Two PET tracers, 11C-BU99008, which primarily binds to I2-imidazoline-2 on the outer mitochondrial membrane in astrocytes, and 11C-DED, which primarily targets monoamine oxidase B in astrocytes, are currently in use and could provide further insight into the metabolic changes in astrocytes during episodes of delirium [135]. Here, MAOB is linked to delirium.