Hi Manuel,
the 6 parameters refer to the translations and rotations along the three
principal axes, respectively. They fully describe the 3D trajectory
required to bring one image into the space of another one (although only
in their combination, you cannot look at either set in isolation). What
people usually do if they regress out 12 or 24 motion parameters is that
they take the original 6 and add modified versions, such as shifted
and/or squared versions.
There is a script to this effect at
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=SPM;3a4883eb.1503 (which
you will also find if you search the list archives ;) and you can find
some more information in https://www.ncbi.nlm.nih.gov/pubmed/25333359
and in https://www.ncbi.nlm.nih.gov/pubmed/22036679, as well as of
course in many other publications.
Cheers
Marko
Manuel wrote:
> Hi,
>
> In preprocessing, spm will produce rp file and I can use it as covariates of no interest to regress out .
> By default it contains 6 columns of data.
> I wonder if it would be better to regress out 12 motion parameters?
> And anyone know how to obtain the 12-column data? I appreciate for any help.
>
> Manuel
>
--
____________________________________________________
Prof. 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
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