Figure 2. ¹⁸F‐FDG and ¹³N‐ammonia PET/CT infused images of each group and parameters of PET/CT.

A, Focal increased ¹⁸F‐FDG uptake occurred in the irradiated field (upper panel), ¹³N‐ammonia uptake in the irradiated field decreased at month 6 after radiation and disappeared at month 12 after radiation (bottom panel). B, Area of increased ¹⁸F‐FDG uptake. C. Standardized uptake value ratios of irradiation to nonirradiation of ¹⁸F‐FDG PET/CT. D, Irradiation:nonirradiation activity ratio of ¹³N‐ammonia PET/CT. Data are mean with 95% confidence, *P<0.05, **P<0.01. Con indicates control; ¹⁸F‐FDG, ¹⁸F‐fludeoxyglucose; PET/CT indicates positron emission tomography/computed tomography; and SUV, standardized uptake value.