Hi Hugh

it depends on the dataset. It's a bit mysterious to me why sometimes the choroid is so bright and other times not. I've definitely seen it in the inf lat ventricles. We included choroid to avoid confusing it with hippocampus so I doubt we labeled any in the 3rd or 4th ventricles.

cheers Bruce

On Wed, 12 Sep 2012, Hugh Wang wrote:

Dear Freesurfer Users, When masking out the ventricles and choroid plexus from aparg+aseg, I found there were choroid plexus volumes in lateral ventricles, but nothing in inferior lateral ventricles or 3rd/4th ventricle. Did I miss those tiny volumes or the Freesurfer didn't segment choroid plexus into that detail? Thanks!

Best, Hugh

P.S. I used Freesurfer 5.1 on a 64bit CentOS platform