Fig. 4From: Reliability of dopamine transporter PET measurements with [18F]FE-PE2I in patients with Parkinson’s diseaseRelationship between sample size and effect size for caudate, putamen, ventral striatum, and substantia nigra. The arrow indicates the sample size needed to detect a statistically significant difference with 0.8 power, based on the effect size corresponding to a 10% changeBack to article page