Which among the following has least HU units?: (A) Acute Bleed, (B) Contrast agents, (C) Fat, (D) Air
Answer is D. Air has the least HU Coical Bone +400 to +1000 Calcifications +200 to +250 Contrast agents +130 Hu Acute Bleed +60 to +70 Hu CSF/Water 0 Fat - 50 to -100 Hu AIR -1000 Hu