Hi freesurfer community,

We are checking to see the accuracy of our subjects’ white and gray matter parcellation. We have found that for some subjects the contour lines for white matter surface and pial surface are somewhat inaccurate, and have been making modifications using the tutorials.

Specifically, we made changes to the white matter wm.mgz file; this however did not alter the contour lines. We also used control points, and were able to see changes to the white matter surface contour lines using this approach.

How do you recommend that we proceed to obtain the most accurate results? Should we continue making changes to the wm.mgz file as well as adding control points, or is it sufficient just to add control points?