Figure 3: Mean IBZM uptake ratio in PD, MSA, and PSP patients and healthy controls in the striate. Left and right uptake ratios are averaged. Whiskers represent 95% confidence interval of mean. SPECT: single photon emission computed tomography; IBZM: D2/D3 dopamine receptor imaging with  123I-IBZM; MSA: multiple system atrophy, PSP: progressive supranuclear palsy; PD: Parkinson’s disease; Healthy: healthy controls.