If you just want to resample the ROI to the average subject, then use mri_vol2surf, something like

mri_vol2surf --mov V1.nii --regheader --s SubjectX --hemi lh --projfrac 0.5 --trgsubject fsaverage --o lh.v1.fsa.mgh

syntax might not be exactly right, check the help

doug

Holly Bridge wrote:

I am trying to register an anatomical ROI (V1Left.nii.gz) in the same volume space as brain.mgz for SubjectX using spherical registration to the average subject brain. I have used the following command

mris_preproc --s SubjectX --out ~/SubjectX/lh.ave.v1.mgz --target average --hemi lh --ivp ~/SubjectX/V1Left.nii.gz ~/SubjectX/mri/transforms/identity.xfm

and received this output:

nsubjects = 4 ERROR: number of input volumes (1) does not equal number of subjects

From where does the code read nsubjects = 4?

Thanks for the help,

Holly Bridge

If required, identity.xfm contains the following

MNI Transform File % tkregister2

Transform_Type = Linear; Linear_Transform = 1.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.00000000 0.00000000 ;

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Dr Holly Bridge

Royal Society University Research Fellow

FMRIB Centre Tel: +44-1865-222582

John Radcliffe Hospital

Headington

Oxford OX3 9DU Email: hb@fmrib.ox.ac.uk mailto:hb@fmrib.ox.ac.uk

Lecturer and JRF, New College

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