Hi Ines,

use the mgh route. The "vol" is actually the vector of thickness values, with one entry per vertex on the surface.

cheers, Bruce On Tue, 31 Jul 2007, Inês Souta wrote:

Hello,

I was trying to create a cortical thickness map with constant values in order to perform some tests. At first I tried using mris_convert. I converted my thickness file into ascii:

mris_convert lh.thickness lh.thickess.asc

then I used matlab to change all the values in the last column to 2,0. I tried to convert the ascii file back to surface file by doing

mris_convert lh.thicness.asc lh.thickness

but I got "Segmentation fault". How can I convert may ascii file into a surface one?

After failling to acomplish this, I tried using the save_mgh and load_mgh file, nevertheless I'm not quite sure which input values are needed. Where can I put my fake values in the save_mgh file? And what is "vol"?

Thanks,

Ines

Inês,

Alternatively, the usage of mris_convert that you want is:

mris_convert -c lh.thickness lh.white lh.thickness.asc

then, after altering the .asc file, to convert back:

mris_convert -c lh.thickness.asc lh.white lh.thickness

See mris_convert --help. The surface file is needed so as it has something to load into (you can use lh.inflated, or lh.pial, it doesnt matter).

Nick

On Tue, 2007-07-31 at 12:18 +0100, Inês Souta wrote:

Hello,

I was trying to create a cortical thickness map with constant values in order to perform some tests. At first I tried using mris_convert. I converted my thickness file into ascii:

mris_convert lh.thickness lh.thickess.asc

then I used matlab to change all the values in the last column to 2,0. I tried to convert the ascii file back to surface file by doing

mris_convert lh.thicness.asc lh.thickness

but I got "Segmentation fault". How can I convert may ascii file into a surface one?

After failling to acomplish this, I tried using the save_mgh and load_mgh file, nevertheless I'm not quite sure which input values are needed. Where can I put my fake values in the save_mgh file? And what is "vol"?

Thanks,

Ines _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer