Single patient investigation. As a supplementary material, we report CT and MRI images for the patients P4 and P6, which were found having LoA >2 mm in maximum one of the three FMs for localisation performed with multiple sequences. Zoom of an axial slice of CT (top left), bSSFP (top centre-left), SPGR (top centre-right) and GRE (top right) images for the patients P4, P6 before image registration as well as schematic representations of the centres of the FMs as localised by all the observers (bottom) are shown in Figs. 1 and 2, respectively. For completeness, we report also the CT ad MRI images along with the schematic representation of the centres of the FM for patient P14 in Fig. 3. Note that this patient was not considered during the analysis since had a hip implant. (PDF 1823 kb