SPECT and MRI of the hypothalamus. (A) Coronal SPECT image of a healthy subject 2 h after injection of approximately 115 MBq [123I]FP-CIT at the level of the hypothalamus. (B) Coronal T1-weighted MRI image of the same subject with ROI drawn on the hypothalamus. (C) Coregistered SPECT and T1-weighted MRI image with ROI drawn on the hypothalamus. The SPECT images are color encoded for low (black) to high activity (yellow).