Hi,
if you look at the slides about spatial preprocessing, you'll see on
slide 68 the way without a T1 and on slide 69 the more elegant way
including the T1.
http://www.fil.ion.ucl.ac.uk/spm/course/slides10/
I would try both approaches on one subject and then decide whether it
is worth omitting the subjects without T1. I would assume not.
Best,
Eva
Am 18.08.2010 12:38, schrieb michel grothe:
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type="cite">
Hi
Rich,
>>So are you suggesting I co-register my mean functional image to
the EPI template, skip segmentation, then run 'Normalize:Estimate &
Write' with the EPI template file as the template image under the
Estimation options?
Yes, with the exception that you do not have to coregister the mean
functional to the EPI template as long as the origin (and orientation)
of your functionals does not differ too much from MNI-space (origin
close to the AC). You can check this with the 'Checkreg'-utility. You´d
then run 'Normalize:Estimate & Write' with the mean functional as
the source image (to estimate the transform to the EPI-template) and as
'images to write' you´d select all the realigned functionals for this
subject/session. This was the usual normalise procedure several years
ago and was replaced by the unified segmentation in SPM5. I didn´t know
it is possible to run unified segmentation directly on the functionals
as suggested by Eva.
Best,
Michel
> Subject: Re: [SPM] normalization without anatomy
> From: [log in to unmask]
> Date: Wed, 18 Aug 2010 11:11:24 +1000
> To: [log in to unmask]
>
> Hi Michel,
>
> Thanks for your help. I'm a bit of a beginner and have just been
following the SPM5 manual tutorial whereby I co-register my anatomical
image to the mean functional, segment the structural image and then use
the _sn.mat file generated as the parameter file to 'Normalize:Write'
the functional images. So are you suggesting I co-register my mean
functional image to the EPI template, skip segmentation, then run
'Normalize:Estimate & Write' with the EPI template file as the
template image under the Estimation options?
>
> I appreciate the help here . .
>
> Rich
>
>
> On 18/08/2010, at 10:51 AM, michel grothe wrote:
>
> > Hello Rich,
> > in this case you can (or have to) normalise the functionals
directly to the EPI-template provided by SPM using the old-fashioned
Normalise button. This procedure may be less acurate and is generally
not recommended anymore. However, I guess you´d then have to normalise
all your functionals this way to have consistent preprocessing on your
images. Don´t know if a more accurate spatial normalisation (unified
segmentation or DARTEL) would be worth omitting those 3 subjects...
> >
> > Hope this helps,
> > Michel
> >
> > > Date: Wed, 18 Aug 2010 09:55:35 +1000
> > > From: [log in to unmask]
> > > Subject: [SPM] normalization without anatomy
> > > To: [log in to unmask]
> > >
> > > Dear SPM List,
> > >
> > > We have collected functional and anatomical scans on 30
people in a study on emotional regulation, and I wish to preprocess the
functional images for a standard 2nd-level analysis as described in the
SPM manual. However it turns out we are missing the anatomical scans
for 3 people we would normally use in the coregistration, segmentation
and normalization steps. My question is it possible to normalize the
functional images from these 3 people without their anatomical scans?
> > >
> > > Ta,
> > >
> > > Rich
>
--
Mag. Dr. Eva-Maria Seidel
Research Associate
Department of Clinical, Biological, and Differential Psychology
Faculty of Psychology, University of Vienna
http://psychologie.univie.ac.at/klinische-psychologie
Liebiggasse 5, A-1010 Wien
T +43-1-4277-47895
F +43-1-4277-47899
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