Dye used in SPECT-: (A) O-14, (B) Tc-99, (C) Nitrogen-16, (D) Iodine 124
Answer is B. SPECT imaging: It has a 360deg revolving gamma camera giving 3D images Tc99m radioisotope is used (t1/2 = 6 hrs) Tc99m - HMPAO: Lipophilic/Lipid soluble Crosses blood brain barrier Cerebral perfusion is evaluation