No ideas about the flat lines I'm afraid - unless all the images are
identical. Ensure that the file formats are all OK. If your data are
floating point or double precision, then maybe some NaNs could have crept in
for some reason. This may also stop the registration from working properly.
Best regards,
-John
> I have an intriguing error, when I run slice timing and realign, two things
> out of the ordinary occur, presumably related.
>
> Firstly no a####.mat files are generated,
>
>
>
> secondly the graphical output for realignment is "flatlined", that is the
> translation and rotation over all the images are 0 degrees and 0 mms.( a
> very unlikely event over 4 mins of scanning)
>
>
>
> I am getting this same output even if I run on different versions of
> Matlab, although I am using SPM2 on both.
>
>
>
> Looking at the raw data there does not seem to be any overt, excessive
> movement artifact, although I suppose an excessive gap in the images, might
> cause the aforementioned problems.
>
>
>
>
>
> Any help in insight would be greatly appreciated, the aforementioned
> problem seems to afflict three data sets, so it would be helpful if I could
> rule out an SPM problem, before I start looking elsewhere.
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