[Freesurfer] Converting a volume from MNI152 to subject space

Hi Freesurfers,

I am trying to convert a volume from MNI152 to subject space. I tried to do what this previous question suggested:

https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2013-December/034722....

I tried to create a registration matrix from subject space to MNI152:

mni152reg --s AL15

However, this error appeared:

... mkdir: cannot create directory `/usr/pubsw/packages/fsl/current/data/standard/tmp.fslregister.28345': Permission denied ... writing to /usr/pubsw/packages/fsl/current/data/standard/tmp.fslregister.28345/refvol.fslregister.nii... ERROR: failure writing /usr/pubsw/packages/fsl/current/data/standard/tmp.fslregister.28345/refvol.fslregister.nii

I would then have used this command:

mri_label2vol --seg lh.AItou.nii.gz --reg AL15/mri/transforms/reg.mni152.2mm.dat --invertmtx --o lh.aitou.AL15.nii.gz --temp AL15/mri/orig.mgz

How can I make the mni152reg command work? Is this the correct way to do this?

Thanks!

Best, Omar