[Insight-users] Dicom and Image Spacing

[Bill Lorensen]

In ITK 3 and 4 we compute the distance between slice centers (spacing)
form the image position patient and orientation.
In ITKv4 there was a bug that was recently fixed. It will appear in
the 4.3 release. For now, you can try the latest 4.3 release candidate
which was announced recently on the mailing list.

On Thu, Dec 6, 2012 at 4:35 AM, Rômulo Pinho
<romulo.pinho at lyon.unicancer.fr> wrote:
> Hello, Alex
> It is indeed a change in GDCM 2.x. You can read about it at
>
> http://sourceforge.net/apps/mediawiki/gdcm/index.php?title=Using_GDCM_API#Automatic_ordering_of_slices_for_vtkGDCMImageReader.SetFileNames
>
> http://sourceforge.net/apps/mediawiki/gdcm/index.php?title=Imager_Pixel_Spacing#Spacing_along_Z_.28third_dimension.29
>
> http://sourceforge.net/apps/mediawiki/gdcm/index.php?title=Using_GDCM_API#Where_is_the_value_of_gdcm.Image.Spacing_coming_from_.3F
>
> Kind regards,
> Rômulo
>
>
>
> On 12/06/2012 10:16 AM, Alexander Schmidt-Richberg wrote:
>
> Hi,
>
> sorry if this has been discussed before. I'm sure I'm not the first to
> realize, but I couldn't find anything in the mailing lists.
>
> I have a problem with reading/writing volume images as Dicom files with
> ITKv4, presumably due to the change from GDCM 1.x to 2.x.
>
> In ITK 3, the image spacing was stored in the tags
> "SpacingBetweenSlices" and "ImagerPixelSpacing". In v4,
> "NominalScannedPixelSpacing" is used for the in-plane spacing, however,
> the z-spacing is not stored at all (if I'm right). That means, all of
> the "old" images I'm reading with ITK4 have a uniform spacing of 1,
> since the old tags are not interpreted. Moreover, programs like MeVisLab
> ignore the new tag.
>
> Has this behavior been discussed? Is it working as intended and is there
> any workaround?
>
> Best regards Alex
>
>
>
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