Fig. 1

The DataSpectrum anthropomorphic phantom (lamb shanks not shown and the lung “tumour” is obscured by the polystyrene in the lung cavities) (a). Axial CT slices of the DataSpectrum anthropomorphic phantom, with adjacent lamb shanks and custom lung “tumour” insert (b, d) and corresponding axial slices of the reconstructed PET (c, e) with ROIs for the liver (green), soft tissue (orange), soft tissue in an area of CT beam hardening (blue) and the lung “tumour” (yellow). ROIs were copied to ensure consistent placement and no overlap into adjoining regions