Fig. 6

Examples of cyclic and acyclic bifunctional chelators for gallium-68; some are also useful for other radiometals: ⁶⁸Ga-DOTA, ⁶⁸Ga-HBED-CC (one of several isomeric structures), ⁶⁸Ga-NODAGA, ⁶⁸Ga-THP and ⁶⁸GA-DFO; pep = peptide, protein or other biomolecule