Hi Freesurfer, I'm currently making a structural analysis on about 60 Parkinson's Disease patients using freesurfer - and i would like to make a ROI analysis. I have two MR pictures of each subject; a picture where the patients are on medication and an off medication picture (the medication is levodopa: Precursor to catecholamines e.g. dopamin). I would like to investigate the morphological differences in specific areas of the brain such as Nucleus Accumbens bilat., Orbitofrontal cortex bilat. and Anterior Cingulate Cortex. How would you consider freesurfer's strength in investigating differences in such specific areas in the brain? I have another question regarding movement artefacts. In a structural analysis would you remove pictures with movement artefacts if the segmentation after manual editing seems alright? Best,Silas