In radionuclide imaging, the most useful radiopharmaceutical agent for skeletal imaging is: March 2012, March 2011: (A) Tc-99m linked to methylene diphosphonate (99m Tc-MDP), (B) Tc-99 pyrophosphate, (C) Tc-sulphur colloid (99m Tc-Sc), (D) Gallium 67
Answer is A. Ans: A i.e. Tc-99m linked to methylene diphosphonate (99m Tc-MDP) Radiopharmacological agents and uses Tc-99m linked to methylene diphosphonate (99m Tc-MDP) is used in bone imaging Tc-99 pyrophosphate is used for defining hot spots in myocardial infarction/avid infarct imaging 99m Tc-Sc is used in imaging of reticuloendothelial system (liver/ spleen), gastric emptying, GI bleeds Gallium 67 is used for tumours/abscess