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Translocator protein (TSPO) is a biomarker for detecting neuroinflammation by PET. 11C-(R)-PK11195 has been used to image TSPO since the 1980s. Here, we compared the utility of four 11C-labeled ligands—(R)-PK11195, PBR28, DPA-713, and ER176—to quantify TSPO in healthy humans. For all of these ligands, BPND (specific-to-non-displaceable ratio of distribution volumes) was measured by partially blocking...
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