Figure 2: Mean DAT uptake ratios in PD, MSA, and PSP patients and healthy controls in (a) caudate, (b) putamen, (c) striate. Left and right uptake ratios are averaged. Whiskers represent 95% confidence interval of mean. SPECT: single photon emission computed tomography; DAT: dopamine transporter imaging with  123I-FP-Cit; MSA: multiple system atrophy, PSP: progressive supranuclear palsy; PD: Parkinson’s disease; Healthy: healthy controls.