Hi Sita,
Thanks for your reply.
A follow up question I have and that is so how about measurements in
mris_anatomical_stats? Wouldn't total WM volume be affected by an
inaccurate wm.mgz or does freesurfer use surfaces to compute the
volumes?
Thank you,
Nasim
On Mar 3, 2009, at 6:26 PM, Sita Kakunoori wrote:
Hi Nasim,
1-Will I get accurate results if I do the edits (erasing
misclassified
white
matter in wm.mgz) to my white matter mask only in those 10% areas
that
the wm
surface is not accurate or should I correct the wm.mgz 'every
where' no
matter what?
You can just make edits in the problem areas and run recon-all. That
should fix the errors and give you accurate results.
2- Will you necessarily get more accurate results by editing your
wm.mgz
where pixels are classified as white by mistake BUT your final white
matter
surface is accurate?
No. You don't have to edit wm.mgz if the white surface is accurate.
3-How much on average takes you to do the manual white matter edits
for
each
of your subjects?!
It really varies from scan to scan and mostly will depend on the
quality
of the scan acquired. For a good scan, it'll probably take an hour or
less.
Sita.
On Tue, 3 Mar 2009, Nasim Maleki wrote:
Dear Freesurfers,
I have a question on manual white matter edits:
I have cases where a considerable amount of gray matter is
classified as white in my wm.mgz and therefore the original surface
(green) is not accurate but then that is fixed in the next steps
and the wm surface (yellow) is accurate in 90% of the areas but not
accurate in other 10% .
Now my questions are:
1-Will I get accurate results if I do the edits (erasing
misclassified white matter in wm.mgz) to my white matter mask only
in those 10% areas that the wm surface is not accurate or should I
correct the wm.mgz 'every where' no matter what?
2- Will you necessarily get more accurate results by editing your
wm.mgz where pixels are classified as white by mistake BUT your
final white matter surface is accurate?
3-How much on average takes you to do the manual white matter edits
for each of your subjects?!
Thank you,
Nasim
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