Hi afni Experts,
I always use afni_proc.py to process my fMRI data. I notice that extents masking is applied in the volreg step if I use tlrc_warp on functional dataset.
I read some people's script that do not use the afni_proc.py. Not all of them use extents masking.
So I wonder whether extents masking is a necessary step? What are the benefits of using extents making?
I read the masking note of afni_proc.py many times. But I still can not able to fully comprehend the necessities of this step.
Thanks a lot！
Best,
Lz
