Hi,<br><br>I am 
trying to extract the pial surface for one of my subjects using 
freesurfer. Unfortunately, the last couple times that I ran recon-all, 
it generated a surface that was overly smoothed. I suspect this is due 
to a poor contrast in my MRI images. I tried to edit them via matlab and
 run them again. First, I got a talairach transform error and when I 
re-ran it with the -notal-check flag, I got a global region empty error.
 I was wondering if there is a way to enhance the mri images in 
freesurfer to obtain better contrast for a more accurate pial surface. 
Please let me know what is the best way to tackle this problem. <br>
<br>I do not think it&#39;s the version of freesurfer, because the pial surface was created fine for some of the other subjects.<br><br>Thank you,<br>YP