I analyzed functional data by spm and made a mask (analyze format). I have also run recon-all of structural data. 

My question is: how to extract mean volume (from structural data) of the mask(from spm)?

I only extracted volume(or thickness) of ROI of a label edited by myself and annotation file. If I can convert analyze format to a label or annotation file, I can use that method. But how to convert analyze format to a label or annotation?

Or is there any easy way?

Thanks in advance!

Mingxia Zhang