I am trying to register a volumetric roi from an average subject that I created to each individual subject's functional space. I have the transformation matrices that I applied to the functional data to bring them into the average space. When I apply the inverse of those transforms to the roi, the results are way off so I think I must be missing something.   

1. I created a volume from a label with mri_label2vol.

2. I map the volume in the average space to the native functional space with mri_vol2vol.

I take it this is not correct and would appreciate any guidance. 

Thank you, 

pb