|Figure 8: The mean reconstructed attenuation coefficient in Al tubes of different diameters,
scanned (a) in water (20 mm) or (b) air, with 1 mm Al filter and 12 um pixel size.
The in-air scans were repeated at a high resolution (4 um pixel) to minimize partial
volume effects (c). With 1mm Al filter, divergent attenuation linked to thickness
is partly correctable with scans in air, but not in water.