Fig. 4

a MicroPET/CT imaging of PD rats after intravenous injection of approximately 18.5 MBq of [18F]FTPQ for 30 min. The semi-quantitative analysis of (b) ipsilateral hemisphere-to-contralateral hemisphere ratio and (c) ipsilateral hemisphere-to-cerebellum ratio from the images of the 1-, 2-, and 3-week old PD rats and the sham rats. *significant where P < 0.05, **where significant where P < 0.001 (PD diseased rats compared with sham groups)