Dear Randolph,
I'm afraid when we did this we did it to individual frames, too. Maybe
you can script this to be ready before this year's Christmas?
Have you thought of another much more pain-free option - work in PET
space and coregister the MRI to your summed PET image?
Good luck & hope this helps,
Alexander
PS: Incidentally, you should normally weigh your frames for your summed
image depending on frame length and number of events - but for a simple
task like co-registration your simple sum will work for most tracers
with any cortical signal at all.
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]]
On Behalf Of Randolph Andrews
Sent: 08 December 2008 21:03
To: [log in to unmask]
Subject: [SPM] Coregistration (reslice only?) of multiframe image after
summed-frame image works OK
I'm very used to working with static images (FDG using SPM96, SPM99,
SPM2)
but I now need to coregister dynamic images (21 frames) to a subject's
MRI.
The early frames don't have a whole lot of information, so I've summed
all
frames into a sngle image, and the coregistration works just fine on
that.
I originally thought I could coregister and reslice the summed image and
when
the GUI prompted for "other images", I'd just select the dynamic image
and
SPM would use the transform obtained from the first coregistation and
reslice
all 21 frames of 2nd image.
It appears to only reslice the 1st frame of the dynamic image (not a
whole lot
of use by itself). I've seen some earlier posts (4D image) that
suggeted I
parse the dynamic image frame-by-frame, but I have 96 of these, and I'd
like
to get this coregistration step done before Christmas (of next year).
Using "Reslice Only" prompts me to select "Space defining image, subj
1". I've
tried both the r(summed image) and the MRI, and I still only get the 1st
frame.
Help?
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