Hi Alfonso, 

Thank you so much for the quick reply!

I did exactly what you have said, but I have an error "Error using FieldMap_create (line 139); Funny number of input fieldmap images".

What I found also weird (attached pic) is that when I load the magnitude alone, it appears ok (left side of the pic) and when I load both magnitude and phase, the image changes (right side of the pic). I am not sure what is happening?

One last question, is it possible to load two image for each subject but not manually, for multiple subject? I used the ALT-select option to load functional and structural data for multiple subject, but it doesn't seem to work when there are two file for each subject.

Thanks,
Regards,

Dayana