Hi Yune,
spm stores rotations in radians, but displays them in degrees. You will
have to convert between the two in order to recreate SPM's. This has
been discussed before on the list (see http://tinyurl.com/6motdh3 and
the link therein).
Cheers,
Marko
Yune Lee wrote:
> Dear SPM users,
>
> I noticed a puzzling discrepancy on the scale of motion parameters after
> I manually created a motion parameter plot using the txt file that SPM
> generated after realignment.
>
> In the attached files, S1_rotation_run1.pdf shows three rotation
> profiles on the first run of a subject and spm_out.pdf is what SPM
> typically gives us after realignment is doe.
> As can be seen, the rotation range is -1 to -0.4 (see bottom plot of
> the SPM plot ) and -0.01 to 0.004 (manual plot). Does anybody have idea
> why the scale is different between those two?
>
> Thanks in advance,
> YSL
>
>
--
____________________________________________________
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
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http://www.medizin.uni-tuebingen.de/kinder/epn
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