Application of a real-space three-dimensional image reconstruction method in the structural analysis of noncrystalline biological macromolecules enveloped by water in coherent x-ray diffraction microscopy

A maximum a posteriori approach is proposed for X-ray diffraction tomography for reconstructing three-dimensional spatial distribution of crystallographic phases and orientations of polycrystalline materials. The approach maximizes the a posteriori density which includes a Poisson log-likelihood and an a priori term that reinforces expected solution properties such as smoothness or local continuity. The reconstruction method is validated with experimental data acquired from a section of the spinous process of a porcine vertebra collected at the 1-ID-C beamline of the Advanced Photon Source, at Argonne National Laboratory. The reconstruction results show significant improvement in the reduction of aliasing and streaking artefacts, and improved robustness to noise and undersampling compared to conventional analytical inversion approaches. The approach has the potential to reduce data acquisition times, and significantly improve beamtime efficiency.

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High-resolution ab initio three-dimensional x-ray diffraction microscopy

Journal of the Optical Society of America A ◽

10.1364/josaa.23.001179 ◽

2006 ◽

Vol 23 (5) ◽

pp. 1179 ◽

Cited By ~ 405

Author(s):

Henry N. Chapman ◽

Anton Barty ◽

Stefano Marchesini ◽

Aleksandr Noy ◽

Stefan P. Hau-Riege ◽

...

Keyword(s):

High Resolution ◽

Ab Initio ◽

Three Dimensional ◽

X Ray Diffraction ◽

X Ray ◽

Diffraction Microscopy

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Three-dimensional α colony characterization and prior-β grain reconstruction of a lamellar Ti–6Al–4V specimen using near-field high-energy X-ray diffraction microscopy

Journal of Applied Crystallography ◽

10.1107/s1600576715011139 ◽

2015 ◽

Vol 48 (4) ◽

pp. 1165-1171 ◽

Cited By ~ 9

Author(s):

E. Wielewski ◽

D. B. Menasche ◽

P. G. Callahan ◽

R. M. Suter

Keyword(s):

Near Field ◽

Three Dimensional ◽

High Energy ◽

Grain Structure ◽

X Ray Diffraction ◽

Orientation Field ◽

X Ray ◽

Hexagonal Close Packed ◽

Flood Fill ◽

Diffraction Microscopy

Near-field high-energy X-ray diffraction microscopy has been used to characterize the three-dimensional (3-D) crystallographic orientation field of the hexagonal close-packed α phase in a bulk Ti–6Al–4V specimen with a lamellar (β-annealed) microstructure. These data have been segmented using a 3-D misorientation-based grain finding algorithm, providing unprecedented information about the complex 3-D morphologies and spatial misorientation distributions of the transformed α lamella colonies. A 3-D Burgers orientation relationship-based flood-fill algorithm has been implemented to reconstruct the morphologies and crystallographic orientations of the high-temperature body-centered cubic prior-β grains. The combination of these data has been used to gain an understanding of the role of the prior-β grain structure in the formation of specific morphologies and spatial misorientation distributions observed in the transformed α colony structures. It is hoped that this understanding can be used to develop transformation structures optimized for specific applications and to produce more physically realistic synthetic microstructures for use in simulations.

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