Figure 8a.

¹²³I-Ioflupane SPECT images with normal and abnormal findings. (a) Axial SPECT images of the brain in a patient without Parkinson disease show bilateral uptake throughout the corpus striatum, with radiotracer uptake in the caudate heads and putamina. This has a comma appearance (arrows) at the appropriate levels. (b) Axial SPECT images in a patient with Parkinson disease show overall significantly decreased radiotracer uptake (note the increased image noise), with the most significant loss in the bilateral putamina. Preserved uptake in this case is depicted in the caudate heads, with a period appearance (arrows).