Walter et al. combined [11C]-R-PK11195 PET with USPIO MR imaging to differentiate nonphagocytic (TSPO+ only) vs phagocytic (TSPO+ & USPIO+) neuroinflammatory cells in a permanent microsphere-induced model of MCAO in rats 6–7, 26–27 and 55–56 days post-stroke [85]. Here, TSPO is linked to stroke disorder.