Thank you Bruce,

I convert the fsaverage flat map into a ascii file, using: mris_convert -p lh.cortex.patch.flat lh.cortex.patch.flat.asc.

Now I need to read these two files.

(1) I used read_patch.m to read lh.cortex.patch.flat. But an error came out, it said ‘ Error using ==> read_patch at 28, could not open file …’.

(2) I couldn’t find a read_patch_asc.m script in Freesurfer, as is suggested in https://www.mail-archive.com/freesurfer%40nmr.mgh.harvard.edu/msg35813.html

(3) I found a read_asc.m instead, but when I used it to read the lh.cortex.patch.flat.asc, an error occurred: ‘Error using ==> fgets, Invalid file identifier. Use open to generate a valid file identifier’.

Could you please give me some advices?Thank you very much!

Best regards,

Qiongmin

————————————————Original email---------------------------------------

Hi Qiongmin

1. I think this is a bug in the open GL code that is outside of our
control. We will try to track it down

2. The flat maps aren't really any different than say the inflated
fsaverage surface. If you can generate group (or individual maps) in
fsaverage space you can display them on the flat maps.

3. The index of each vertex in the flattened space is stored in the patch
files so you can always look up what vertex it was on inflated, sphere,
etc...

cheers
Bruce

On Mon, 26 May 2014, Caka
wrote:

Dear Bruce, Doug and all,
Thanks for your suggestion, it helped a lot.

(1) I load the fsaverage surface (lh.inflated) in tksurfer, and then load
the fsaverage patch (lh.cortex.patch.flat). The flat map was shown for
several seconds, and then ?an error occurred and tksurfer was shut down. The
terminal said: ?tksurfer.bin:tnl/t_vertex.c:407: update_input_ptrs:
Assertion ?a[j].inputstride == vptr-> stride? failed. Abort(core dumped)?.
?Could you give me some advice?
I use a 'CentOS release 6.2' system. The freesurfer is
?freesurfer-Linux-centos6_x86_64-stable-pub-v5.3.0?.?

(2) Indeed, I want to flatten all cortical thickness surfaces of 140
subjects onto the ?lh.cortex.patch.flat? of fsaverage. I just don?t
understand your idea how to do this. After I load ?lh.cortex.patch.flat? of
fsaverage, the tksurfer only shows this flat map (now it lasted for several
seconds and crashed), so how can I ' load whatever overlay you want in the
same way you would on the inflated surface??
Does it mean that I load the individual flat map on the individual inflated
surface? But I haven?t got the individual flat map yet.?

(3) I am wondering if there are some table recording the transformation
relationships between the fsaverage surface vertices and the flat map
vertices? If so, then I think all I need to do is extracting the cortical
thickness value of every vertex in individual inflated surface, and then
putting into the corresponding vertex in the flat map.?

Thank you very much!?

Best regards,
Qiongmin?