Fig. 4.

¹⁸F-FBPA, ¹¹C-methionine, and ¹⁸F-FDG PET/CT images of patients with salivary gland duct carcinoma (upper row) and squamous cell carcinoma (lower row). Three PET scans were performed during a 2-week interval in the Southern TOHOKU Research Institute for Neuroscience (unpublished data, approved by the institutional ethics committee #224). The PET/CT scanner used was Discovery PET/CT 610 (GE Healthcare, Milwaukee, WI), and the injected radioactivity doses of ¹⁸F-FBPA, ¹¹C-methionine, and ¹⁸F-FDG (upper low and lower row) were 4.3 and 4.6, 6.7 and 7.4, and 3.6 and 3.6 MBq/kg body weight, respectively. Yellow arrows; carcinomas; white arrows, salivary gland (upper row) and cerebellum (lower row). PET images are shown in the scale of SUV 0–6 except for ¹⁸F-FDG in the lower row (SUV 0–10). SUV_max values of ¹⁸F-FBPA (40–60 min post injection), ¹¹C-methionine (20–30 min post injection), and ¹⁸F-FDG (50–60 min post injection) were 3.6, 9.7, and 7.1, respectively, in the upper row, and 5.9, 7.2, and 18.5, respectively, in the lower row