Investigation of partial volume effect (PVE) in surface mapping of ODI. A) and B) show an individual subject's representative slice of T1-weighted images and cerebrospinal fluid (CSF) compartment of NODDI (Fiso) with surface lines: the red line is the pial surface, the blue line is the white surface, and the green line is the mid-thickness surface. C), D) and E) show the correlation between group-averaged orientation dispersion index (ODI) mapped on the mid-thickness surface (ODI-MT), ODI mapped on the white matter surface (ODI-WM), and CSF compartment (Fiso) mapped on the mid-thickness. Each data point represents the mean value for each of the 331 cortical parcels. The linear approximation indicates that the ODI-WM and CSF do not correlate with cortical thickness, whereas ODI-MT was correlated with thickness.
Surface Mesh:32k fs LR, Registration:MSMAll