Tc-99m ethyl cysteinate dimer (ECD) brain perfusion single photon computed tomography fusion with CT imaging (SPECT/CT) showed asymmetry hypoperfusion (white arrow) at right cerebellum. In comparison, homogeneous red colon in the left cerebellum means normal findings of cerebellum perfusion. Brain perfusion SPECT/CT was performed 30 minutes after intravenous injection of 740 MBq Tc-99m ECD in a room with low level of ambient light and minimal background noise. Brain perfusion SPECT detects regional cerebral blood flow and has been widely used to evaluate various neurological disorders (white arrow head).