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Hi Youngbin,
It’s difficult to say what is happening. Is it only a
problem with this one subject, while segments of other subjects are fine?
I find that if the head is tilted it doesn’t matter as long as the AC is set
as the origin prior to segmenting. I have no idea if this is the problem,
but it’s all I can think to suggest:
When you Display the structural scan and go to coordinate (mm) 0
0 0 the crosshairs should land on the AC. If it does not, you can adjust
the “right” “forward” “up” in the lower
left of the Display and then “Reorient image” to make the AC the
origin. Carlton Chu posted a script to do this automatically if you have
a lot of images (auto_reorient.m).
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0810&L=SPM&P=R35554
-Dana
From: SPM (Statistical
Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Youngbin
Kwak
Sent: Sunday, May 03, 2009 4:53 PM
To: [log in to unmask]
Subject: [SPM] SPM5 segmentation
Hi all,
One of my subject's head position in the high
resolution structural scan is not quite parallel to the AC-PC line (he lifted
his chin up), and I think this causes problems such as when using
segmentation. Even after coregistering it to his functional
scans which are relatively well positioned, using segmenation option
in SPM5 does not give any results for gray and white matter. Can someone
help me out solve this issue?
Thanks!
Youngbin