Dear Torsten,
First of all, are are sure that the labels are all correct?
This is especially important for the left and right labels, which
you can check ideally by looking at a marker like a vitamin
capsule that was taped to the head during scanning, or if
that was not done then compare the anatomy *very*
carefully with the structural scan - assuming
that you are sure the structural scan is correct.
If these labels are fine for all images then it doesn't
matter what the voxel coordinates are. If the labels
are correct then everything else will also be correct
and you don't have to worry about the coordinates. The
crucial thing, if you haven't guessed so far, is the *labels*!
All the best,
Mark
On 21 Jul 2011, at 10:29, Torsten Ruest wrote:
> Hi there,
>
> I am continuing to process data that has already been preprocessed up to a certain level. I am using MRIConvert to convert from dicom to nifti, whereas previous work appears to have been done with dinifti. I noticed that, for instance, fieldmap (MRIConvert) and functional data (dinifti) are displayed correctly (left-right etc), and when opened in fslview stanza, they are aligned. However I noticed that for the voxel coordinate x = 0, the crosshair for the functional data is at the left (x = - 112.84 mm), while for the fieldmap at voxel coordinate x=0, it is at the right (x = 100.16 mm).
>
> While the orientations seems to be identical, the coordinate reference system appears different. I couldn't find information on this behaviour, so I was wondering whether this constitutes any problem for following analyses (the images register alright).
>
> Thanks very much in advance,
>
> Torsten
>
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