Dear Mark,
Where did you get them, and how did you convert them to a format that SPM can
(try to) read? They have probably been converted using some software that
puts information in the same place in the header as the ORIGIN field used by
SPM. One possibility is that they are NIFTI-1 (which SPM2 doesn't recognise
- but SPM5 will).
Best regards,
-John
> I have some (less than ideal) MRI structural images that I want to
> co-register with PET data. When I display them in SPM2 it is reporting
> the following:
>
> Dimensions: 512x512x130 (correct)
> Datatype: int16 (correct)
> Intensity: Y=1X (correct)
>
> Vox size: -0.449 x 0.449 x 1.39 (correct)
> Origin: 1.8e+04 1.77e+04 1.72e+04 (strange)
> Dir Cos: 1.000 0.000 0.000
> 0.000 0.540 -0.841
> 0.000 0.841 0.540
>
> The images were acquired approximately coronally, so I re-orient by a
> ptich rotation of approx -pi/2 before I did this display.
> If I click on the image and get the crossharis to about were I would
> like the origin to be the display window reports the crosshair position as:
>
> mm: 7973.1 15786.8 -19443.1
> vx: 253.2 309.1 60.0
>
> It seems to me that SPM2 is not handling the voxel to world translation
> correctly. Can anyone help?
>
> Many thanks,
>
> Mark
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