Hi Minjie,<div><br></div><div>You&#39;ll want to give tksurfer the name of one of the &quot;regular&quot; surfaces (e.g., inflated, pial, etc.) as the third positional argument and then view your FA file as an overlay ( -overlay rh.fa.vol2surf2.w ).  The former gives the surface geometry information (where the vertices are and which are connected in the mesh) while the latter gives an arbitrary scalar value associated with each vertex (in your case, FA).</div>

<div><br></div><div>Best,</div><div>Michael<br><div><br><div class="gmail_quote">On Wed, Dec 21, 2011 at 11:39 AM, Minjie Wu <span dir="ltr">&lt;<a href="mailto:minjiewu@gmail.com">minjiewu@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Surfer,<br>
<br>
I was trying to project a DTI FA image onto the T1 WM surface (for<br>
now), and eventually into the fsaverage as in a recent paper: Phillips<br>
OR, Nuechterlein KH, Asarnow RF, Clark KA, Cabeen R, Yang Y, et al.<br>
Mapping corticocortical structural integrity in schizophrenia and<br>
effects of genetic liability. Biological psychiatry. 2011;70(7):680-9.<br>
<br>
1. align the lowb.nii.gz from DTI data to T1.mgz image using<br>
bbregister to create the register.dat file.<br>
bbregister --s 20808 --mov lowb.nii.gz --reg lowb2orig.dat --dti --init-fsl<br>
<br>
2. project FA into surface space<br>
mri_vol2surf --mov dtifit_FA.nii.gz --reg lowb2orig.dat --hemi rh --o<br>
rh.fa.vol2surf2.w --projfrac 0 --interp nearest --surf white<br>
--out_type paint<br>
<br>
Here is the error message when I tried to check the surface in subject T1 space<br>
<br>
[Minjie-Wus-Mac-Pro:subjects/20808/dmri] minjiewu% tksurfer 20808 rh<br>
fa.vol2surf2.w<br>
subject is 20808<br>
hemi    is rh<br>
surface is fa.vol2surf2.w<br>
surfer: current subjects dir: /Volumes/Lion/projects/surface/subjects<br>
surfer: not in &quot;scripts&quot; dir ==&gt; using cwd for session root<br>
surfer: session root data dir ($session) set to:<br>
surfer:     /Volumes/Lion/projects/surface/subjects/20808/dmri<br>
checking for nofix files in &#39;fa.vol2surf2.w&#39;<br>
Reading image info (/Volumes/Lion/projects/surface/subjects/20808)<br>
Reading /Volumes/Lion/projects/surface/subjects/20808/mri/orig.mgz<br>
surfer: Reading header info from<br>
/Volumes/Lion/projects/surface/subjects/20808/mri/orig.mgz<br>
nquads=14348288,  nvertices=1<br>
ERROR: MRISread: file<br>
&#39;/Volumes/Lion/projects/surface/subjects/20808/surf/rh.fa.vol2surf2.w&#39;<br>
has many more faces than vertices!<br>
Probably trying to use a scalar data file as a surfa<br>
<br>
<br>
Thank you very much for your help.<br>
<br>
Minjie<br>
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</blockquote></div><br></div></div>