Hi All, I have a set of 3D binary masks of segmented ventricles and I would like to generate an average mask from the set of 4 masks.Basically I want to create parametric mesh surfaces from the segmented ventricle masks and average corresponding points. Is there a way I can do it for such arbitrary labeled volumes and obtain point correspondences using FSL-FIRST or any other tool ? Thanks for your time and thanks for the great tool. We have started using it for almost everything ! Regards, Jayanth. -- Jayanth Kolar Graduate Research Assistant Physiological Imaging and Modeling Lab University of Illinois at Chicago Chicago IL - 60607 1-408-398-0097 http://www.ece.uic.edu/~jkolar <http://www.ece.uic.edu/%7Ejkolar>