Fig. 3

Effects of contrast media on attenuation-correction in PET/MRI. Attenuation correction (AC)-maps derived from Dixon VIBE MR sequences before (upper row, left) and after contrast media application (bottom row, left). Contrast media application may cause erroneous segmentation of the lungs (right lung: air instead of lung tissue indicated by large blue arrow) and in hilar regions (overestimation of soft tissues bihilarly, small blue arrows). This translates into an erroneous tracer uptake increase on attenuation corrected PET images in the anterolateral wall (red arrows). (Reprinted with permission from Rischpler C, Nekolla SG, PET Clin 11 (2016) 465–477 https://doi.org/10.1016/j.cpet.2016.05.006)