I am new to Freesurfer, and I am trying to input/process preterm infant brain data (ultimately attempting longitudinal registration). I already have surfaces generated from Caret, as well as the original T1/T2 images.  My question is: Does anything exist to take processed data from Caret into Freesurfer?  If not, is there a good way to process the T1/T2 images in Freesurfer despite the differences in contrast and intensity (and anatomy)? 

Thank you in advance for your advice,
Kara