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
----------------------------------
1. 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?
2. 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
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