved)
Published: September 2015

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.

Journal Keywords: Speckle; Visibility; Speckle Patterns

Subject Areas: Physics, Technique Development


Technical Areas:

Added On: 24/11/2015 11:35

Documents:
1.4931145.pdf

Discipline Tags:

Physics Technique Development - Physics

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