animal studies show that tc-99m hmdp has a higher uptake on bone and a more rapid clearance from the blood than any of the three technetium-labeled bone imaging agents in current use : tc-99m methylene diphosphonate ( dmp ) , tc-99 ( 1-hydroxyethylidene ) diphosphonate ( hedp ) , and tc-99m pyrophosphate ( ppi ) .
C0012544
diphosphonate
C0086268
hedp