Figure 1: Imaging of 2.75 mm diameter test object.

Distributions of Kapton, basalt, silica glass, polystyrene and PMMA as determined by XRD-CT (a–e, respectively) and the PDF-CT (h–l, respectively); all images are presented with a common linear grey-coloured scale bar. The image (f) is obtained from the very high Q diffraction signal, which is dominated by Compton scattering, and therefore represents the sample electron density image. The image (m) is the colour-coded composite image derived from components (h–l) determined by PDF-CT; it is coloured accordingly: yellow (Kapton), green (basalt), red (glass), pink (polystyrene) and PMMA (cyan). The line graphs in g and n show portions of XRD and PDFs, respectively, for the individual components coloured in accordance with the composite image (m). CT, computed tomography; PDF, pair distribution function; PMMA, (poly(methyl methacrylate)); XRD, X-ray diffraction.