A key observation is that the parallax artefact significantly affects the crystallite sizes obtained by conventional approaches. Specifically, on both 180 and 360 °XRD-CT scans, it leads to broadened diffraction peaks and reduced crystallite values when using the FBP reconstruction algorithm. The maps suggest that ParallaxNet has, to a certain extent, solved the peak broadening artefact instigated by parallax. This correction is particularly pronounced for the two MgO components, where their crystallite sizes offer mutual validation. Based on these observations, we can deduce that ParallaxNet can correctly solve the parallax artefact on the real phantom experimental dataset. The R wp map, for all Rietveld analyses, can be further observed in Supplementary Figure . In Supplementary Figures and Supplementary Table we provide comparisons between the lattice parameters and crystallite sizes for all three phases obtained using region-of-interest parallax-free diffraction patterns from the sinogram data and ParallaxNet reconstructed diffraction patterns.