Bone-seeking properties of Tc-99m carbonyl diphosphonic acid, dihydroxy-methylene diphosphonic acid and monohydroxy-methylene phosphoinic acid: concise communication

Carbonyl diphosphonic acid, dihydroxy-methylene diphosphonic acid and monohydroxy-methylene diphosphonic acid were synthesized and labeled with Tc-99m. Their chemical structures were confirmed and their bone-seeking relationships were compared with those of Tc-99m MDP in experimental animals. MKonohydroxy-methylene diphosphonic acid was found to have higher bone affinity and faster blood clearance than MDP, whereas carabonyl diphosphonic acid and dihydroxy-methylene diphosphonic acid demonstrated lower bone affinity and slower blood clearance than MDP.