The market taxonomy by type separates molecules according to half-life, production model, and clinical utility. 18F-labeled tracers (FDG, NaF, florbetapir, etc.) generate the largest share because cyclotron networks ensure daily availability and 110-min half-life facilitates interstate distribution. 68Ga products (DOTATATE, DOTATOC, PSMA-11) sit at the intersection of theranostics and decentralized pharmacy compounding, posting >10 % volume growth as generator-based production reduces capital needs. 64Cu agents, though costlier, are emerging in neuroendocrine tumors and are forecast to outgrow the category average. The others bucketโ13N-ammonia, 15O-waterโremains confined to academic PET centers with in-house cyclotrons, limiting share to single digits yet providing indispensable flow and perfusion data.