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FIGURE 1. PET/CT protocols for single-phase (A) and multiphase (B) examinations. For protocol A, purple spiral represents whole body in portal-venous contrast enhancement. Scan range included base of skull to proximal thigh, as in PET (blue cylinder). For protocol B, 2 examination protocols had to be implemented because of technical standards of scanner. After injection and bolus tracking of contrast medium, first CT scan covered base of skull to lower borders of kidneys (red spiral). At 90 s after injection, CT ranging from base of lungs to proximal thighs was performed in portal-venous contrast enhancement phase (purple spiral). After short reconstruction interval, attenuation LD-CT (gray spiral) and PET were performed. Thickness of spiral lines indicates dose (thick line: 160 mAs; thin line: 30 mAs); width of spirals indicates collimation (narrow: 0.75; wide: 1.5).
