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![[Figure 4]](vl5049fig4mag.jpg)
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Figure 4
Retrieved dark-field images of the four-rod sample using the different retrieval approaches, with a two-pixel standard deviation Gaussian filter applied post-retrieval: (a) dual-energy propagation-based, (b) single-grid, (c) single-speckle and (d) multi-speckle. Dashed orange arrows in panels (a) and (d) highlight edges in the sample that are only resolved by the corresponding approaches. Solid green arrows in panel (b) indicate Moiré-like artefacts arising from the toothpick fibres, generating phase-contrast fringes comparable in size to the period of the imaging grid. Red arrows in panels (b) and (d) span the tree twig's central pith region, a feature visible only with these two approaches. The black rectangle in panel (a) denotes the 1 mm scale bar for all images. The grayscale ranges for the images are [min (black), max (white)]: (a) = [0.0, 1.2] × 10−10, (b) = [0.0, 8.9] × 10−11, (c) = [0.0, 4.1] × 10−11 and (d) = [0.0, 3.9] × 10−11. |
![[Figure 4]](vl5049fig4.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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