I have scanned two postmortem hemispheres next to each other, but not touching, one left one right, at .25mm resolution. My images look like this [ ᗡD ]. I am wondering how to go about registering these hemispheres to MNI space. Should I split the GRE into two images, each with one hemisphere, and make separate masks? Do I need to split the MNI template? What MNI template should I use? I heard there is one at 0.4mm iso. Any information would be appreciated, thank you all.