Thanks a lot!

Just want to make sure that the “RAS”(FS cords?) and “MNI Talairach” is the MNI305 coords.

发件人: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] 代表 Douglas Greve
发送时间: 2016年8月30日 21:21
收件人: freesurfer@nmr.mgh.harvard.edu
主题: Re: [Freesurfer] Questions about surface coordanates

tksurfer always uses the ?h.orig coordinates. Also keep in mind that the vertex index is 0-based whereas matlab is 1-based. When you click on a point, you should see something like the following print out

selected vertex 123491 out of 163842
current  -39.11  15.65  11.26
orig     -55.67 -10.37  19.95
pial       0.00   0.00   0.00
white    -55.76 -10.29  19.93

On 8/30/16 5:12 AM, Dongnandi wrote:

Dear Experts,

I tried to extract vertex coordinates information from ‘fsaverage/surf/lh.pial’ file using matlab function ‘read_surf’, but I found that the coordinates returned by the function are different from what I saw in tksurfer, here are the screenshots:

The vertex index starts from 0 in tksurfer, so I select the second elements in matlab. Why is the result different from what has been shown in tksurfer(also different in freeview)? Which one should I report?

Is there any way to transform the surface coordinates to the MNI152 space?

Thank you very much!

Dong

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