Hi EK
make sure that you don't have any control points in any voxels that contain any GM. It looks like maybe you do in the region where you drew a red arrow, although it's impossible to tell for sure from those images.
cheers Bruce
On Tue, 25 Sep 2012, EK Kim wrote:
Dear all expert, Hello, I have been trying to solve this WM/GM boundary error. The data I attached here have a lots of problems, especially WM/GM boundary was not detected in temporal areas. Using mri_cnr function, I calculated the gray/white CNR of the norm.mgz.
norm.mgz
white = 97.3+-10.3, gray = 77.3+-14.8, csf = 55.6+-19.5 gray/white CNR = 1.222, gray/csf CNR = 0.790 lh CNR = 1.006
white = 97.0+-11.2, gray = 76.9+-15.1, csf = 55.9+-19.3 gray/white CNR = 1.139, gray/csf CNR = 0.737 rh CNR = 0.938 total CNR = 0.972
- Does the low CNR affect the bad tissue segmentation results?
How can I solve the problem? Is there a way to improve the low CNR value?
- How can I delete the continuous areas, indicated by red arrow (axial,
134)?
I use freesurfer-Darwin-leopard-i686-stable-pub-v5.1.0.
Thank you for any comments or replies in advance.
Best,
EK