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Figure 4: Top row-Tc-99m TRODAT SPECT images of a (a) normal control, (b) early PD-showing decreased tracer binding in the left putamen, and (c) advanced PD showing decreased binding in both putamina. Bottom row-FDOPA PET images of a (d) normal control, (e) early PD-showing decreased tracer uptake in the left putamen, and (f) advanced PD showing decreased tracer uptake in both putamina

Figure 4: Top row-Tc-99m TRODAT SPECT images of a (a) normal control, (b) early PD-showing decreased tracer binding in the left putamen, and (c) advanced PD showing decreased binding in both putamina. Bottom row-FDOPA PET images of a (d) normal control, (e) early PD-showing decreased tracer uptake in the left putamen, and (f) advanced PD showing decreased tracer uptake in both putamina