Can you give us the command you are trying to use? If you haven't yet, you will need to use either @auto_tlrc (linear/affine) to warp your single subject into MNI space so that 3dfractionize can invert the warp and apply that to the ROI you want back in standard space.
Edited 1 time(s). Last edit at 05/03/2015 08:53PM by Peter Molfese.