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Directional X-Ray Scattering and Microtomography for Laboratory-Based Imaging of Fibrous Materials and Biological Tissues
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DOI：10.1002/smsc.70360.png)
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Abstract
En 中文
X-ray microtomography enables nondestructive three-dimensional imaging, yet conventional attenuation contrast provides limited sensitivity to microstructural organization below the system's spatial resolution. Dark-field imaging addresses this limitation by detecting scattering from unresolved structures, enabling indirect access to sub-resolution features across large fields of view. Here we present a compact laboratory-based X-ray microtomography approach capable of resolving attenuation, phase, and anisotropic scattering signals with micrometre-scale resolution across centimeter-scale samples. The method employs a single intensity modulator and is compatible with conventional X-ray sources and detectors. A key element of our system is its sensitivity to scattering along two orthogonal directions in the image plane, enabling the measurement of scattering anisotropy with a single exposure. As well as simple and robust, the approach provides sensitive and precise measurements of directional scattering signals. We demonstrate its capabilities across engineering and biological systems, including fiber-reinforced composites, wood, bovine intervertebral discs, rat hearts, and porcine meniscus. In these samples, dark-field tomography reveals microstructural heterogeneity and fiber-related organization well below the voxel size that are not accessible with attenuation or phase contrast alone. These findings demonstrate the potential of the approach for nondestructive three-dimensional characterization of complex materials and biological tissues across engineering and biomedical research.
Keywords:
anisotropy
attenuation
image plane
image resolution
intensity modulation
materials science
optics
scattering
tomography
voxel
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