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Are you sure you
applied the reorient changes to all images?
How much did the movement parameters change?
If you are going to add as regressors, add all 6.
On 06/13/2013 11:54 AM, Stefan
Greulich wrote:
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all,
I have run into a strange behaviour of SPM and might need some
help. I am a master student and run a fMRI study, and on one
subject I had to us the reorientate procedure to reset the point
of origin into the AC. This was necessary, to get usable results
from the segmentation process. But when I applied the
reorientation to all the EPIs of the subject, the movement
parameters, which are estimated by the realigment module
changes. As it is my understanding, that the realignment
procedure only gives you relative movements (in my case to the
first EPI), how is this possible?
The reorientation happens in the y and z axis and the change
affects all translation parameters, but not the rotation
parameters.
I also would like to now, which one of the movement parameters
should I use for ascertaining the subject movement and as
regressors in the analysis?
Many Thanks in advance,
Stefan Greulich