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. 2013 May;86(1025):20120570. doi: 10.1259/bjr.20120570

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Figure 1. — Transverse CT image (a) showing a typical artefact caused by a dental implant. The corresponding CT-based attenuation-corrected positron emission tomography (PET) (b) and PET/CT (c) images show an (artificially) increased ¹⁸F-fludeoxyglucose (¹⁸F-FDG) uptake (arrow in Figure 1b) of the adjacent soft tissue. The MRI-based attenuation correction (MRAC) map of the same patient (d) shows a large region of missing data and tissue misclassification as air around the dental implants, resulting in an artificially decreased ¹⁸F-FDG uptake (arrow in Figure 1e) in the corresponding MRAC PET (e). The PET/MRI image (f) shows a severe artefact in the transverse T₁ weighted sequence used for anatomical correlation.