Hello Lilla,

Thank you very much for the suggestion. Here then are my attempts at putting what you said into two sequential commands:

mri_vol2vol --targ $SUBJECTS_DIR/$subj/mri/norm.mgz \
            --m3z $SUBJECTS_DIR/$subj/cvs/combined_tocvs_avg35_elreg_afteraseg-norm.m3z \
            --noDefM3zPath --inv-morph \
            --mov $FREESURFER_HOME/subjects/cvs_avg35/mri/norm.mgz \
            --o temporary_volume.mgz \
            --interp trilin --no-save-reg

mri_vol2vol --targ temporary_volume.mgz \
            --reg $SUBJECTS_DIR/$subj/dtrecon/register.dat \
    --inv \
            --mov $SUBJECTS_DIR/$subj/dtrecon/lowb.nii \
            --o lowb.ANAT+CVS-to-avg35.mgz \
            --interp trilin --no-save-reg

Do the above commands look OK? I tried these commands, but the results were not great so I suspect that something is incorrect in the syntax and/or inputs.

Thanks for your help!

Doug

Douglas Merkitch
Neurological Sciences
Rush University Medical Center
Email: Douglas_Merkitch@rush.edu





On Jan 26, 2017, at 8:42 AM, Lilla Zollei <lzollei@nmr.mgh.harvard.edu>
 wrote:


Hi Doug,

In order to compute and apply the inverse of an m3z transform you would need to use the --inv-morph flag instead of the --m3z and reverse your targ and mov inputs. With the current implementation of mri_vol2vol though I do not think that you can specify the order of the transforms (which is important here), so you would need to apply the inverse non-linear trasform first and then the inverse rigid.

Lilla

On Wed, 25 Jan 2017, Douglas Merkitch wrote:

Hello Freesurfer experts,
>From your wiki page, I understand how to normalize volumes in subject diffusion space to the CVS template:
mri_vol2vol --targ $FREESURFER_HOME/subjects/cvs_avg35/mri/norm.mgz \
           --m3z $SUBJECTS_DIR/$subj/cvs/combined_tocvs_avg35_elreg_afteraseg-norm.m3z \
           --noDefM3zPath --reg $TUTORIAL_DIR/$subj/dtrecon/register.dat \
           --mov fa-masked.mgz \
           --o fa-masked.ANAT+CVS-to-avg35.mgz \
           --interp trilin --no-save-reg
However, how would one take take a volume in CVS template space and reverse normalize it back to subject diffusion space? Is this possible? If so, what would that command look like and what other st
eps would be necessary to get the required inputs?
Thanks,
Doug
Douglas Merkitch
Neurological Sciences
Rush University Medical Center
Email: Douglas_Merkitch@rush.edu
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