Fig. 1

Classification of artefacts (red boxes) on sCT (above) and the relative source MR mDIXON in-phase sequence (below). Type 1, known as SFD artefacts, are sub-classified based on their position relative to bones (type 1a-b-c). Type 2a-b artefacts are associated with dental implants. Type 3 artefacts are characterised by a bone gap