DARTEL typically produces a smaller template compared to the T1
canonical brain in MNI. In SPM8, you should select the option to warp
to MNI space as well. If your using SPM5, there is a program under
resources at brainmap.wisc.edu to warp to MNI space.
If you selected the warp to MNI space, I am surprised with the misregistration.
On Monday, February 14, 2011, justine dupont <[log in to unmask]> wrote:
> Dear experts
> I have run a DARTEL analysis and comparing the DARTEL template and the regular T1 canonical brain I get the result attached. I was surprised that the two images are so different in shape. My sample is 45 young healthy adults, roughly equal numbers of males and females. Eyeballing the original scans there are no 'outliers' or anomalies. Likewise there were no obvious anomalies looking at the various stages of preprocessing.
> So I am not sure whether something has gone wrong, or whether my sample, for some reason, had genuinely small brains, compared to the canonical T1, or perhaps whether there is some other explanation.
> Thank you
Best Regards, Donald McLaren
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
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