Hi Dave,
Indeed the voxel time series show the expected signal fluctuations. So
there is a mismatch of seeing intensities fluctuations in the voxel time
series plots, but a frozen still image of the brain, where no changes
are visible by eye, even when playing with the contrast levels.
This was not only a single case where I noticed it, but in every
filtered image. And it does not matter, whether I filter ICs, or motion
parameter.
So maybe it is worth to have a look into the data.
cheers,
wolf
Dave Flitney wrote:
> On 29 Jun 2008, at 15:14, wolf zinke wrote:
>
>> .5) After filtering the data, There is no motion visible when using
>> the movie loop with fslview. I am pretty impressed by this effect,
>> since I have data dominated by artefacts. Is fsl_regfilt really that
>> effective or is this just a bug in fslview causing only one volume
>> being displayed?
>
>
> I am unaware of such a bug. If you can see no difference, ie., all
> corresponding voxels displayed in each frame are identical in value,
> then I would be concerned; for any images I have looked at it is
> obvious that fslview is displaying different volumes (registered or
> not). If this is not the case then I should like to take a look at
> your image.
>
> Cheers, Dave
>
> --
> Dave Flitney, IT Manager
> Oxford Centre for Functional MRI of the Brain
> E:[log in to unmask] W:+44-1865-222713 F:+44-1865-222717
> URL: http://www.fmrib.ox.ac.uk/~flitney
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