I ran recon -all on my structural image and created ROI masks (using mri_label2vol) based on FreeSurfer's cortical parcellation. I'd like to use these masks for further analysis with FSL. However, it seems that the ROI masks generated with mri_label2vol have different header information than that of the original structural image. As a result, I was unable to carry out further analysis with FSL (e.g., converting these ROI masks into functional space with hires2example_func.mat). I was wondering if there is a way to solve this issue. 

Many thanks in advance.

Frank