Hi,
I have only looked at this once (yesterday) but I am pretty sure you
want to enter the time difference between scans. This needs to be
provided so that spm can give you a "rate of change" image if you want to.
Cheers,
Marko
Mouthon Michaël wrote:
> Dear SPM community,
> I have a basic question regarding VBM analysis with the new "longitudinal registration" procedure of spm12b.
>
> I would like to compare volumetric difference after a training procedure (pairwise registration between two time point). Each subject perform a 14 days of training. The time between to scans vary for each participant due to scanner availability (e.g 27, 20, 15, ... days).
>
> In the longitudinal registration batch, which duration should I enter in the "Time Difference" ? The duration of the training (which are the same for every one) or the actual time between difference between two scans (different for each subject) ?
>
> Thanks
>
--
____________________________________________________
PD Dr. med. Marko Wilke
Facharzt für Kinder- und Jugendmedizin
Leiter, Experimentelle Pädiatrische Neurobildgebung
Universitäts-Kinderklinik
Abt. III (Neuropädiatrie)
Marko Wilke, MD, PhD
Pediatrician
Head, Experimental Pediatric Neuroimaging
University Children's Hospital
Dept. III (Pediatric Neurology)
Hoppe-Seyler-Str. 1
D - 72076 Tübingen, Germany
Tel. +49 7071 29-83416
Fax +49 7071 29-5473
[log in to unmask]
http://www.medizin.uni-tuebingen.de/kinder/epn/
____________________________________________________
|