Before revision:  This low comparability is unaltered by site correction, and is most severe when using average cortical thickness as a measure of cortical morphology. The low comparability further extends to significant differencesin graph theoretic measures. Similar results of low reliabilitywere found when comparing rescan sessions of the same subjects, and even between different FreeSurfer versions of the same scans.
After revision:  This low comparability is unaltered by site correction, and is most severe when using average cortical thickness as a morphological measure. Down-stream graph theoretic analyses further show statistically significant differences. In terms of reliability, substantial differences were also found when comparing rescan sessions of the same subjects, and even between different FreeSurfer versions of the same scans.