Andy,
you are doing realignment as you should. However, the graph gets you the
realignment parameters over all sessions, while you are interested in
the realignment parameters per session. For this, see the rp_... text
file in each directory.
Hope this helps,
Marko
Andy Yeung wrote:
> Dear Marko and everyone,
>
> Thanks Marko for your reply! I'm doing realignment step as follows:
> After clicking realignment, I create 2 sessions, and I input files
> accordingly, save job, run.
> The resultant graphs (translation and rotation) consist of both sessions.
> So when I click data statistics and find the max, min, mean, max
> difference etc, they are affected by between session 'jump'.
>
> Should I interpret head movement statistics by separating the 2 sessions
> and run realignment steps separately?
>
> Best,
> Andy
>
>
> On Mon, Dec 2, 2013 at 4:48 PM, Marko Wilke
> <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
> Andy,
>
> as Chris said, motion in between sessions is a completely different
> issue from motion within sessions, and spm handles it as such.
> Hence, the realignment parameters are saved for each individual run,
> and do not contain the "jump" between sessions. If you want to check
> the realignment parameters for each session, look at the text file
> saved in each session's directory, and/or use the code snippet found
> at
> https://www.jiscmail.ac.uk/__cgi-bin/webadmin?A2=SPM;__8b7c5540.1102
> <https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=SPM;8b7c5540.1102>
>
> Cheers,
> Marko
>
> Andy Yeung wrote:
>
>
>
> ---------- Forwarded message ----------
> From: *Andy Yeung* <[log in to unmask]
> <mailto:[log in to unmask]> <mailto:[log in to unmask]
> <mailto:[log in to unmask]>__>>
> Date: Mon, Dec 2, 2013 at 4:31 PM
> Subject: Re: [SPM] Head movement calculation
> To: "Watson, Christopher"
> <[log in to unmask]
> <mailto:[log in to unmask]>
> <mailto:[log in to unmask]
> <mailto:[log in to unmask]>>>
>
>
> Thanks Christopher, but some subjects got a sudden jump of 5-7mm in
> translation when they went from session 1 to session 2. I would
> like to
> find a way to exclude them during reporting head movement
> values. Are
> there ways?
>
> Still need help.
>
> Andy
>
>
> On Sat, Nov 30, 2013 at 12:02 PM, Watson, Christopher
> <[log in to unmask]
> <mailto:[log in to unmask]>
> <mailto:[log in to unmask]
> <mailto:[log in to unmask]>>> wrote:
>
> Movement in between sessions shouldn't be a problem
> (assuming the 2
> sessions weren't acquired on separate days).
>
> __________________________________________
> From: SPM (Statistical Parametric Mapping)
> [[log in to unmask] <mailto:[log in to unmask]>
> <mailto:[log in to unmask] <mailto:[log in to unmask]>>] on
> behalf of Andy Yeung
> [[log in to unmask] <mailto:[log in to unmask]>
> <mailto:[log in to unmask] <mailto:[log in to unmask]>__>]
>
> Sent: Friday, November 29, 2013 10:45 PM
> To: [log in to unmask] <mailto:[log in to unmask]>
> <mailto:[log in to unmask] <mailto:[log in to unmask]>>
>
> Subject: [SPM] Head movement calculation
>
> Hi everyone,
>
> My experiment consists of 2 sessions.
> I suppose for realignment step I should input the data
> files into 2
> sessions right?
>
> I want to exclude the single huge movement in between
> sessions when
> I extract info from Data Statistics. How to do so?
>
> Also, do you guys normally quote [max-min] as the movement
> or just
> either [max-0] or [min-0]?
>
> Thanks.
>
> Andy
>
>
>
>
> --
> ______________________________________________________
> 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 <tel:%2B49%207071%2029-83416>
> Fax +49 7071 29-5473 <tel:%2B49%207071%2029-5473>
> [log in to unmask]
> <mailto:[log in to unmask]>
>
> http://www.medizin.uni-__tuebingen.de/kinder/epn/
> <http://www.medizin.uni-tuebingen.de/kinder/epn/>
> ______________________________________________________
>
>
--
____________________________________________________
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/
____________________________________________________
|