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March 2019 issue
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Cover illustration: Tensor tomography methods reconstruct the orientation of a sample's local anisotropic micro/nanostructure without the need for sections. The new iterative reconstruction tensor tomography (IRTT) algorithm [Gao et al. (2019). Acta Cryst. A75, 223-238] is a simple, fast and robust algorithm, thanks to its use of a rank-2 tensor (ellipsoid) model, shown at the top, combined with a linearized iterative reconstruction scheme. Here it is showcased based on SAXS data from different samples, such as a carbon fibers tied in a knot (bottom left), collagen fibers in a human bone trabecula and myelinated axons in a mouse brain (bottom right).
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