> thanks for your advise!
> I reset the origin in hdr edit,
> and the bound box in normalize default
> but it doesn't work.
Use the Check-reg button to ensure that your data are initially
not too far apart.
> Now it is not black after normalize an image
> which follows I set the default normalize not to mask brain.
> I'll try the other images.
> If this is work, can you tell me why?
You will need to change the various default settings suggested in the
previous emails. The main reason for this is that the brains you are
working with are much smaller than the human brains that SPM was
designed for. If you are trying to use SPM99 for this, then there
may be many modifications needed by the spm routines. If you are
trying SPM2b, then you may need to try various different values for
the default settings.
Disabling brain masking would be done because it would make no sense
to use a human brain mask in order to spatially normalise a rat brain.
Best of luck,
-John
> ======= 2003-04-24 14:17:00 您在来信中写道:=======
>
> >> I met a difficult (to me) question.
> >> I dealt some rats' fmri images with SPM these days, after realign
> >> I did normalize, use a template which is made by some rats'
> >> mean image (also the results of realign),
> >> but the rulsts are too bad, some is black, and the others
> >> are departure from the origin template.
> >> And I want to know what's the matter.
> >
> >If you are using SPM2b, then this is relatively easy to fix. For SPM99,
> >the following may help a little. It relates to warping brains that are
> >rather smaller than your rat brains, but the same principles still apply:
> >
> >http://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=ind0204&L=spm&P=R13068&I=-1
> >http://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=ind0206&L=spm&P=R9773&I=-1
> >
> >For SPM2b, I would suggest tweeking your defaults. The following relates
> >to possible tweeks for monkey images....
> >http://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=ind0303&L=spm&P=R984&I=-1
> >
> >You may wish to tweek the values slightly more for rat brains.
>
> = = = = = = = = = = = = = = = = = = = =
--
Dr John Ashburner.
Functional Imaging Lab., 12 Queen Square, London WC1N 3BG, UK.
tel: +44 (0)20 78337491 or +44 (0)20 78373611 x4381
fax: +44 (0)20 78131420 http://www.fil.ion.ucl.ac.uk/~john
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