FIGURE 2. ^99mTc-TRODAT-1 uptake ratios in striatum in age-matched healthy (normal) individuals, VP patients, and Parkinson’s disease (PD) patients. Age-related decline of ^99mTc-TRODAT-1 uptake ratios in striatum was observed in healthy individuals and in VP patients. In comparison with VP and Parkinson’s disease patients, ^99mTc-TRODAT-1 uptake ratio in striatum is asymmetric and significantly decreased bilaterally in Parkinson’s disease patients. S/O ratio = striatum-to-occipital ratio.

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