Hi Yue
does the wm.mgz look incorrect also? If so, you can try setting seom expert
options to limit the lower range of the white matter.
cheers
Bruce
On Tue, 26 Nov 2013, Yue Cui wrote:
Hi Freesurfers:
I have processed images acquired from GE Sag 3D Bravo sequence, however, the
white surfaces are always messy and extend into gray matter (please see the
attached example). The CNR is not bad:
white = 96.0+-10.2, gray = 66.4+-18.0, csf = 38.1+-19.3
gray/white CNR = 2.053, gray/csf CNR = 1.149
lh CNR = 1.601
white = 95.8+-10.6, gray = 65.9+-18.4, csf = 36.4+-19.0
gray/white CNR = 1.985, gray/csf CNR = 1.246
rh CNR = 1.616
total CNR = 1.608
Bad white surface seems a sever problem for us, as it happens for every
subject. Is it a reason of low GM/WM contrast? Does anyone have an idea
about how to fix this kind of error?
Thanks so much.
Regards,
Yue
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