Figure 4.

VT of [18F]FMPEP-d2 increased after abstinence in the 14 cannabis smokers who completed two PET scans before and after abstinence. Significant increases were mostly seen in regions with reduced VT at baseline. Error bars are s.d. of percent change. Abbreviations of brain regions are the same as those in Figure 1. *P < 0.05, two-tailed paired samples t-test.