problem with skullstrip

Dear all,
I met problems in using 3dSkullStrip to extract brain from some 3D structural images.
the right parietal and occipital lobe was missed after the Skullstrip.
I have tried methods mentioned in the help page of 3dSkullStrip.
It did not work.
You can download the file below for a check.

Thanks very much!


See if this works with what you want to do.

3dUnifize -gm -prefix 3ds_un 3ds.nii
3dSkullStrip -input 3ds_un+orig. -shrink_fac_bot_lim 0.8 -overwrite -prefix anat_un_ns